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Coordination behaviour in transition metal complexes of asymmetric NPN ligands

Edwards, Peter Gerald, Kariuki, Benson and Newman, Paul David 2011. Coordination behaviour in transition metal complexes of asymmetric NPN ligands. Polyhedron 30 (6) , pp. 935-941. 10.1016/j.poly.2010.12.029

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Two bicyclic, chiral aminophosphine ligands, namely 4R, 9R-1,3-bis(pyridin-2-ylmethyl)-2-(2-propyl)octahydro-1H-1,3,2-benzodiazaphosphole (1) and 4R, 9R-1,3-bis(pyridin-2-ylmethyl)-2-(2-ethoxy)octahydro-1H-1,3,2-benzodiazaphosphole (2) have been prepared from 1R, 2R-diaminocyclohexane and the appropriate dichlorophosphine and the nature of their coordination to a number of transition metals explored. Ligand 1 coordinates to Pd(II) and Pt(II) as a terdentate donor to give complexes of the type [M(κ3-N,P,N-1)Cl]+ whereas ligand 2 favours bidentate κ2-P,N coordination to give the complexes M(κ2-P,N-2)Cl2. The study of the coordination chemistry of the NPN ligand 1 is frustrated by its ready decomposition to an unknown species which appears to be promoted by transition metals. The ligand 2 does not undergo such a transformation and its metal chemistry is more readily examined. Aside from the Pt(II) and Pd(II) complexes above, 2 has been coordinated to Cr(0) and Mo(0) in the octahedral complexes M(κ2-P,N-2)(CO)4 and Au(I) in linear Au(κ1-P-2)Cl. All the complexes have been fully characterised by spectroscopic and analytical techniques including a single-crystal X-ray structure analysis of [Pt(κ3-N,P,N-1)Cl]Cl, 3.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Aminophosphine; Asymmetric; Bicyclic; Multidentate; Coordination
Publisher: Elsevier
ISSN: 0277-5387
Last Modified: 09 Jun 2020 01:34

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