Issue 21, 2004

High-frequency EPR study of reduced diruthenium and dirhenium polypyridine complexes based on the 1,2,4,5-tetrazine radical bridge

Abstract

The radical complexes {(μ-L)[Ru(bpy)2]23+, {(μ-bmtz)[Ru(cym)Cl]2+ and {(μ-L)[Re(CO)3Cl]2, where L are 3,6-disubstituted 1,2,4,5-tetrazines such as 3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine (bmtz) and cym = p-cymene, were studied by X-band EPR in fluid solution and by 285 GHz EPR in glassy frozen solution. A comparison with other transition metal complexes (Cu, Rh, Os, Ir, Pt) involving tetrazine radical ligands reveals that the g anisotropy reflects (i) the π acceptor effect of the tetrazine substituents, (ii) the competition from ancillary π acceptor ligands for back donation from the metal, and (iii) the spin–orbit coupling contributions from the transition metal.

Graphical abstract: High-frequency EPR study of reduced diruthenium and dirhenium polypyridine complexes based on the 1,2,4,5-tetrazine radical bridge

Article information

Article type
Paper
Submitted
19 May 2004
Accepted
22 Sep 2004
First published
08 Oct 2004

Dalton Trans., 2004, 3727-3731

High-frequency EPR study of reduced diruthenium and dirhenium polypyridine complexes based on the 1,2,4,5-tetrazine radical bridge

B. Sarkar, S. Frantz, W. Kaim and C. Duboc, Dalton Trans., 2004, 3727 DOI: 10.1039/B407611G

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