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Displaying Results 101 - 125 of 2992 on page 5 of 120
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Redox switching and oxygen evolution electrocatalysis in polymeric iron oxyhydroxide films
(2009)
LYONS, MICHAEL EDWARD
Redox switching and oxygen evolution electrocatalysis in polymeric iron oxyhydroxide films
(2009)
LYONS, MICHAEL EDWARD
Abstract:
peer-reviewed
Outstanding issues regarding the redox switching characteristics and the oxygen evolution reaction (OER) electrocatalytic behaviour of multicycled iron oxyhydroxide films in aqueous alkaline solution have been examined. Charge percolation through the hydrous layer has been quantified, using cyclic voltammetry, in terms of a charge transport diffusion coefficient DCT which admits a value of ca. 3 ? 10-10 cm2 s-1. Steady-state Tafel plot analysis and electrochemical impedance spectroscopy have been used to elucidate the kinetics and mechanism of oxygen evolution. Tafel slope values of ca. 60 mV dec-1 and ca. 120 mV dec-1 are found at low and high overpotentials respectively, whereas the reaction order with respect to hydroxide ion activity changes from ca. 3/2 to ca. 1 as the potential is increased. These observations are rationalised in terms of a kinetic scheme involving Temkin adsorption and the rate determining formation of a physisorbed hydrogen peroxide interme...
http://hdl.handle.net/2262/33790
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Understanding the p-Type Conduction Properties of the Transparent Conducting Oxide CuBO2: A Density Functional Theory Analysis
(2009)
WATSON, GRAEME; SCANLON, DAVID
Understanding the p-Type Conduction Properties of the Transparent Conducting Oxide CuBO2: A Density Functional Theory Analysis
(2009)
WATSON, GRAEME; SCANLON, DAVID
Abstract:
CuCrO2 is the most promising Cu-based delafossite for p-type optoelectronic devices. Despite this, little is known about the p-type conduction mechanism of this material, with both CuI/CuII and CrIII/CrIV hole mechanisms being proposed. In this article we examine the electronic structure, thermodynamic stability and the p-type defect chemistry of this ternary compound using density functional theory with three different approaches to the exchange and correlation; the generalized-gradient-approximation of Perdew, Burke and Ernzerhof (PBE), PBE with an additional correction for on-site Coulombic interactions (PBE + U) and the nonlocal, screened-exchange hybrid functional HSE06. The fundamental band gap of CuCrO2 is demonstrated to be indirect in nature. Under all growth conditions, the dominant intrinsic p-type defect will be the Cu vacancy, with hole formation centered solely on the Cu sublattice. Mg doping is found to be significantly lower in energy than intrinsic defect formation,...
http://hdl.handle.net/2262/62905
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Smart polymer surfaces: mapping chemical landscapes on the nanometre scale
(2010)
KOPF, ILONA
Smart polymer surfaces: mapping chemical landscapes on the nanometre scale
(2010)
KOPF, ILONA
Abstract:
We show that Scattering Infrared Near-field Microscopy (SNIM) allows chemical mapping of polymer monolayers that can serve as designed nanostructured surfaces with specific surface chemistry properties on a nm scale. Using s-SNIM a minimum volume of 100 nm 100 nm 15 nm is sufficient for a recording of a ``chemical?? IR signature which corresponds to an enhancement of at least four orders of magnitudes compared to conventional FT-IR microscopy. We could prove that even in cases where it is essentially difficult to distinguish between distinct polymer compositions based solely on topography, nanophase separated polymers can be clearly distinguished according to their characteristic near-field IR response.
