title: [(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.
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.
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai.
authors.forename: Srikanta
authors.initials: S
authors.lastname: Patra
authors.forename: Biprajit
authors.initials: B
authors.lastname: Sarkar
authors.forename: Sandeep
authors.initials: S
authors.lastname: Ghumaan
authors.forename: Jan
authors.initials: J
authors.lastname: Fiedler
authors.forename: Stanislav
authors.initials: S
authors.lastname: Zális
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Kaim
authors.forename: Goutam
authors.initials: G
authors.lastname: Kumar Lahiri