Syntheses, structures, and properties of a series of new assembled metal complexes with 4-(benzimidazol-1-ylmethyl)benzoate

Abstract

A series of complexes based on 4-(benzimidazol-1-ylmethyl)benzoic acid (HL), [Co(L)₂]·H₂O (1), [Zn(L)₂]·H₂O (2), [Mn(L)₂(phen)]·H₂O (3), and [Mn₂(L)₂(phen)₄]·2ClO₄ (4) [phen = 1,10-phenanthroline], were synthesized under hydrothermal conditions and characterized by single-crystal and powder X-ray diffractions, IR, elemental, and thermogravimetric analyzes. HL features O-donor carboxylate and flexible N-donor benzimidazol-1-ylmethyl groups, allowing varied coordination and conformations. Complex 1 exhibits a uninodal 4-connected 2-D network structure with (4⁴.6²) topology. Complex 2 has a similar 2-D architecture to 1. Complex 3 consists of 2-D networks, displaying a uninodal 4-connected 2-D network with (4⁴.6²) topology. Complex 4 shows a dinuclear structure, which can be further linked to form a 2-D layer through interactions. The results imply that metal centers, auxiliary ligand, and counter anions subtly infiuence the structure of resultant complexes. In addition, the fluorescence of 2 and magnetism of 4 have been examined.

Keywords:

• Cobalt
• Zinc
• Manganese
• Metal-organic framework
• Properties

Acknowledgment

The authors gratefully acknowledge Huaian Administration of Science & Technology of Jiangsu Province of China (HAG2012022) for financial support of this work.