Please use this identifier to cite or link to this item:
DC FieldValue
dc.titleSynthesis and electrospray mass spectrometry of palladium(II) diphosphine complexes from oxidative addition of 2-bromopyridine to Pd0
dc.contributor.authorChin, C.C.H.
dc.contributor.authorYeo, J.S.L.
dc.contributor.authorLoh, Z.H.
dc.contributor.authorVittal, J.J.
dc.contributor.authorHenderson, W.
dc.contributor.authorHor, T.S.A.
dc.identifier.citationChin, C.C.H.,Yeo, J.S.L.,Loh, Z.H.,Vittal, J.J.,Henderson, W.,Hor, T.S.A. (1998-11-21). Synthesis and electrospray mass spectrometry of palladium(II) diphosphine complexes from oxidative addition of 2-bromopyridine to Pd0. Journal of the Chemical Society - Dalton Transactions (22) : 3777-3784. ScholarBank@NUS Repository.
dc.description.abstractOxidative addition reactions of palladium(0) phosphine complexes with 2-bromopyridine gave rise to a series of structurally distinctive complexes, namely trans-(N,P)-[Pd2Br2(PPh3) 2(μ-C5H4N-C2,N)2] 1, [Pd2(μ-C5H4N-C2,N) 2-(μ-dppm)2]Br2 2, [Pd2(η1-dppp)2-(μ-C5H 4N-C2,N)2(μ-dppp)]Br2 3, trans-[{PdBr(η1-C5H4N-C 2)(μ-dppb)}n] 4, trans-(N,P)-[Pd2Br2(μ-C5H 4N-C2,N)2(μ-dppb)] 5 and cis-[PdBr(η1-C5H4NH-C 2)(η2-dppf)]Br 6 [Ph2P(CH2)nPPh2, n = 1(dppm), 3(dppp) or 4(dppb); dppf= Fe(Ph2PC5H4)2]. Similarly, trans-(N,P)-[Pd2Cl2(μ-C9H 6N-C2,N)2(μ-dppb)] 7 has been obtained from 2-chloroquinoline and [Pd(dppb)2]. An array of structural possibilities is envisaged based on the different co-ordination modes of the pyridine (C or/and N bonded; terminal or bridging; pyridyl, pyridine or pyridinium), phosphine (terminal, bridging or chelating) bromide (terminal or ionised) ligands. Complexes 2 and 3, but not the others, can be obtained from phosphine exchange reactions of 1. Complexes 5 and 6 were analysed by X-ray single-crystal crystallographic methods. The former reveals a dinuclear structure with a dppb ligand bridging diagonally two metals that are juxtaposed by two syn-bridging pyridyl groups. It represents an unusual dinuclear core stabilised by two types of bridging ligands of contrasting steric and geometric demands. The latter shows a cationic and mononuclear square planar palladium(II) complex containing a chelating dppf, terminal bromide and an unusual C-bonded pyridyl group with the N-site protonated. The fragmentation of these complexes was investigated by electrospray mass spectrometry under different cone voltages. Breakdown of the dinuclear framework is facilitated by addition of H-Br to the N-Pd bonds of the bridging pyridyl group.
dc.description.sourcetitleJournal of the Chemical Society - Dalton Transactions
Appears in Collections:Staff Publications

Show simple item record
Files in This Item:
There are no files associated with this item.

Page view(s)

checked on Mar 29, 2020

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.