Herein we report two new mononuclear heteroleptic Ruthenium complexes, 1 and 2 with anionic N, O donor pyridine dicarboxylate (pdc2-) ligand along with neutral bipyridine moieties. The general formula of the complexes are [RuIII(pdc2-)(L1)Cl] (1), [RuIII(pdc2-
)(L2)Cl] (2) (Where L1= Bipyridine, L2 = 4,4’-dimethylbipyride). Synthesis, characterization and water oxidation catalytic properties of both complexes were investigated. A combined theoretical (DFT) and experimental study were carried out to investigate the catalytic (in presence of CAN) and electrocatalytic activity of 1 and 2 for water oxidation in aqueous solution at pH~1. During electrocatalysis, the catalytic activity wave has been detected in acetonitrile/water 1:9 (v/v) solution in the range 1.39-1.41V vs SCE. pH based electrochemistry reveals that, water oxidation (at pH=1) takes place via sequential proton- electron transfer process to form a RuV=O moiety, which oxidises water through I2M pathway. For water oxidation by CAN, both the molecules show appreciably high TOF values (3.47971 x10-4S-1 and 1.183 x 10-3S-1and 1.183 x 10-3S-1for 1 and 2 respectively) in comparison to similar molecules1,2

Chemical and electrochemical water oxidation catalyzed by heteroleptic Ru(III) complexes of anionic 2,6 pyridine dicarboxylate ligand: Experimental and theoretical study

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27th CRSI National Symposium in Chemistry

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