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Dinuclear nickel(II) complexes with Schiff base ligands: syntheses, structures and bio-relevant catalytic activities |
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| Authors: | Arpita Banerjee Averi Guha Pali Maiti Somen Goswami Tanmay Chattopadhyay Tapan Kumar Mondal Santanu Bhattacharya Ennio Zangrando Debasis Das |
| Affiliation: | 1. Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata, 700009, India 5. Department of Chemistry, Panchakot Mahavidyalya, Neturia, Purulia, 723121, India 2. Department of Chemistry, Jadavpur University, Jadavpur, Kolkata, 700032, India 3. Department of Chemistry, Maharaja Manindra Chandra College, Kolkata, 700003, India 4. Dipartimento di Scienze Chimiche, University of Trieste, Via L. Giorgieri 1, 34127, Trieste, Italy |
| Abstract: | Three Ni(II) complexes of cresol-based Schiff-base ligands, namely [Ni2(L1)(NCS)3(H2O)2], (1) [Ni2(L2)(CH3COO)(NCS)2(H2O)] (2) and [Ni2(L3)(NCS)3] (3), (where L1 = 2,6-bis(N-ethylpyrrolidineiminomethyl)-4-methylphenolato, L2 = 2,6-bis(N-ethylpiperidineiminomethyl)-4-methylphenolato and L3 = 2,6-bis{N-ethyl-N-(3-hydroxypropyl iminomethyl)}-4-methylphenolato), have been synthesized and structurally characterized by X-ray single-crystal diffraction in addition to routine physicochemical techniques. Density functional theory calculations have been performed to understand the nature of the electronic spectra of the complexes. Complexes 1?C3 when reacted with 4-nitrophenyl phosphate in 50:50 acetonitrile?Cwater medium promote the cleavage of the O?CP bond to form p-nitrophenol and smoothly convert 3,5-di-tert-butylcatechol (3,5-DTBC) to 3,5-di-tert-butylquinone (3,5-DTBQ) either in MeOH or in MeCN medium. Phosphatase- and catecholase-like activities were monitored by UV?Cvis spectrophotometry and the Michaelis?CMenten equation was applied to rationalize all the kinetic parameters. Upon treatment with urea, complexes 1 and 2 give rise to [Ni2(L1)(NCS)2(NCO)(H2O)2] (1??) and [Ni2(L2)(CH3COO)(NCO)(NCS)(H2O)] (2??) derivatives, respectively, whereas 3 remains unaltered under same reaction conditions. |
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