Imperial College London
Professor Vernon C. Gibson, FRS

Professor Vernon C. Gibson, FRS

Faculty of Engineering, Department of Materials

Visiting Professor
 
 
 
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Contact

 

+44 (0)20 7594 2783v.gibson

 
 
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Location

 

2.27Bessemer BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

381 results found

Whiteoak CJ, Britovsek GJP, Gibson VC, White AJPet al., 2009, Electronic effects in oxo transfer reactions catalysed by salan molybdenum(VI) cis-dioxo complexes, DALTON TRANSACTIONS, Pages: 2337-2344, ISSN: 1477-9226

Journal article

Nimitsiriwat N, Gibson VC, Marshall EL, Elsegood MRJet al., 2009, Bidentate salicylaldiminato tin(II) complexes and their use as lactide polymerisation initiators, DALTON TRANSACTIONS, Pages: 3710-3715, ISSN: 1477-9226

Journal article

Cariou R, Chirinos J, Gibson VC, Jacobsen G, Tomov AK, Elsegood MRJet al., 2009, 1,3-butadiene polymerization by bis(benzimidazolyl)amine metal complexes: Remarkable microstructural control and a protocol for in-reactor blending of trans-1,4-, cis-1,4-, and cis-1,4-co-1,2-vinylpolybutadiene., Macromolecules (Washington, DC, U. S.), Vol: 42, Pages: 1443-1444, ISSN: 0024-9297

Butadiene polymn. catalysts were obtained by treating CoCl2 or CrCl3(THF)3 with bis(benzimidazol-2-yl)methylamine ligand and the catalysts were used with PPh3 and Me aluminoxane to give polybutadienes with various microstructures and mol. wts. [on SciFinder(R)]

Journal article

Cariou R, Gibson VC, Tomov AK, White AJPet al., 2009, Group 4 metal complexes bearing new tridentate (NNO) ligands: Benzyl migration and formation of unusual C-C coupled products., J. Organomet. Chem., Vol: 694, Pages: 703-716, ISSN: 0022-328X

Group 4 metal complexes bearing new phenoxy(benzimidazolyl)-imine, -amine and -amide ligands have been synthesized. A series of metal chloride derivs. has been prepd. via treatment of MCl4(THF)2 (M = Ti, Zr, Hf) with the in situ generated sodium salt of the (benzimidazolyl)imine phenol 1. Reaction of the pro-ligand 2 with TiCl4(THF)2 afforded the corresponding complex 8 in which the amine proton remains bound to the nitrogen donor. Benzyl complexes of zirconium and hafnium were synthesized via treatment of pro-ligands 1 and 2 with M(CH2Ph)4 precursors. The complexes [NNO]M(CH2Ph)3 (6 M = Zr, 7 M = Hf) were found to undergo benzyl migration from the metal center to the imine carbon of the ligand backbone giving complexes 11 and 12; the migration follows first order kinetics. The reaction of 1 with Ti(NMe2)4 led to the formation of an unusual C-C coupled product in which a new piperazine ring has formed. Complexes 11 and 12 undergo related transformations, leading to analogous C-C coupled products which were characterized by x-ray crystallog. Deuterium labeling expts. were carried out to det. the mechanistic pathway of the reactions. Chloride and benzyl complexes 3-12 were screened as pre-catalysts for olefin polymn. [on SciFinder(R)]

Journal article

Biagini SCG, Gibson VC, Giles MR, Marshall EL, North Met al., 2008, Copolymerization of Amino Acid and Amino Ester Functionalized Norbornenes via Living Ring-Opening Metathesis Polymerization, JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, Vol: 46, Pages: 7985-7995, ISSN: 0887-624X

Journal article

Long RJ, Jones DJ, Gibson VC, White AJPet al., 2008, Zirconium Complexes Containing Tetradentate O,P,P,O Ligands: Ethylene and Propylene Polymerization Studies, ORGANOMETALLICS, Vol: 27, Pages: 5960-5967, ISSN: 0276-7333

