Publications
234 results found
Hubbard SM, Haaf MP, Williams CK, et al., 2012, Isotactic polylactic acid (PLA) formation with chiral aluminum hydroxyquinolate catalysts, 11th International Biorelated Polymer Symposium / 243rd National Spring Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Thi-Phuong-Anh C, Buchard A, Le Goff XF, et al., 2012, Phosphasalen Yttrium Complexes: Highly Active and Stereoselective Initiators for Lactide Polymerization, INORGANIC CHEMISTRY, Vol: 51, Pages: 2157-2169, ISSN: 0020-1669
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- Citations: 99
Kember MR, Jutz F, Buchard A, et al., 2012, Di-cobalt(II) catalysts for the copolymerisation of CO2 and cyclohexene oxide: support for a dinuclear mechanism?, CHEMICAL SCIENCE, Vol: 3, Pages: 1245-1255, ISSN: 2041-6520
The synthesis and characterisation of a series of di-cobalt(II) halide complexes, coordinated by a macrocyclic ancillary ligand, is reported. The new complexes show excellent activity as catalysts for the copolymerisation of cyclohexene oxide (CHO) and carbon dioxide, under just 1 atmosphere of pressure of CO2. The complexation of a series of co-ligands has been investigated, including nucleophiles of varying strength, (4-dimethylaminopyridine (DMAP), N-methylimidazole (MeIm) and pyridine), and the anionic donor (Cl) from bulky ammonium salts, ([HNEt3]Cl, [DBU-H]Cl and [MTBD-H]Cl). Structure-activity studies of the complexes, including X-ray crystallography data, in conjunction with mass spectrometry experiments, are used to support a proposed dinuclear mechanism. The initial rate of copolymerisation, determined using in situ attenuated total reflectance infrared (ATR-IR) spectroscopy, shows a first order dependence on both the catalyst concentration and the concentration of cyclohexene oxide. A dinuclear mechanism is proposed in which catalysis occurs on the convex face of the molecule, leading to chain growth from a single site.
Buchard A, Bakewell CM, Weiner J, et al., 2012, Recent Developments in Catalytic Activation of Renewable Resources for Polymer Synthesis, ORGANOMETALLICS AND RENEWABLES, Editors: Meier, Weckhuysen, Bruijnincx, Publisher: SPRINGER-VERLAG BERLIN, Pages: 175-224, ISBN: 978-3-642-28287-4
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- Citations: 38
Kember MR, Copley J, Buchard A, et al., 2012, Triblock copolymers from lactide and telechelic poly(cyclohexene carbonate), POLYMER CHEMISTRY, Vol: 3, Pages: 1196-1201, ISSN: 1759-9954
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- Citations: 97
Jutz F, Buchard A, Kember MR, et al., 2011, Mechanistic Investigation and Reaction Kinetics of the Low-Pressure Copolymerization of Cyclohexene Oxide and Carbon Dioxide Catalyzed by a Dizinc Complex, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 133, Pages: 17395-17405, ISSN: 0002-7863
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- Citations: 167
Kember MR, Jutz F, White AJ, et al., 2011, Dinuclear catalysts for the copolymerization of cyclohexene oxide and CO<sub>2</sub>, 242nd National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Donaghey JE, Ashraf S, Zhang W, et al., 2011, Pyrroloindacenodithiophene containing polymers: Synthesis and characterization, 242nd National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Holmes AB, Jones DJ, Wong WWH, et al., 2011, Synthesis of conjugated materials for light emission and light harvesting, 242nd National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Platel RH, White AJP, Williams CK, 2011, Bis(phosphinic)diamido Yttrium Amide, Alkoxide, and Aryloxide Complexes: An Evaluation of Lactide Ring-Opening Polymerization Initiator Efficiency, INORGANIC CHEMISTRY, Vol: 50, Pages: 7718-7728, ISSN: 0020-1669
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- Citations: 67
Orchard KL, Harris JE, White AJP, et al., 2011, Solvent Dependence of the Structure of Ethylzinc Acetate and Its Application in CO<sub>2</sub>/Epoxide Copolymerization, ORGANOMETALLICS, Vol: 30, Pages: 2223-2229, ISSN: 0276-7333
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- Citations: 21
Cary SK, Thompson SM, Haaf MP, et al., 2011, Stereoselective lactide polymerization with aluminum catalysts, 241st National Meeting and Exposition of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Buchard A, Kember MR, Sandeman KG, et al., 2011, A bimetallic iron(III) catalyst for CO<sub>2</sub>/epoxide coupling, CHEMICAL COMMUNICATIONS, Vol: 47, Pages: 212-214, ISSN: 1359-7345
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- Citations: 350
Donaghey JE, Ashraf RS, Kim Y, et al., 2011, Pyrroloindacenodithiophene containing polymers for organic field effect transistors and organic photovoltaics, Journal of Materials Chemistry, Vol: 21, Pages: 18744-18752, ISSN: 0959-9428
The synthesis of the novel electron-rich pyrroloindacenodithiophene (NIDT) unit is reported. Stille copolymerization of the distannylated NIDT unit, with the electron-deficient dibrominated benzothiadiazole (BT), difluorobenzothiadiazole (ffBT), thienopyrrolodione (TPD) and 1,1[prime or minute]-bithienopyrrolodione (biTPD) units afforded a series of low band gap semiconducting polymers. Initial testing shows promise for the use of these materials as p-type semiconductors in organic field effect transistors (OFETs) with mobilities as high as 0.07 cm2V-1s-1 being measured. These materials have also been tested as the donor polymer in polymer/fullerene bulk heterojunction organic photovoltaics (OPVs) giving maximum efficiencies of 2.5%.
