(μ-L)RuII(acac)22n, 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 Transactions, 5:750--753, 2004. [PUMA: DFT IR MO binuclear calcn;near complex complex;EPR complex;frontier complex;ruthenium electrochem paramagnetic prepn redox ruthenium spectroelectrochem tetraiminobiphenyl]