Alan K. Brisdon
University of Manchester
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Featured researches published by Alan K. Brisdon.
Journal of Fluorine Chemistry | 2001
Nicholas A. Barnes; Alan K. Brisdon; M.J Ellis; Robin G. Pritchard
Abstract The reaction of the HFC-replacements CF3CH2F (HFC-134a) and CF3CH2Cl (HCFC-133a) with two equivalents of butyllithium generates, in high yield, the fluorovinyllithium reagents CF2CFLi and CF2CClLi, respectively. These lithium reagents have been used to synthesise fluorovinyl-containing transition metal and main-group compounds in good yields. The resulting compounds may themselves then be used as stable transfer reagents. Here we report the synthesis of new fluorovinyl-containing organometallic complexes, fluorovinyl-containing phosphine ligands of the type RnP(CXCF2)3−n (n=1, 2; X=Cl, F) and their complexes. The single crystal X-ray structures of [Fe(η5-C5H5)(CO)2(CClCF2)], cis-[PtBr2{PEt2(CFCF2)}2] and trans-[PtCl2{PPh2(CClCF2)}2] are reported.
Journal of Organometallic Chemistry | 2000
Nicholas A. Barnes; Alan K. Brisdon; Wendy I. Cross; Joseph G. Fay; Jacqueline A Greenall; Robin G. Pritchard; James Sherrington
Abstract The one-pot reaction of the CFC replacement 1-chloro-2,2,2-trifluoroethane (CF3CH2Cl, HCFC-133a) with two equivalents of butyllithium in diethylether at −78°C followed by the addition of main group or transition metal halides results in good yields of the metal-chlorodifluorovinyl-containing compounds R3Sn(CClCF2) {R=Me, Et, Bu}, Sn(CClCF2)4, Sb(CClCF2)3, Hg(CClCF2)nCl(2−n) (n=1,2), trans-[Ni(CClCF2)2(PBu3)2], trans-[Pd(CClCF2)2(PBu3)2] and [Au(CClCF2)(PPh3)]. The molecular structures of Hg(CClCF2)Cl, trans-[Pd(CClCF2)2(Bu3P)2] and [Au(CClCF2)(PPh3)] have been obtained from single crystal data; these are the first such structural data to be reported for any chlorodifluorovinyl-containing organometallic complexes. The molecular structure of [Au(CFCF2)(PPh3)], which was prepared using a similar method based on CF3CH2F (HFC-134a), is also reported and compared with that of the chlorodifluorovinyl analogue.
Journal of Organometallic Chemistry | 1999
Kulbinder K. Banger; Alan K. Brisdon
A new route to perfluorovinyl compounds, recently reported by us, has been used to prepare the first examples of early transition metal complexes of the type Cp2M(CFCF2)nXn−2 (Cp: η5-C5H5−; M=Ti, Zr; X=Cl or F). These compounds are obtained in high yield from the two-stage, one-pot, reaction of HFC-134a (CF3CH2F) with two equivalents of BuLi, followed by addition of Cp2MX2 (M=Ti, Zr, X=F, Cl). For two of the titanium-containing compounds Ti K-edge EXAFS data have been recorded from which distances for the titanium–carbon bond of the perfluorovinyl group of 2.033(12) and 2.050(18) A in Cp2Ti(CFCF2)2 and Cp2Ti(CFCF2)F are obtained. This is the first report of structural data for any perfluorovinyl organometallic compound, and the distances obtained are consistent with the perfluorovinyl group binding in a simple sigma fashion.
Chemical Communications | 2009
Alan K. Brisdon; Christopher J. Herbert
The reaction of trimethylsilyl-containing phosphanes with perfluoroiodoalkanes provides a general and convenient route to perfluoroalkyl-containing phosphanes.
