Oxo-bridged trinuclear and tetranuclear manganese complexes supported with nitrogen donor ligands: syntheses, structures and properties

Bansal, Deepak and Mondal, Abhishake and Lakshminarasimhan, N and Gupta, Rajeev (2019) Oxo-bridged trinuclear and tetranuclear manganese complexes supported with nitrogen donor ligands: syntheses, structures and properties. In: DALTON TRANSACTIONS, 48 (22). pp. 7918-7927.

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Abstract

In this work, we present the syntheses of two mu(3)-oxo bridged mixed-valent trinuclear (MnMnIII)-Mn-II complexes (1 and 2) and a mu(4)-oxo bridged tetranuclear Mn-4(II) complex (3). All the three manganese complexes have been characterized crystallographically and by using different analytical techniques. Both mixed-valent trinuclear complexes 1 and 2 exhibited Jahn-Teller distortion for the Mn(III) ion. Variable temperature magnetic susceptibility studies of all three complexes revealed antiferromagnetic coupling between the closely placed paramagnetic manganese ions mediated via a mu-oxo bridge. Cyclic voltammetry studies displayed both Mn(III)/Mn(II) and Mn(IV) Mn(III) redox couples in 1 whereas only the Mn(III) Mn(II) couple was observed for complexes 2 and 3. Importantly, complexes 2 and 3 were found to disproportionate H2O2, and the catalase activity has been related to their structural features and redox properties.

Item Type:	Journal Article
Publication:	DALTON TRANSACTIONS
Publisher:	ROYAL SOC CHEMISTRY
Additional Information:	Copyright of this article belongs to ROYAL SOC CHEMISTRY
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	22 Jul 2019 05:47
Last Modified:	22 Jul 2019 05:47
URI:	http://eprints.iisc.ac.in/id/eprint/63125

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