Synthesis and Spectroscopic Characterisation of Bis(bis(Bipyridine) ruthenium(II))-3,3',4,4'-Tetraiminobiphenyl and its Redox Products
Abstract
Tetraiminobiphenyl forms a redox series of binuclear complexes obtained by coordinating the Ru(bpy)2 (bpy = 2, 2 - bipyridine) fragment at each end of the molecule. The ligand is capable of existing in six redox states, and three of these, including a mixed valence species, are characterised as their bis(Ru(bpy)2) complexes. Electrochemical, electron spin resonance and optical data are presented. These are discussed in terms of localisation and delocalisation of the ruthenium to ligand charge transfer states as a function of redox level. The mixed valence species displays an intervalence (ligand to ligand) charge transfer band, and the degree of electronic coupling is shown to be relatively large. There is some evidence that the biphenyl twist angle changes with oxidation state suggesting that these complexes might be useful building blocks for molecular wires and switches. (JES)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 10, 1990
- Accession Number
- ADA222244
Entities
People
- Alfred Beverley Philip Lever
- P. R. Auburn
Organizations
- University of York