Journal article

Nimitsiriwat N, Gibson VC, Marshall EL, Elsegood MRJet al., 2008, The reversible amination of tin(II)-ligated imines: Latent initiators for the polymerization of rac-lactide, INORGANIC CHEMISTRY, Vol: 47, Pages: 5417-5424, ISSN: 0020-1669

Journal article

Long RJ, Gibson VC, White AJP, 2008, Group 4 metal olefin polymerization catalysts stabilized by bidentate O,P ligands, ORGANOMETALLICS, Vol: 27, Pages: 235-245, ISSN: 0276-7333

Journal article

Zaher D, Tomov AK, Gibson VC, White AJPet al., 2008, Titanium complexes bearing bidentate benzimidazole-containing ligands and their behavior in ethylene polymerization., J. Organomet. Chem., Vol: 693, Pages: 3889-3896, ISSN: 0022-328X

A series of potentially bidentate benzimidazolyl ligands of the type (Bim)CH2D (where Bim = benzimidazolyl and D = NMe2 L1, NEt2 L2, NPri2 L3, OMe L4 and SMe L5) has been reacted with Ti(NMe2)4 to give five- and six-coordinate Ti(IV) complexes of the type [(Bim)CH2D]Ti(NMe2)3 and [(Bim)CH2D]2Ti(NMe2)2, resp. The X-ray structures of [{(Bim)CH2OMe}Ti(NMe2)3], [{(Bim)CH2NMe2}2Ti(NMe2)2] and [{(Bim)CH2OMe}2Ti(NMe2)2] are reported along with an evaluation of their behavior in ethylene polymn. [on SciFinder(R)]

Journal article

O'Reilly RK, Shaver MP, Gibson VC, White AJPet al., 2007, alpha-diimine, diamine, and diphosphine iron catalysts for the controlled radical polymerization of styrene and acrylate monomers, MACROMOLECULES, Vol: 40, Pages: 7441-7452, ISSN: 0024-9297

Journal article

Allan LEN, Shaver MP, White AJP, Gibson VCet al., 2007, Correlation of metal spin-state in alpha-diimine iron catalysts with polymerization mechanism, INORGANIC CHEMISTRY, Vol: 46, Pages: 8963-8970, ISSN: 0020-1669

Journal article

Gibson VC, Redshaw C, Solan GA, White AJP, Williarns DJet al., 2007, Aluminum alkyl-mediated route to novel N,N,O-chelates for five-coordinate iron(II) chloride complexes: Synthesis, structures, and ethylene polymerization studies, ORGANOMETALLICS, Vol: 26, Pages: 5119-5123, ISSN: 0276-7333

Journal article

Shaver MP, Allan LEN, Gibson VC, 2007, Organometallic intermediates in the controlled radical polymerization of styrene by alpha-diimine iron catalysts, ORGANOMETALLICS, Vol: 26, Pages: 4725-4730, ISSN: 0276-7333

Journal article

Nimitsiriwat N, Gibson VC, Marshall EL, White AJP, Dale SH, Elsegood MRJet al., 2007, Tert-butylamidinate tin(II) complexes: high activity, single-site initiators for the controlled production of polylactide, Dalton Transactions

The tin(II) coordination chemistry of two monoanionic N,N-bis(2,6-diisopropylphenyl)alkylamidinate ligands is described. Complexation studies with the acetamidinate, [MeC(NAr)2]–, (Ar = 2,6-iPr2C6H3) are complicated by the side formation of the bis(amidinate) tin(II) compound, [MeC(NAr)2]2Sn, 1. By contrast, the bulkier tert-butylamidinate, [tBuC(NAr)2]–, allows tin(II) mono-halide, -alkoxide and -amide complexes to be isolated cleanly in high yields. Thus, the reaction of [tBuC(NAr)2]H with nBuLi and subsequent treatment with SnCl2 generates [tBuC(NAr)2]SnCl, 2, in ca. 70% yield. Reactions of 2 with LiOiPr, LiNMe2 and LiNTMS2 afford [tBuC(NAr)2]Sn(OiPr), 3, [tBuC(NAr)2]Sn(NMe2), 4, and [tBuC(NAr)2]Sn(NTMS2), 5, respectively. The molecular structures of complexes 1–4 are reported. Complexes 3, 4 and 5 have been investigated as initiators for the ring-opening polymerisation of rac-lactide: 3 and 4 display characteristics of well-controlled polymerisation initiators, but high molecular weight polymer is observed with 5 due to inefficient initiation, a consequence of the steric bulk of the NTMS2 unit. Polymerisations with 3 and 4 are faster than for the corresponding -diketiminate tin(II) complexes, consistent with the more open nature of the tin(II) coordination sphere.

