Weakly antiferromagnetic vanillin and acetate bridged dinuclear Ni(ii) compound exhibiting catecholase-like activity and biological properties
NEW JOURNAL OF CHEMISTRY（2024）
Abstract
A dinuclear nickel compound that features vanillin (van) and acetate (OAc) bridging ligands, [Ni-2(mu-van)(2)(mu-OAc)(NCS)(3)(H2O)]5H(2)O 1, was synthesized and characterized using various techniques. Crystal structure analysis revealed a pair of Ni(ii) ions bridged by an acetate anion through a mu(2)-eta(1):eta(1) coordination mode. At the same time, vanillin bridges both nickel(ii) centers through phenolic oxygen, separating the two Ni ions by a distance of 3.001(7) & Aring;. The temperature-dependent magnetism indicates weak antiferromagnetic behaviour in compound 1, following the Curie-Weiss law with Curie constant C = 1.0145 cm(3) K mol(-1) and Weiss constant theta = -4.1 K. Compound 1 was evaluated for its ability to mimic the catechol oxidase enzyme using 3,5-di-tert-butylcatechol as a model substrate with a K-cat value of 157.1 x 10(2) h(-1). Furthermore, compound 1 was tested for its cytotoxicity against HepG2 cancer cells and DNA cleavage properties.
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