Keyworth CW, Chan KL, Labram JG, et al., 2011, The tuning of the energy levels of dibenzosilole copolymers and applications in organic electronics, Journal of Materials Chemistry, Vol: 21, Pages: 11800-11814, ISSN: 0959-9428
An understanding of the structure-function relationships of conjugated polymers is an invaluable resource for the successful design of new materials for use in organic electronics. To this end, we report the synthesis, characterisation and optoelectronic properties of a range of new alternating copolymers of dibenzosilole. Suzuki polycondensation reactions were used to afford a series of eight conjugated materials by the respective combination of either a 3,6- or 2,7-linked 9,9-dioctyldibenzosilole with 3,6-linked-N-octylcarbazole, triarylamine, oxadiazole and triazole monomers. The copolymers were fully characterised using 1H, 13C{1H} NMR spectroscopy, size exclusion chromatography (SEC), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The photophysical properties were determined using UV-Vis spectroscopy, photoluminescence (PL) measurements, cyclic voltammetry (CV) and photoelectron emission spectroscopy in air (PESA). The spectroscopic and electrochemical measurements were used to determine the materials' HOMO and LUMO energies and the values were correlated with the copolymer composition and structure. A selection of the copolymers (P4, P5 and P8) were evaluated as the active layer within single-layer polymer light emitting diodes (PLEDs), with the configuration: glass/ITO/PEDOT:PSS/emissive layer/Ba/Al, which gave low intensity electroluminescence. The selected copolymers were also evaluated as the organic semiconductor in bottom-gate, bottom-contact organic field effect transistors (OFETs). The best performing devices gave a maximum mobility of 3 [times] 10-4 cm2 V-1 s-1 and on/off current ratios of 105.
Kember MR, Buchard A, Williams CK, 2011, Catalysts for CO<sub>2</sub>/epoxide copolymerisation, CHEMICAL COMMUNICATIONS, Vol: 47, Pages: 141-163, ISSN: 1359-7345
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- Citations: 665
Albert-Seifried S, Hodgkiss JM, Laquai F, et al., 2010, Pressure-Induced Delocalization of Photoexcited States in a Semiconducting Polymer, PHYSICAL REVIEW LETTERS, Vol: 105, ISSN: 0031-9007
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- Citations: 19
Haider A, Williams CK, 2010, Polylactides with aldaric ester end groups or chain extending groups, COMPTES RENDUS CHIMIE, Vol: 14, Pages: 736-744, ISSN: 1631-0748
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- Citations: 3
Tang M, Dong Y, Stevens MM, et al., 2010, Tailoring Polylactide Degradation: Copolymerization of a Carbohydrate Lactone and S,S-Lactide, Macromolecules, Vol: 43, Pages: 7556-7564, ISSN: 0024-9297
Kember MR, Williams CK, 2010, Cobalt catalysts for the copolymerization of epoxides and carbon dioxide, ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 240, ISSN: 0065-7727
Williams CK, Kember MR, White AJP, 2010, Bimetallic catalysts for CO<sub>2</sub>-cyclohexene oxide copolymerizations, ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 240, ISSN: 0065-7727
Mac Dowell N, Florin N, Buchard A, et al., 2010, An Overview of CO2 capture technologies, Energy and Environmental Science, Vol: 3, Pages: 1645-1669
Buchard A, Platel RH, Auffrant A, et al., 2010, Iminophosphorane Neodymium(III) Complexes As Efficient Initiators for Lactide Polymerization, ORGANOMETALLICS, Vol: 29, Pages: 2892-2900, ISSN: 0276-7333
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- Citations: 77
Levine A, Roaf J, Haaf MP, et al., 2010, Lactide polymerization with chiral aluminum catalysts, ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 239, ISSN: 0065-7727
Kember MR, White AJP, Williams CK, 2010, Highly Active Di- and Trimetallic Cobalt Catalysts for the Copolymerization of CHO and CO<sub>2</sub> at Atmospheric Pressure, MACROMOLECULES, Vol: 43, Pages: 2291-2298, ISSN: 0024-9297
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- Citations: 163
Howard IA, Hodgkiss JM, Zhang X, et al., 2010, Charge Recombination and Exciton Annihilation Reactions in Conjugated Polymer Blends, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 132, Pages: 328-335, ISSN: 0002-7863
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- Citations: 63
Orchard KL, White AJP, Shaffer MSP, et al., 2009, Pentanuclear Complexes for a Series of Alkylzinc Carboxylates, ORGANOMETALLICS, Vol: 28, Pages: 5828-5832, ISSN: 0276-7333
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- Citations: 31
Kember MR, White AJP, Williams CK, 2009, Di- and Tri-Zinc Catalysts for the Low-Pressure Copolymerization of CO<sub>2</sub> and Cyclohexene Oxide, INORGANIC CHEMISTRY, Vol: 48, Pages: 9535-9542, ISSN: 0020-1669
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- Citations: 114
Tang M, Steves MM, Williams CK, 2009, Polymerization of a carbohydrate lactone, WO2009118538 (A2)
Horst S, Evans NR, Bronstein HA, et al., 2009, Synthesis of Fluoro-Substituted Silole-Containing Conjugated Materials, JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, Vol: 47, Pages: 5116-5125, ISSN: 0887-624X
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- Citations: 16
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