http://hdl.handle.net/2262/56529
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Orientational/translational relaxation in aqueous electrolyte solutions : a molecular model for microwave/far-infrared ranges
(2001)
VIJ, JAGDISH KUMAR
Orientational/translational relaxation in aqueous electrolyte solutions : a molecular model for microwave/far-infrared ranges
(2001)
VIJ, JAGDISH KUMAR
Abstract:
A model is given where the complex permittivity of an electrolyte solution is calculated as a superposition of the contributions due to the translation of ions and the reorientation of water molecules, which occur in intermolecular potential wells during the lifetime of local order in liquids. Simple analytical expressions are found for the contributions of cations and anions to the linear-response spectral function. The one-dimensional rectangular potential well with perfectly elastic walls is considered. The contribution of water molecules to the orientational relaxation was calculated in terms of a hybrid model using the approach given recently in a book by Gaiduk (Dielectric Relaxation and Dynamics of Polar Molecules, World Scientific, Singapore, 1999). A modification of this model is also suggested in which the walls of the potential well undergo rather slow vibration. If the angular frequency is much less than the plasma frequency p of an ion, then the theory yields a nearly ...
http://hdl.handle.net/2262/40307
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Orthogonal modification of polymer chain-ends via sequential nitrile oxide–alkyne and azide–alkyne Huisgen cycloadditions
(2011)
Singh, Ishwar ; Zarafshani, Zoya; Heaney, Frances; Lutz, Jean-François
Orthogonal modification of polymer chain-ends via sequential nitrile oxide–alkyne and azide–alkyne Huisgen cycloadditions
(2011)
Singh, Ishwar ; Zarafshani, Zoya; Heaney, Frances; Lutz, Jean-François
Abstract:
The α- and ω-chain-ends of well-defined polystyrene chains were functionalized using consecutive Huisgen cycloadditions. Firstly, an α-alkyne, ω-azido heterotelechelic polystyrene precursor was synthesized in three steps: (i) atom transfer radical polymerization in the presence of (1,1,1-trimethylsilyl)-2-propynyl 2-bromo-2-isobutyrate, (ii) deprotection of the alkyne function of the initiator and (iii) nucleophilic substitution of the bromine chain-end of the polymer with sodium azide. Afterwards, the chain-ends of the polymer were modified by successive nitrile oxide–alkyne cycloaddition (NOAC) and copper-catalyzed azide–alkyne cycloaddition (CuAAC). 2 Model building blocks were tested for NOAC, while 4 building blocks were studied for CuAAC. In all cases, the orthogonal combination of NOAC and CuAAC allowed the preparation of tailored heterotelechelic polymers.
http://eprints.maynoothuniversity.ie/4296/
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Nucleoside and nucleotide analogues by catalyst free Huisgen nitrile oxide–alkyne 1,3-dipolar cycloaddition
(2010)
Algay, Virginie; Singh, Ishwar ; Heaney, Frances
Nucleoside and nucleotide analogues by catalyst free Huisgen nitrile oxide–alkyne 1,3-dipolar cycloaddition
(2010)
Algay, Virginie; Singh, Ishwar ; Heaney, Frances
Abstract:
An efficient, catalyst free, 1,3-dipolar cycloaddition strategy to conjugate nucleosides and nucleotides with isoxazoles under atmospheric conditions and in an aqueous environment is reported. The protocol involves chloramine-T as a practical reagent to induce in situ nitrile oxide formation and the alkyne partner is attached to the sugar residue or the nucleobase. The reactions are regiospecific, fast and high yielding.
http://eprints.maynoothuniversity.ie/4295/
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Metal free, “click and click–click” conjugation of ribonucleosides and 2′-OMe oligoribonucleotides on the solid phase
(2010)
Singh, Ishwar ; Heaney, Frances
Metal free, “click and click–click” conjugation of ribonucleosides and 2′-OMe oligoribonucleotides on the solid phase
(2010)
Singh, Ishwar ; Heaney, Frances
Abstract:
A fast and practical metal free conjugation of ribonucleosides and 2¢-OMe 4-mer oligoribonucleotides has been accomplished by a nitrile oxide alkyne click cycloaddition reaction on the solid-phase, the methodology is suited to modification at either, or both, the 3¢- or the 5¢-terminus of the oligoribonucleotide substrate.
http://eprints.maynoothuniversity.ie/4293/
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Bridgehead nitrogen heterocycles which contain the quinazoline moiety – synthesis and cycloaddition of 1,2-dihydroquinazoline 3-oxides
(2005)
Heaney, Frances; McCarthy, Tomas; Mahon, Mary; McKee, V.
