Accession Number:

ADA222244

Title:

Synthesis and Spectroscopic Characterisation of Bis(bis(Bipyridine) ruthenium(II))-3,3',4,4'-Tetraiminobiphenyl and its Redox Products

Descriptive Note:

Technical rept. Aug 1989-Aug 1990,

Corporate Author:

YORK UNIV NORTH YORK (ONTARIO) DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1990-05-10

Pagination or Media Count:

20.0

Abstract:

Tetraiminobiphenyl forms a redox series of binuclear complexes obtained by coordinating the Rubpy2 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 bisRubpy2 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

Subject Categories:

  • Organic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE