| Autor: |
Chaurasia R; Department of Chemistry, Banaras Hindu University, Varanasi-221005, India. manoj_vns2005@yahoo.co.in., Pandey SK; Department of Chemistry, Banaras Hindu University, Varanasi-221005, India. manoj_vns2005@yahoo.co.in., Singh DK; Department of Chemistry, Banaras Hindu University, Varanasi-221005, India. manoj_vns2005@yahoo.co.in., Bharty MK; Department of Chemistry, Banaras Hindu University, Varanasi-221005, India. manoj_vns2005@yahoo.co.in., Ganesan V; Department of Chemistry, Banaras Hindu University, Varanasi-221005, India. manoj_vns2005@yahoo.co.in., Hira SK; Department of Zoology, Banaras Hindu University, Varanasi-221005, India., Manna PP; Department of Zoology, Banaras Hindu University, Varanasi-221005, India., Bharti A; Department of chemistry, Kirori Mal College, University of Delhi, Delhi-110007, India., Butcher RJ; Department of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, USA. |
| Abstrakt: |
The electrochemical water splitting by transition metal complexes is emerging very rapidly. The nickel complexes also play a very vital role in various biological activities. Here, three new ligands {H 2 mbhce = N '-(4-methyl-benzoyl), H 2 pchce = N '-(pyridine-carbonyl) and H 2 hbhce = N '-(2-hydroxy-benzoyl) hydrazine carbodithioic acid ethyl ester} and their corresponding Ni(II) complexes [Ni(Hmbhce) 2 (py) 2 ] (1), [Ni(pchce)( o -phen) 2 ]·CH 3 OH·H 2 O (2) and [Ni(hbhce)( o -phen) 2 ]·1.75CHCl 3 ·H 2 O (3) have been synthesized and fully characterized by various physicochemical and X-ray crystallography techniques. The photoluminescence study and thermal degradations were also examined. The treatment of K562 cells with the increasing concentrations of the nickel salts, ligands, and complexes 1, 2, and 3 showed dose-dependent cytotoxicity. The cytotoxic activity of ligands reveals that ligand H 2 mbhce is more potent in inhibiting the growth of tumor cells in comparison to other ligands H 2 pbhce and H 2 hbhce. Cytotoxicity assay results indicate that all complexes have remarkable cytotoxic potential in comparison to either nickel salts or the free ligands. Among these complexes, complex 1 has significantly better anti-tumor activity as compared to complexes 2 and 3. The electrochemical study of complexes 1, 2, and 3 for water oxidation reveals that all the complexes possess admirable electrocatalytic activity towards oxygen evolution reaction (OER) and have lower overpotential (328, 338, and 370 mV, respectively) than many previously reported complexes and RuO 2 (390 mV). Among complexes 1, 2, and 3, complex-2 shows a better water oxidation response. Consequently, these complexes have great potential to be utilized in fuel cells. The more reliable electrochemical parameter TOF is also calculated for all three complexes. |
