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Issue 10, 2017
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Luminescent closed shell nickel(II) pyridyl-azo-oximates and the open shell anion radical congener: molecular and electronic structure, ligand redox behaviour and biological activity

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Abstract

Luminescent nickel(II) complexes of type [NiII(L−I)2], 2, have been synthesized using photosensitizer redox-active oxime ligands HL, 1, incorporating the π-acidic azo and pyridyl functions. The redox non-innocent behaviour of the ligands has been exploited to isolate the open shell Ni(II)-bound azo-oxime anion radical complexes of type Et4N[NiII{(L−I)2}•−], 3, via reduction with NaBH4. The superior stabilization of the unpaired spin over the ligand framework has been established by EPR and DFT studies. The anti-bacterial activity of 2 has been scrutinized and it has been found to exhibit potential radical scavenging activity.

Graphical abstract: Luminescent closed shell nickel(ii) pyridyl-azo-oximates and the open shell anion radical congener: molecular and electronic structure, ligand redox behaviour and biological activity

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Publication details

The article was received on 03 Feb 2017, accepted on 19 Apr 2017 and first published on 19 Apr 2017


Article type: Paper
DOI: 10.1039/C7NJ00402H
Citation: New J. Chem., 2017,41, 4157-4164
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    Luminescent closed shell nickel(II) pyridyl-azo-oximates and the open shell anion radical congener: molecular and electronic structure, ligand redox behaviour and biological activity

    S. Pramanik, S. Dutta, S. Roy, S. Dinda, T. Ghorui, A. Kumar Mitra, K. Pramanik and S. Ganguly, New J. Chem., 2017, 41, 4157
    DOI: 10.1039/C7NJ00402H

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