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Updated: Feb 18, 2026
The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Isomeric Diruthenium Complexes Bridged by Deprotonated Indigo in cis and trans Configuration
Madhumita Chatterjee1, Prabir Ghosh1, Katharina Beyer2
1Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India.
Abstract:
The doubly deprotonated form L2- of indigo=H2 L can bind two [Ru(acac)2 ] complex fragments in the cis (1) and trans configuration (2), as evidenced from crystal structure analysis. While the latter type of N,O; N' ,O' coordination has been observed earlier, for example, with [Ru(bpy)2 ]2+ , leading to two equivalent six-membered ring chelates, the cis arrangement in 1 is observed here for the first time in a dinuclear complex, producing one five-membered ring chelate with N,N' coordination and one seven-membered chelate with O,O' coordination. The different structures of the isomers result in differing electrochemical and spectroelectrochemical (EPR, UV-Vis-NIR) responses for various accessible charge states 1n and 2n , n=-, 0, +, 2+. The associated electronic structures were analyzed by DFT (structures, spin density) and TD-DFT calculations (electronic transitions), revealing mainly metal-based reduction but largely indigo ligand-based oxidation of both neutral precursors.
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