Journal article

Gibson VC, Redshaw C, Clegg W, Elsegood MRJet al., 2007, 'Electronic bending' of imido ligands and the effect on the coordination mode of a tridentate ancillary ligand, POLYHEDRON, Vol: 26, Pages: 3161-3167, ISSN: 0277-5387

Journal article

Gibson VC, Redshaw C, Solan GA, 2007, Bis(imino)pyridines: Surprisingly reactive ligands and a gateway to new families of catalysts, CHEMICAL REVIEWS, Vol: 107, Pages: 1745-1776, ISSN: 0009-2665

Journal article

Shaver MP, Allan LEN, Gibson VC, 2007, Ethylene polymerization under mild conditions using simple aluminum alkyls and chloro activators, ORGANOMETALLICS, Vol: 26, Pages: 2252-2257, ISSN: 0276-7333

Journal article

Atkinson RCJ, Gerry K, Gibson VC, Long NJ, Marshall EL, West LJet al., 2007, Synthesis of 1,1 '-ferrocenediyl salicylaldimine ligands and their application in titanium-initiated lactide polymerization, ORGANOMETALLICS, Vol: 26, Pages: 316-320, ISSN: 0276-7333

Journal article

Doyle DJ, Gibson VC, White AJP, 2007, Synthesis and structures of bimetallic and polymeric zinc coordination compounds supported by salicylaldiminato and anilido-aldimine ligands, DALTON TRANSACTIONS, Pages: 358-363, ISSN: 1477-9226

Journal article

Tang Z, Gibson VC, 2007, rac-Lactide polymerization using aluminum complexes bearing tetradentate phenoxy-amine ligands, EUROPEAN POLYMER JOURNAL, Vol: 43, Pages: 150-155, ISSN: 0014-3057

Journal article

Redshaw C, Gibson VC, Elsegood MRJ, Clegg Wet al., 2007, New coordination modes at molybdenum for 2-diphenylphosphinoaniline derived ligands, CHEMICAL COMMUNICATIONS, Pages: 1951-1953, ISSN: 1359-7345

Journal article

Nimitsiriwat N, Gibson VC, Marshall EL, Takolpuckdee P, Tomov AK, White AJP, Williams DJ, Elsegood MRJ, Dale SHet al., 2007, Mono- versus Bis-chelate Formation in Triazenide and Amidinate Complexes of Magnesium and Zinc., Inorg. Chem., Vol: 46, Pages: 9988-9997, ISSN: 0020-1669

Magnesium and zinc complexes of the monoanionic ligands N,N'-bis(2,6-di-isopropylphenyl)triazenide, L1, N,N'-bis(2,6-di-isopropylphenyl)acetamidinate, L2, and N,N'-bis(2,6-di-isopropylphenyl)tert-butylamidinate, L3, have been synthesized, but only L3 possesses sufficient steric bulk to prevent bis-chelation. Hence, the reaction of L1H with excess ZnEt2 leads to the isolation of (L1)2Zn, 1; L1H also reacts with Bu2Mg in Et2O to afford (L1)2Mg(Et2O), 2. Similar reactivity is obsd. for L2H, leading to the formation of (L2)2Zn, 3, and (L2)2Mg, 4. The reaction of L2H with ZnR2 may also afford the tetranuclear aggregates {(L2)Zn2R2}2O, 5 (R = Me) and 6 (R = Et). By contrast, the tert-butylamidinate ligand was found to exclusively promote mono-chelation, allowing (L3)ZnCl(THF), 7, [(L3)Zn(μ-Cl)]2, 8, (L3)ZnN(SiMe3)2, 9, (L3)MgiPr(Et2O), 10, and (L3)MgiPr(THF), 11, to be isolated. X-ray crystallog. analyses of 1, 2, 3, 4, 5, 6, 8, and 10 indicate that the capacity of L3 to resist bis-chelation is due to greater occupation of the metal coordination sphere by the N-aryl substituents. [on SciFinder(R)]

