Tri- and hexa-nuclear NiII -MnII complexes of a N2 O2 donor unsymmetrical ligand: synthesis, structures, magnetic properties and catalytic oxidase activities

Dalton Transactions : an International Journal of Inorganic Chemistry
Prithwish MahapatraAshutosh Ghosh

Abstract

A new mononuclear Ni(ii) complex, [NiL] (1) of an unsymmetrically dicondensed N2O2 donor ligand, H2L (where H2L = N-α-methylsalicylidene-N'-salicylidene-1,3-propanediamine), has been synthesized. Complex 1, on reaction with Mn(ii) in the presence of different co-anions, yielded three heterometallic NiII-MnII complexes, [(NiL)2Mn(NCS)2]·CH3CN (2), [(NiL)2Mn(N3)(H2O)](ClO4)·H2O (3) and [{(NiL)2Mn(H2O)}2(μ1,3-N3)](ClO4)3 (4). Single crystal structural analyses show that complexes 2 and 3 contain similar bent trinuclear NiII2MnII structures, with the difference that in complex 2 two SCN- ions and in 3, one N3- and one H2O molecule are coordinated to the Mn(ii) centre. Complex 4 possesses a hexanuclear structure, in which two trinuclear NiII2MnII units are connected via a single μ1,3-azido bridge. Variable temperature dc molar magnetic susceptibility measurements reveal that the two Mn(ii) centres in complex 4 are antiferromagnetically coupled with an exchange coupling constant (J) of -3.73 cm-1. Among the three heterometallic complexes, only 3 and 4 show bio-mimetic catalytic oxidase activities. For catecholase like activity, the turnover numbers (Kcat) of complexes 3 and 4 are 984 and 2081 h-1, respectively, whereas for phenoxazin...Continue Reading

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Citations

Jun 7, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Avijit DasAshutosh Ghosh
Nov 21, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Agnieszka MielcarekAnna Dołęga
Aug 8, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Sabarni DuttaAshutosh Ghosh
Dec 6, 2020·Journal of Inorganic Biochemistry·Winaki P SohtunRamasamy Mayilmurugan

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