Bridgehead nitrogen heterocycles which contain the quinazoline moiety – synthesis and cycloaddition of 1,2-dihydroquinazoline 3-oxides
(2005)
Heaney, Frances; McCarthy, Tomas; Mahon, Mary; McKee, V.
Abstract:
A novel synthesis of 1,2-disubstituted 1,2-dihydroquinazoline 3-oxides 8 and the first ever examples of 1,3-dipolar trapping of these nitrones to homonuclear dipolarophiles is described. The new dipoles 8 reacted with N-methyl maleimide, generating diastereomeric adducts 14–16. In the reaction between 8 and dimethyl acetylenedicarboxylate, primary cycloadducts 17 and/or stable rearrangement products, azomethine ylides 18, are formed depending on the substitution pattern of the dipole. The structure of 18c is unambiguously assigned by X-ray crystallographic analysis. An X-ray crystal structure determination is also presented for the cyclopropylisoxazoloquinazoline 22 formed by a [3 + 2] addition of 8a to 21, the dimethyl acetylenedicarboxylate tetramer.
http://eprints.maynoothuniversity.ie/4291/
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α-Oximono-esters as precursors to heterocycles – generation of oxazinone N-oxides and cycloaddition to alkene dipolarophiles
(2003)
Heaney, Frances; Fenlon, Julie; O'Mahony, Colm; McArdle, Patrick; Cunningham, Desmond
α-Oximono-esters as precursors to heterocycles – generation of oxazinone N-oxides and cycloaddition to alkene dipolarophiles
(2003)
Heaney, Frances; Fenlon, Julie; O'Mahony, Colm; McArdle, Patrick; Cunningham, Desmond
Abstract:
Preparation of a series of terminally and internally substituted δ-alkenyl and δ-alkynyl esters 6,7 and 9, potential precursors to oxazin-2-one nitrones, has been attempted. Condensation between pyruvic or benzoylformic acid and the appropriate alcohol proceeded smoothly in some cases whilst allylic transposition was a major feature in other cases – most especially during reactions with α-vinylbenzyl alcohol. Oximation of pyruvic acid derivatives furnished E-oxime isomers whilst benzoylformic acid derivatives afforded mixed geometrical isomers. The E-oxime of 4a1 carrying an internal Me group undergoes facile thermal cyclisation affording nitrones 1c and 1d in good yield. Oximes E-5a,b with a terminal methyl substituent on the alkene moiety furnish nitrone only under the influence of an external electrophile [PhSeBr/AgBF4]. A terminal Ph substituent on 5c,d prohibits formation of the cyclic dipole irrespective of reaction conditions, and whilst 5d reacts to afford a bicyclic isoxazo...
http://eprints.maynoothuniversity.ie/4289/
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A Ceric Ammonium Nitrate N-Dearylation of N-p-Anisylazoles Applied to Pyrazole, Triazole, Tetrazole, and Pentazole Rings: Release of Parent Azoles. Generation of Unstable Pentazole, HN5/N5 -, in Solution
(2008)
Butler, Richard N.; Hanniffy, John M.; Stephens, John C.; Burke, Luke A.
A Ceric Ammonium Nitrate N-Dearylation of N-p-Anisylazoles Applied to Pyrazole, Triazole, Tetrazole, and Pentazole Rings: Release of Parent Azoles. Generation of Unstable Pentazole, HN5/N5 -, in Solution
(2008)
Butler, Richard N.; Hanniffy, John M.; Stephens, John C.; Burke, Luke A.
Abstract:
The reaction of cerium(IV) ammonium nitrate (CAN) with a range of N-(p-anisyl)azoles in acetonitrile or methanol solvents leads to N-dearylation releasing the parent NH-azole and p-benzoquinone in comparable yields. The scope and limitations of the reaction are explored. It was successful with 1-(panisyl) pyrazoles, 2-(p-anisyl)-1,2,3-triazoles, 2-(p-anisyl)-2H-tetrazoles, and 1-(p-anisyl)pentazole. The dearylation renders the p-anisyl group as a potentially useful N-protecting group in azole chemistry. The azole released in solution from 1-(p-anisyl)pentazole is unstable HN5, the long-sought parent pentazolic acid. p-Anisylpentazole samples were synthesized with combinations of one, two, and three 15N atoms at all positions of the pentazole ring. The unstable HN5/N5 - produced at -40 °C did not build up in the solution but degraded to azide ion and nitrogen gas with a short lifetime. The 15N-labeling of the N3 - ion obtained from all samples proved unequivocally that it came from t...