Journal article

McTavish S, Britovsek GJP, Smit TM, Gibson VC, White AJP, Williams DJet al., 2007, Iron-based ethylene polymerization catalysts supported by bis(imino)pyridine ligands: Derivatization via deprotonation/alkylation at the ketimine methyl position., J. Mol. Catal. A: Chem., Vol: 261, Pages: 293-300, ISSN: 1381-1169

Bis(imino)pyridine ligands, L [where L = 2,6-(ArNCR1)2C5H3N R1 = Et, iPr, CH2CH2Ph or CH(CH2Ph)2 and Ar = 2,4,6-(Me)3C6H2 (MES) or 2,6-(iPr)2C6H3 (DIPP)] have been prepd. by deprotonation of the parent ketimine ligand (R1 = Me) using lithium diisopropylamide (LDA), followed by alkylation with the appropriate alkylhalide. The corresponding iron dichloride complexes LFeCl2 are highly active ethylene polymn. catalysts upon treatment with methylaluminoxane (MAO), with activities in the range of 3000-18,000 g/mmol bar h. The mol. wts. (Mn) of the resultant polyethylenes lie in the range of 6500-24,000 with broad mol. wt. distributions (16.5-38.0). The nature of the imine carbon substituent has a marked effect on the polymer mol. wt. whereas the catalyst activity is largely unaffected by changes to this substituent. [on SciFinder(R)]

Journal article

Hormnirun P, Marshall EL, Gibson VC, Pugh RI, White AJPet al., 2006, Study of ligand substituent effects on the rate and stereoselectivity of lactide polymerization using aluminum salen-type initiators, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, Vol: 103, Pages: 15343-15348, ISSN: 0027-8424

Journal article

O'Reilly RK, Shaver MP, Gibson VC, 2006, Nickel(II) alpha-diimine catalysts for the atom transfer radical polymerization of styrene, INORGANICA CHIMICA ACTA, Vol: 359, Pages: 4417-4420, ISSN: 0020-1693

Journal article

Dove AP, Gibson VC, Marshall EL, Rzepa HS, White AJP, Williams DJet al., 2006, Synthetic, structural, mechanistic, and computational studies on single-site beta-diketiminate tin(II) initiators for the polymerization of rac-lactide, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 128, Pages: 9834-9843, ISSN: 0002-7863

Journal article

Gregson CKA, Gibson VC, Long NJ, Marshall EL, Oxford PJ, White AJPet al., 2006, Redox control within single-site polymerization catalysts, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 128, Pages: 7410-7411, ISSN: 0002-7863

Journal article

Jones DJ, Gibson VC, 2006, Facile synthesis of 2-arylpyrroles from 4-oxo-butanoic acids and their use in the preparation of bis(pyrrolyl)methanes, HETEROCYCLES, Vol: 68, Pages: 1121-+, ISSN: 0385-5414

Journal article

Gibson VC, 2006, Shuttling polyolefins to a new materials dimension, SCIENCE, Vol: 312, Pages: 703-704, ISSN: 0036-8075

Journal article

Oakes DCH, Gibson VC, White AJP, Williams DJet al., 2006, Highly active titanium-based olefin polymerization catalysts supported by bidentate phenoxyamide ligands, INORGANIC CHEMISTRY, Vol: 45, Pages: 3476-3477, ISSN: 0020-1669

Journal article

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