An overview of the effect of anionic coligand on structure and magnetic properties of some homometallic NiII and heterometallic NiII-MnII complexes of Schiff base ligands
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2024
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Abstract
Homometallic NiII-Schiff base complexes with various anionic coligands have been widely studied for their structural diversity, catalytic and magnetic properties. Introduction of MnII as heterometal in these complexes is very much challenging to the synthetic and magneto-chemist as MnII possesses higher number of unpaired electrons in high spin ground state. Thus in NiII-MnII heterometallic polynuclear complexes spin–spin interaction and easy axis type magnetic anisotropy can lead to ferromagnetism, antiferromagnetism, ferrimagnetism, etc. In this dissertation we have discussed the synthetic strategies, structural features and magnetic properties of 20 homometallic NiII complexes and 13 heterometallic NiII-MnII complexes derived from some tridentate (N2O), tetradentate (N2O2) and hexadentate (N3O3) Schiff base ligands and various terminally coordinating or bridging anionic coligands (carboxylate, nitrate, nitrite, azide, thiocyanate, dicyanamide etc.). The profound role of anionic coligand in mediating phenoxido bridging angles and hence magnetic behavior of these complexes is also been highlighted.
Description
Homometallic NiII-Schiff base complexes with various anionic coligands have been widely studied for their structural diversity, catalytic and magnetic properties. Introduction of MnII as heterometal in these complexes is very much challenging to the synthetic and magneto-chemist as MnII possesses higher number of unpaired electrons in high spin ground state. Thus in NiII-MnII heterometallic polynuclear complexes spin–spin interaction and easy axis type magnetic anisotropy can lead to ferromagnetism, antiferromagnetism, ferrimagnetism, etc. In this dissertation we have discussed the synthetic strategies, structural features and magnetic properties of 20 homometallic NiII complexes and 13 heterometallic NiII-MnII complexes derived from some tridentate (N2O), tetradentate (N2O2) and hexadentate (N3O3) Schiff base ligands and various terminally coordinating or bridging anionic coligands (carboxylate, nitrate, nitrite, azide, thiocyanate, dicyanamide etc.). The profound role of anionic coligand in mediating phenoxido bridging angles and hence magnetic behavior of these complexes is also been highlighted.