Spectroelectrochemical (UV/VIS/Near IR, EPR) Studies of Coordination Complexes View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1993

AUTHORS

S. A. MacGregor , E. McInnes , R. J. Sorbie , L. J. Yellowlees

ABSTRACT

The design of variable temperature speclroclcclrochcmical cells Tor use in uv/vis/nir and epr spectrometers is detailed. The systems investigated using the spcctroeleclrochemical cells are binuclcar mixed-valence ruthenium and osmium complexes and mononuclear Pt species. Intervalence charge transfer (IVCT) bands of the mixed-valence compounds are studied in situ with the M(II),M(III) state elcctrochcmically generated from the parent M(II),M(II) complex. The symmetric species [M2(μ-Cl)3L6]2+ where M = Ru,Os and L is a tertiary phosphine ligand are class III delocaliscd systems whereas the asymmetric complex [Cl(PPh3)2Ru(-Cl)3Ru(PPh3)2CS]+ is a class II, valence trapped compound. Removal of electrons from the symmetric complex results in metal-metal interaction as confirmed by single crystal X-ray determinations of [OS2(μ-CI)3(PEt3)6]+ and [OS2(μ-CL)3(PET3)O6]2+ The thermal election transfer rate constant is determined for the mixed-valence asymmetric complex from the IVCT band; kth=2.9 × 104 s-1. The complex [Pt(bpy)Cl2] has a reversible onc-eletron reduction. The electronic character of the semi-occupied molecular orbital (SOMO) of [Pt(bpy)Cl2]- is studied by epr and uv/vis/nir spcctroelectrochemistry and is determined to be primarily bpy-bascd. Epr data arc also given for [Pt(dpk)Cl2]- and [Pt(B10H12)2]3-, the SOMO of the former complex is ligand-bascd but has considerably greater Pi character in the second. More... »

PAGES

503-517

Book

TITLE

Molecular Electrochemistry of Inorganic, Bioinorganic and Organometallic Compounds

ISBN

978-94-010-4710-4
978-94-011-1628-2

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-94-011-1628-2_48

DOI

http://dx.doi.org/10.1007/978-94-011-1628-2_48

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1004946516


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