http://eprints.maynoothuniversity.ie/3829/
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Fast RNA conjugations on solid phase by strain-promoted cycloadditions
(2012)
Singh, Ishwar ; Freeman, Colin; Madder, Annemieke; Vyle, Joseph S.; Heaney, Frances
Fast RNA conjugations on solid phase by strain-promoted cycloadditions
(2012)
Singh, Ishwar ; Freeman, Colin; Madder, Annemieke; Vyle, Joseph S.; Heaney, Frances
Abstract:
Strain promoted cycloaddition is presented as a tool for RNA conjugation on the solid phase; RNA-cyclooctyne conjugates are prepared by cycloaddition to both azide (strain-promoted azide–alkyne cycloaddition, SPAAC) and nitrile oxide dipoles (strain-promoted nitrile oxide–alkyne cycloaddition, SPNOAC). The conjugation is compatible with 2′-OMe blocks and with 2′-O-TBDMS protection on the ribose moieties of the sugar. Nitrile oxide dipoles are found to be more reactive click partners than azides. The conjugation proceeds within 10 min in aqueous solvents, at room temperature without any metal catalyst and tolerates dipoles of varying steric bulk and electronic demands, including pyrenyl, coumarin and dabcyl derivatives
http://eprints.maynoothuniversity.ie/3825/
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Phenylenediamine-based bivalent glycocyclophanes: synthesis and analysis of the influence of scaffold rigidity and ligand spacing on lectin binding in cell systems with different glycomic profiles
(2009)
Andre, Sabine; Velasco-Torrijos, Trinidad; Leyden, Rosaria; Gouin, Sebastien; Tosin, Ma...
Phenylenediamine-based bivalent glycocyclophanes: synthesis and analysis of the influence of scaffold rigidity and ligand spacing on lectin binding in cell systems with different glycomic profiles
(2009)
Andre, Sabine; Velasco-Torrijos, Trinidad; Leyden, Rosaria; Gouin, Sebastien; Tosin, Manuela; Murphy, Paul V.; Gabius, Hans-Joachim
Abstract:
The conjugation of carbohydrates to synthetic scaffolds has the goal of preparing potent inhibitors of lectin binding. We herein report the synthesis of a panel of bivalent compounds (cyclophane and terephthalamide-derivatives) then used to establish the influence of scaffold flexibility on respective inhibitory potency in a medically relevant test system. Synthetic routes to two phenylenediamine-based glycocyclophanes involving Ugi reactions of glucuronic acid derivatives and subsequent ring closing metathesis are described, as are improvements for producing terephthalamide-based carbohydrate carriers. Assays were performed with human tumour cells measuring quantitatively the influence of the test compounds on fluorescent surface staining by labelled lectins. Biological evaluation using two different lines of cancer cells as well as cells with known alterations in the glycomic profile (cells treated with an inhibitor of glycan processing and a glycosylation mutant) reduced the risk...
http://eprints.maynoothuniversity.ie/2116/
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Exploring the coordination chemistry of bifunctional organoarsonate ligands: Syntheses and characterisation of coordination polymers that contain 4-(1,2,4-triazol-4-yl)phenylarsonic acid
(2014)
VENKATESAN, MUNUSWAMY
Exploring the coordination chemistry of bifunctional organoarsonate ligands: Syntheses and characterisation of coordination polymers that contain 4-(1,2,4-triazol-4-yl)phenylarsonic acid
(2014)
VENKATESAN, MUNUSWAMY
Abstract:
This account describes the coordination chemistry of a novel bifunctional arsonic acid ligand, 4-(1,2,4-triazol-4-yl)phenylarsonic acid (H2TPAA) that contains a triazole group. Hydrothermal reactions of transition metal salts with H2TPAA produced five unprecedented coordination polymers: [Co(H2TPAA)(HTPAA)2]?H2O (1), M(HTPAA)Cl?2H2O (M = Cu (2), Co (3)) and M(HTPAA)2 (M = Mn (4), Cd (5)). These five polymers have been fully characterized by single crystal and powder X-ray diffraction, thermogravimetric analysis, infra-red spectroscopy and elemental analysis. Single crystal X-ray diffraction reveals that 1, 2 and 3 adopt 2-D layered structural motifs whereas 4 and 5 are 3-D frameworks. 1 and 3 are the first examples of arsonate-stabilised cobalt(II) coordination polymers. Likewise, 4 is recognised as the first record of a MnII arsonate coordination polymer with 3-D framework topology. Its isostructural Cd analogue 5 shows characteristic ligand-centered fluorescence properties. Magnet...
