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A seven-coordinated manganese(II) complex with V-shaped ligand bis(N-benzylbenzimidazol-2-ylmethyl)benzylamine: synthesis, structure, DNA-binding properties and antioxidant activities.

Journal of photochemistry and photobiology. B, Biology (2012-09-29)
Huilu Wu, Jingkun Yuan, Ying Bai, Hua Wang, Guolong Pan, Jin Kong
ABSTRACT

A manganese(II) complex of the type, [MnL(pic)(2)]·H(2)O, was obtained by the reaction of the V-shaped ligand bis(N-benzylbenzimidazol-2-ylmethyl)benzylamine (L) with Mn(pic)(2) (pic=picrate). The ligand L and Mn(II) complex were confirmed on the basis of elemental analysis, molarconductivities, (1)H NMR, IR, UV-vis spectra and X-ray crystallography. Single-crystal X-ray revealed that central Mn(II) atom is seven-coordinate with a MnN(3)O(4) environment, in which ligand L acts as a tridentate N-donor. The remaining coordination sites were occupied by four O atoms afforded by two picrate anion. Interaction of the free ligand L and Mn(II) complex with DNA were investigated by spectrophotometric methods and viscosity measurements. The results suggested that both ligand L and Mn(II) complex bind to DNA in an intercalative binding mode, and DNA-binding affinity of the Mn(II) complex is stronger than that of ligand L. Moreover, antioxidant assay in vitro shows the Mn(II) complex possesses significant antioxidant activities.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Benzylamine, ReagentPlus®, 99%
Sigma-Aldrich
Benzylamine, purified by redistillation, ≥99.5%
Sigma-Aldrich
Benzylamine hydrochloride
Supelco
Benzylamine, for GC derivatization, LiChropur, ≥99.0%