A three-dimensional Zn II coordination network based on 5,5'-methylenebis(2,4,6-trimethylisophthalic acid) and 2,7-bis(1H-imidazol-1-yl)fluorene: synthesis, structure and luminescence properties

• Published in: Acta crystallographica. Section C, Structural chemistry Vol. 75; no. Pt 1; p. 8
• Main Authors: Chen, Zhen, Sun, Yanwen, Liu, Zi An, Wang, Ning, Yang, Xue, You, Xiaomeng, Wang, Xiaozhong
• Format: Journal Article
• Language: English
• Published: England 01.01.2019
• Subjects: hydrogen bonding; supramolecular; two-dimensional coordination polymer; crystal structure; 2,7-bis(1H-imidazol-1-yl)fluorene; 5,5′-methylenebis(2,4,6-trimethylisophthalic acid; zinc(II); fluorescence properties
• ISSN: 2053-2296
• DOI: 10.1107/S2053229618016285

In recent years, coordination polymers constructed from multidentate carboxylate ligands and N-containing ligands have attracted much attention since these ligands can adopt a rich variety of coordination modes which can lead to crystalline products with intriguing structures and interesting properties. A new coordination polymer, namely poly[[diaqua[μ-2,7-bis(1H-imidazol-1-yl)fluorene-κ N :N ][μ-5,5'-methylenebis(3-carboxy-2,4,6-trimethylbenzoato)-κ O :O ]zinc(II)] hemihydrate], {[Zn(C H O )(C H N )(H O) ]·0.5H O} , 1, was prepared by the self-assembly of Zn(NO ) ·6H O with 5,5'-methylenebis(2,4,6-trimethylisophthalic acid) (H BTMIPA) and 2,7-bis(1H-imidazol-1-yl)fluorene (BIF) under solvothermal conditions. The structure of 1 was determined by elemental analysis, single-crystal X-ray crystallography, powder X-ray diffraction, IR spectroscopy and thermogravimetric analysis. Each Zn ion is six-coordinated by two O atoms from two H BTMIPA ligands, by two N atoms from two BIF ligands and by two water molecules, forming a distorted octahedral ZnN O coordination geometry. Adjacent Zn ions are linked by H BTMIPA ligands and BIF ligands, leading to the formation of a two-dimensional (2D) (4,4)-sql network, and intermolecular hydrogen-bonding interactions connect the 2D layer structure into the three-dimensional (3D) supramolecular structure. Each 2D layer contains two kinds of helices with the same direction, which are opposite in adjacent layers. The luminescence properties of complex 1 in the solid state have also been investigated.