http://hdl.handle.net/2262/73308
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Wearable fluidics – the key to bringing chemistry and biology into on-body measurements
(2015)
Diamond, Dermot; O'Connor, Noel E.; Moran, Kieran; Fay, Cormac; O'Quigley, Co...
Wearable fluidics – the key to bringing chemistry and biology into on-body measurements
(2015)
Diamond, Dermot; O'Connor, Noel E.; Moran, Kieran; Fay, Cormac; O'Quigley, Conor; Coyle, Shirley; Florea, Larisa
Abstract:
Despite the wide range of applications and tremendous potential of implantable sensors targeting chemo/bio-markers, bringing actual practical devices fully to market continues to be inhibited by significant technological barriers associated with long-term reliability, which is a key requirement for implants. This is so, even with devices that appear to be well engineered, focused on apparently fairly solid markets, and based on well-established sensing principles. Wearable chem/bio-sensors offer an interesting approach, intermediate between the long-term vision of implantable devices, and the single use-disposable devices that are the current dominant use model. For example, wearable patch-type devices employing minimally invasive sampling of interstitial fluid for continuous glucose monitoring target a use period of about one week. However, despite this apparently rather modest target, large scale adoption is still frustratingly elusive, and products are being withdrawn from th...
http://doras.dcu.ie/20498/
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The self assembly of proteins; probing patchy protein interactions
(2015)
James, Susan; Quinn, Michelle K.; McManus, Jennifer J.
The self assembly of proteins; probing patchy protein interactions
(2015)
James, Susan; Quinn, Michelle K.; McManus, Jennifer J.
Abstract:
The ability to control the self-assembly of biological molecules to form defined structures, with a high degree of predictability is a central aim for soft matter science and synthetic biology. Several examples of this are known for synthetic systems, such as anisotropic colloids. However, for biomacromolecules, such as proteins, success has been more limited, since aeolotopic (or anisotropic) interactions between protein molecules are not easily predicted. We have created three double mutants of human gD-crystallin for which the phase diagrams for singly mutated proteins can be used to predict the behavior of the double mutants. These proteins provide a robust mechanism to examine the kinetic and thermodynamic properties of proteins in which competing interactions exist due to the anisotropic or patchy nature of the protein surface.
http://eprints.maynoothuniversity.ie/6027/
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The luminescent properties of CuAlO2
(2014)
Byrne, Daragh; Cowley, Aidan; Bennett, N.S.; McGlynn, Enda
The luminescent properties of CuAlO2
(2014)
Byrne, Daragh; Cowley, Aidan; Bennett, N.S.; McGlynn, Enda
Abstract:
In this work we examine the room temperature photoluminescence, Raman and low temperature photoluminescence properties of CuAlO2 prepared using different precursors. At room temperatures the luminescence associated with bulk CuAlO2 occurs at 355 nm and is associated with strong resonant Raman effects. At low temperatures we find that the UV emission is dominated by strong electron– phonon coupling leading to a Franck–Condon type emission band. A second strongly phonon coupled band is also observed in the blue spectral region. In addition we also show that at low temperatures the luminescent properties of CuAlO2 are meta-stable, with anomalous temperature dependence. The possible origins of the blue band, the meta-stability and anomalous temperature dependence are discussed.
http://doras.dcu.ie/20134/
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Synthesis, structural, photophysical and electrochemical studies of various d-metal complexes of btp [2,6-bis(1,2,3-triazol-4-yl)pyridine] ligands that give rise to the formation of metallo-supramolecular gels
(2014)
Byrne, Joseph P.; Kitchen, Johnathan A.; Kotova, Oxana; Leigh, Vivienne; Albrecht, Mart...