Dalton Transactions | 2011
Gregory A. Price; Kevin R. Flower; Robin G. Pritchard; Alan K. Brisdon; Peter Quayle
Cyclometallated gold(III) complexes containing functionalised (2-dimethylaminomethyl)phenyl ligands have been prepared by transmetallation from boroxines to sodium tetrachloroaurate.
Dalton Transactions | 2008
Nicholas A. Barnes; Alan K. Brisdon; F. R. William Brown; Wendy I. Cross; Christopher J. Herbert; Robin G. Pritchard; Ghazala Sadiq
The coordination chemistry of the perfluorovinyl phosphines PEt2(CF=CF2), P(i)Pr2(CF=CF2), PCy,(CF=CF2) and PPh(CF=CF2)2 to rhodium(I), palladium(II), and platinum(II) centres has been investigated. The electronic properties of the ligands are estimated based on v(CO) and 1J(Rh-P) values. X-Ray diffraction data for the square-planar Pd(II) and Pt(II) perfluorovinyl-phosphine containing complexes allow estimates of the steric demand for the series of ligands PPh2(CF=CF2), PEt2(CF=CF2), P(i)Pr2(CF=CF2), PCy2(CF=CF2) and PPh(CF=CF2)2 to be determined. The (CF=CF2) fragment is found to be more electron withdrawing than (C6F5) yet sterically less demanding. These ligands therefore provide a range of electron-neutral to phosphite-like electronic properties combined with a range of steric demands. This study also reveals that short intramolecular interactions from the metal centre to the beta-fluorine atom cis to phosphorus of the CF=CF2 groups are observed in all-trans square planar complexes of the ligands. Unusually, the complex [PtCl2{P(i)Pr2(CF=CF2)}2] crystallises with both cis- and trans-isomers present in the unit cell. It appears that co-crystallisation of both isomers occurs in order to maximise fluorous regions in the crystal packing, and the extended structure displays short fluorine-fluorine contacts. The generation of mixed geometries seems to be a phenomenon of crystallisation, as solution phase NMR studies reveal the presence of only the trans-isomer.
Journal of Fluorine Chemistry | 1999
Alan K. Brisdon; Kulbinder K. Banger
Abstract This review describes the historically important routes to fluorovinyl organometallic species of the type M-(CXCX 2 ), where M is a main-group or transition-metal element and one, or more, of the substituent atoms, X, is fluorine, the others being either other halogens, or hydrogen. A number of newer synthetic methods are described which have resulted in the preparation of a wider range of examples of such compounds. The structure, spectrocopy, properties, reactivity and future prospects for this class of compounds are described.
Chemical Communications | 2002
Alan K. Brisdon; Ian R. Crossley
The CFC replacement 1,1,1,3,3-pentafluoropropane (HFC 245 fa) has been established as a convenient source of trifluoropropynyllithium under mild conditions; a range of novel and known trifluoropropynyl-containing systems has been prepared in a one-pot procedure.
web science | 1993
Stuart A. Brewer; Alan K. Brisdon; John H. Holloway; Eric G. Hope; William Levason; J. Steven Ogden; Ahmed K. Saad
Abstract Osmium LIII edge extended X-ray absorption fine-structure data have been obtained for the title compounds and refined to give, for OsO3F2, d(OsO)1.70 A and d(OsF) 1.89 and 2.09 A, for K[OsO3F3], d(OsO)1.70 A and d(OsF)1.92 A and, for Cs2[OsO4F2], d(OsO) 1.70 A and d(OsF) 2.05 A (bond lengths accurate to ±0.02 A).
Chemical Communications | 2008
Andrew D. Ballantyne; Alan K. Brisdon; Robert A. W. Dryfe
The effect on the melting point of the introduction of asymmetry in tetraalkylammonium halide salts has been investigated leading to the synthesis of new, hydrophobic (room temperature) ionic liquids suitable for liquid/liquid electrochemistry; one of these, tri(hexyl)decylammonium tetrakis(pentafluorophenyl)borate, displays the largest electrochemical window observed to date for a biphasic room temperature ionic liquid system.