[(mu-L)[RuII(acac)2]2]n, n= 2+, +, 0, -, 2-, with L = 3,3',4,4'-tetraimino-3,3',4,4'-tetrahydrobiphenyl. EPR-supported assignment of NIR absorptions for the paramagnetic intermediates

Srikanta Patra; Biprajit Sarkar; Sandeep Ghumaan; Jan Fiedler; Stanislav Zális; Wolfgang Kaim; Goutam Kumar Lahiri

doi:10.1039/b315927m

[(mu-L)[RuII(acac)2]2]n, n= 2+, +, 0, -, 2-, with L = 3,3',4,4'-tetraimino-3,3',4,4'-tetrahydrobiphenyl. EPR-supported assignment of NIR absorptions for the paramagnetic intermediates

Dalton Trans. 2004 Mar 7:(5):750-3. doi: 10.1039/b315927m. Epub 2004 Feb 3.

Authors

Srikanta Patra¹, Biprajit Sarkar, Sandeep Ghumaan, Jan Fiedler, Stanislav Zális, Wolfgang Kaim, Goutam Kumar Lahiri

Affiliation

¹ Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai.

PMID: 15252495
DOI: 10.1039/b315927m

Abstract

A complete EPR and UV-Vis-NIR spectroelectrochemical characterisation has been carried out for the series 1(2+/+/0/-/2-) where is the 1 new complex [(mu-L)[Ru(II)(acac)2]2], L = 3,3',4,4'-tetraimino-3,3',4,4'-tetrahydrobiphenyl. The paramagnetic intermediates are identified as the anion radical (L*-) complex 1*- with a long-wavelength intra-ligand transition at 2160 nm and as the weakly coupled diruthenium(II,III) species 1+ (Kc= 10(3)) with a low-intensity intervalence charge transfer (IVCT) band at 1570 nm. DFT calculations using ADF and Gaussian 03 programs support these assignments.