Synthesis, structural, photophysical and electrochemical studies of various d-metal complexes of btp [2,6-bis(1,2,3-triazol-4-yl)pyridine] ligands that give rise to the formation of metallo-supramolecular gels
(2014)
Byrne, Joseph P.; Kitchen, Johnathan A.; Kotova, Oxana; Leigh, Vivienne; Albrecht, Martin; et al.
Abstract:
2,6-Bis(1,2,3-triazol-4-yl)pyridine (btp) is a terdentate binding motif that is synthesised modularly via the CuAAC reaction. Herein, we present the synthesis of ligands 1 and 2 and the investigation of the coordination chemistry, photophysical behaviour and electrochemistry of complexes of these with a number of d-metal ions (e.g. Ru(II), Ir(III), Ni(II) and Pt(II)). The X-ray crystal structures of ligand 1 and the complexes [Ru·22](PF6)Cl, [Ni·12](PF6)Cl and [Ir·1Cl3] are also presented. All of the complexes displayed non-classical triazolyl C–HCl− hydrogen bonding. All but one complex showed no metal-based luminescence at room temperature, while all of the Pt(II) complexes displayed luminescence at 77 K. The electrochemistry of the Ru(II) complexes was also studied and these complexes were found to have higher oxidation potentials than analogous compounds. The redox behaviour of [RuL2]2+ complexes with both 1 and 2 was nearly identical, while [Ru·1Cl2(DMSO)] was oxidised at signi...
http://hdl.handle.net/10197/6590
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Catalytic and Organometallic Chemistry of Earth-Abundant Metals
(2014)
Albrecht, Martin; Bedford, Robin; Plietker, Bernd
Catalytic and Organometallic Chemistry of Earth-Abundant Metals
(2014)
Albrecht, Martin; Bedford, Robin; Plietker, Bernd
Abstract:
Why Earth - abundant metals? Their low cost, ready availability, comparatively low toxicity and greater sustainability are all factors leading to a major renaissance in the study of the organometallic chemistry of Earth - abund ant metals over the last few years.
http://hdl.handle.net/10197/6825
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How green is green chemistry? Chlorophylls as a bioresource from biorefineries and their commercial potential in medicine and photovoltaics
(2015)
SENGE, MATHIAS
How green is green chemistry? Chlorophylls as a bioresource from biorefineries and their commercial potential in medicine and photovoltaics
(2015)
SENGE, MATHIAS
http://hdl.handle.net/2262/74520
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Recent progress in theoretical and computational investigations of Li-ion battery materials and electrolytes
(2015)
Bhatt, Mahesh Datt; O'Dwyer, Colm
Recent progress in theoretical and computational investigations of Li-ion battery materials and electrolytes
(2015)
Bhatt, Mahesh Datt; O'Dwyer, Colm
Abstract:
There is an increasing worldwide demand for high energy density batteries. In recent years, rechargeable Li-ion batteries have become important power sources, and their performance gains are driving the adoption of electrical vehicles (EV) as viable alternatives to combustion engines. The exploration of new Li-ion battery materials is an important focus of materials scientists and computational physicists and chemists throughout the world. The practical applications of Li-ion batteries and emerging alternatives may not be limited to portable electronic devices and circumventing hurdles that include range anxiety and safety among others, to their widespread adoption in EV applications in the future requires new electrode materials and a fuller understanding of how the materials and the electrolyte chemistries behave. Since this field is advancing rapidly and attracting an increasing number of researchers, it is crucial to summarise the current progress and the key scientific challeng...
http://hdl.handle.net/10468/2218
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Bi- to tetravalent glycoclusters presenting GlcNAc/GalNAc as inhibitors: from plant agglutinins to human macrophage galactose-type lectin (CD301) and galectins
(2015)
Sabine André, Sabine; O'Sullivan, Shane; Koller, Christiane; Murphy, Paul V.; Gab...
