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Magnetic and catalytic properties of a new copper(II)-Schiff base 2D coordination polymer formed by connected helical chains |
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| Authors: | Dipali Sadhukhan,Ray J. Butcher,Bü lent Dede |
| Affiliation: | a Department of Chemistry, Jadavpur University, Raja S.C. Mullick Road, Kolkata 700032, West Bengal, India b Department of Chemistry, Howard University, 2400 Sixth Street, NW Washington, DC 20059, USA c Instituto de Ciencia Molecular ICMol, Universidad de Valencia, Parque Científico, 46980 Paterna, Spain d Faculty of Sciences and Arts, Chemistry Department, Süleyman Demirel University, 32260 Isparta, Turkey |
| Abstract: | A dicyanamide bridged 2D polynuclear complex of copper(II) having molecular formula [Cu2(L)(μ1,5-dca)2]n (1) has been synthesized using the Schiff base ligand N,N′-bis(salicylidene)-1,3-diaminopentane, (H2L) and sodium dicyanamide (dca). The complex presents a 2D hexagonal structure formed by 1,5-dca singly bridged helical chains connected through double 1,5-dca bridges. The chelating characteristics of the H2L Schiff base ligand results in the formation of copper(II) dimer with a double phenoxo bridge presenting a very strong antiferromagnetic coupling in the copper(II) derivative (1) (J = −510 cm−1). The dimeric asymmetric unit of 1 is very similar to the active site of the catechol oxidase and, as expected, also presents catalytic activity for the oxidation of 3,5-di-tert-butylcatechol to 3,5-di-tert-butylquinone in presence of O2, as demonstrated by kinetic studies of this oxidation reaction monitored by absorption spectroscopy resulting in high turnover number (Kcat = 259 h−1). |
| Keywords: | 2D coordination polymer Helical chains Copper(II)-Schiff base complex Antiferromagnetic interaction Catecholase activity |
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