Linking thione-ligated copper(I) centres with trans-1,2-bis(diphenylphosphino)ethene ( trans-dppen): crystal structures of the pyrimidine-2-thione derivatives [CuBr(μ 2- trans-dppen)(pymtH)] 2 and [CuI(μ 2- trans-dppen)(pymtH)] 2

• Published in: Polyhedron Vol. 24; no. 2; pp. 351 - 358
• Main Authors: Divanidis, S., Cox, P.J., Karagiannidis, P., Aslanidis, P.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 27-01-2005
• Subjects: Copper(I) halide complexes; Crystal structures; Heterocyclic thione complexes; trans-1,2-Bis(diphenylphosphino)ethene complexes; Copper(I) halide complexes; Heterocyclic thione complexes; Crystal structures; trans-1,2-Bis(diphenylphosphino)ethene complexes
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2004.11.015

The behaviour of the diphos ligand
trans-1,2-bis (diphenylphosphino)ethene (
trans-dppen) towards coordination of CuX [X
=
Br, I] in the presence of several heterocyclic thione ligands has been investigated. The diphos ligand adopts the doubly-bridging coordination mode whereby the thiones are terminally bound through the exocyclic sulfur atom, leading to the formation of homobimetallic complexes of type [CuX(μ
2-
trans-dppen)L]
2. The crystal structures of two examples of the novel complexes have been characterized by X-ray crystallography.
Several mixed-ligand complexes of the composition [CuX(
trans-dppen)(L)] (X
=
Br, I) have been prepared by treatment of copper(I) halide with equimolar amounts of
trans-1,2-bis(diphenylphosphino)ethene (
trans-dppen) in acetonitrile followed by the addition of a methanolic solution of one equivalent of a heterocyclic thione (L). The novel complex compounds have been characterized by
1H NMR and IR spectroscopy as well as by elemental analyses and melting points. The X-ray structures of two representative examples, namely the pyrimidine-2-thione complexes of copper(I) bromide and iodide confirm that the compounds are dimers of type [CuX(μ
2-
trans-dppen)(L)]
2 containing two tetrahedral coordination units joined by two diphosphine bridges.