Bi- to tetravalent glycoclusters presenting GlcNAc/GalNAc as inhibitors: from plant agglutinins to human macrophage galactose-type lectin (CD301) and galectins
(2015)
Sabine André, Sabine; O'Sullivan, Shane; Koller, Christiane; Murphy, Paul V.; Gabius, Hans-Joachim
Abstract:
Emerging insights into the functional spectrum of tissue lectins leads to identification of new targets for the custom-made design of potent inhibitors, providing a challenge for synthetic chemistry. The affinity and selectivity of a carbohydrate ligand for a lectin may immensely be increased by a number of approaches, which includes varying geometrical or topological features. This perspective leads to the design and synthesis of glycoclusters and their testing using assays of physiological relevance. Herein, hydroquinone, resorcinol, benzene-1,3,5-triol and tetra(4-hydroxyphenyl) ethene have been employed as scaffolds and propargyl derivatives obtained. The triazole-containing linker to the alpha/beta-O/S-glycosides of GlcNAc/GalNAc presented on these scaffolds was generated by copper-catalysed azide-alkyne cycloaddition. This strategy was used to give a panel of nine glycoclusters with bi-, tri- and tetravalency. Maintained activity for lectin binding after conjugation was ascert...
http://hdl.handle.net/10379/5375
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Size controlled synthesis of carbon quantum dots using hydride reducing agents
(2014)
Linehan, Keith; Doyle, Hugh
Size controlled synthesis of carbon quantum dots using hydride reducing agents
(2014)
Linehan, Keith; Doyle, Hugh
Abstract:
Highly luminescent carbon quantum dots (CQDs) are synthesized at room temperature by hydride reduction of carbon tetrachloride (CCl4) within inverse micelles. Regulation of the average diameter of the allylamine terminated CQDs is achieved by varying the strength of the reducing agent used. Transmission electron microscopy shows that the NCs are highly crystalline with well-defined core diameters tuned from 2 to 6 nm, while FTIR and XPS spectroscopy confirm that the CQDs possess similar surface chemistry. UV-Vis and PL spectroscopy show significant quantum confinement effects, with moderate absorption in the UV spectral range, and a strong, narrow luminescence in the visible with a marked dependency on excitation wavelength. Time resolved photoluminescence measurements showed lifetimes for all CQDs in the ns range, while a maximum PL quantum yield of 27% is observed for the CQDs.
http://hdl.handle.net/10468/2510
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A convenient synthetic route to useful monobranched polyethoxylated halogen terminated [3,3 -Co(1,2-C2B9H11)2]- synthons
(2016)
Farrà s, Pau; Teixidor, Francesc; Sillanpää, Reijo; Viñas, Clara
A convenient synthetic route to useful monobranched polyethoxylated halogen terminated [3,3 -Co(1,2-C2B9H11)2]- synthons
(2016)
Farrà s, Pau; Teixidor, Francesc; Sillanpää, Reijo; Viñas, Clara
Abstract:
An atom efficient and environmentally friendly route has been developed to obtain a new range of reagents in metallacarborane chemistry having monobranched polyethoxylated cobaltabisdicarbollide synthons.
http://hdl.handle.net/10379/5958
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The interaction of methylene blue with nucleic acids : a photophysical and photochemical study
(1987)
Van der Putten, Wilhelm J. M.
The interaction of methylene blue with nucleic acids : a photophysical and photochemical study
(1987)
Van der Putten, Wilhelm J. M.
Abstract:
THESIS 1384
http://hdl.handle.net/2262/76969
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Synthesis, structural studies and physicochemical properties of hybrid inorganic-organic materials : novel materials based on iminodiacetic acid substituted aromatic ligands
(2011)
La Spina, Giusseppe
Synthesis, structural studies and physicochemical properties of hybrid inorganic-organic materials : novel materials based on iminodiacetic acid substituted aromatic ligands
(2011)
La Spina, Giusseppe
Abstract:
THESIS 9789
http://hdl.handle.net/2262/76985
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