N2O2S-donor redox-active ligand coordinated dinuclear manganese(II) and cobalt(II) complexes: crystal structures, magnetic properties and electrochemical hydrogen evolution

Asik Ikbal; Gouri Sankar Das; Sakshi Mehta; Suraj Kumar Agrawalla; Chandra Shekhar Purohit; Nilankar Diyali; Abhishake Mondal; Bhaskar Biswas; Hari Sankar Das

doi:10.1039/D5DT00744E

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N₂O₂S-donor redox-active ligand coordinated dinuclear manganese(ii) and cobalt(ii) complexes: crystal structures, magnetic properties and electrochemical hydrogen evolution

Asik Ikbal,

^a Gouri Sankar Das,^b Sakshi Mehta,^c Suraj Kumar Agrawalla,^d Chandra Shekhar Purohit,

^d Nilankar Diyali,

^a Abhishake Mondal,

^c Bhaskar Biswas

*^a and Hari Sankar Das

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, University of North Bengal, Darjeeling-734013, India
E-mail: haridasiitk@gmail.com, bhaskarbiswas@nbu.ac.in

^b Department of Chemistry, Indian Institute of Petroleum and Energy, Visakhapatnam, Andhra Pradesh, India

^c Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C. V. Raman Road, 560012 Bangalore, India

^d School of Chemical Sciences, NISER-Bhubaneswar, Orissa, India

Abstract

In this study, we found the significant catalytic activity of two dinuclear complexes of manganese(II) and cobalt(II), supported by a biologically relevant pentacoordinated N₂O₂S-donor Schiff base ligand towards the electrochemical hydrogen evolution reaction (HER). The cobalt complex exhibits superior HER activity, displaying a Tafel slope of 77 mV per decade, compared to the manganese complex under the same conditions, which has a Tafel slope of 154 mV. The study also explores the structural, magnetic, and redox characteristics of the complexes to provide insight into these intricate systems.

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Article information

DOI: https://doi.org/10.1039/D5DT00744E
Article type: Communication
Submitted: 27 Mar 2025
Accepted: 30 Jul 2025
First published: 30 Jul 2025

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Dalton Trans., 2025, Advance Article

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N₂O₂S-donor redox-active ligand coordinated dinuclear manganese(II) and cobalt(II) complexes: crystal structures, magnetic properties and electrochemical hydrogen evolution

A. Ikbal, G. S. Das, S. Mehta, S. K. Agrawalla, C. S. Purohit, N. Diyali, A. Mondal, B. Biswas and H. S. Das, Dalton Trans., 2025, Advance Article , DOI: 10.1039/D5DT00744E

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