Syntheses, structures and properties of two coordination polymers based on 3, 5-di(4H-1, 2, 4-triazol-4-yl)benzoic acid with multicarboxylates as mixed ligands. (17th June 2017)

• Record Type: Journal Article
• Authors: Jiang, Wen-Hong; Liu, Bin; Yu, Ying-Hui; Hou, Guang-Feng; Ma, Dong-Sheng
• Is Part Of: Polyhedron. Volume 129(2017)
• Page Start: 208
• Page End: 213
• Publication Date: 2017-06-17
• Subjects: Crystal structure -- Triazole -- Interpenetration -- Fluorescence quenching -- Auxiliary ligands; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2017.03.041
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Two aromatic multicarboxylic acids, 1, 4-benzenedicarboxylic acid (H2 p -BDC) and 1, 2, 3-benzenetricarboxylic acid (1, 2, 3-H3 BTC), are adopted as mixed ligands with 3, 5-di(4H-1, 2, 4-triazol-4-yl)benzoic acid (HL) and Zn(NO3 )2 ·6H2 O, constructing two coordination polymers, 1 and2 . The fluorescence of1 and2 could be quenched by nitroaromatics (NACs), indicating their potential application as sensory materials. Abstract: Two zinc coordination polymers, namely {[Zn6 (L)6 ( p -BDC)3 ]·4(H2 O)} n (1 ) and {[Zn2 (H2 O)3 (L)(1, 2, 3-BTC)]} n (2 ) {HL = 3, 5-di(4H-1, 2, 4-triazol-4-yl)benzoic acid, H2 p -BDC = 1, 4-benzenedicarboxylic, 1, 2, 3-H3 BTC = 1, 2, 3-benzenetricarboxylic acid}, were synthesized under solvothermal conditions. Single-crystal X-ray analyses show that complex1 exhibits two-dimensional (2D) double-layered 3, 4L88 nets, which further generate a 2D → 3D supramolecular structure. Complex1, with H2 p- BDC as the mixed ligand, owns a interpenetrated structure with the (6 3 )(6 6 )4 (6 9 ·8) topology built by π–π interactions. When the mixed ligand is changed from the dicarboxylate H2 p- BDC to the tricarboxylate 1, 2, 3-H3 BTC in complex2, each [L] − anion in2 acts as a tridentate ligand, linking three Zn(II) ions, and each [1, 2, 3-BTC] 3− anion in2 links four Zn(II) ions. Consequently, a different (3·4 2 )(3·4 3 ·5·6)(3 2 ·4 3 ·5 4 ·6 7 ·7 3 ·8 2 )(3 2 ·4 4 ·5 3 ·6 4 ·7 2 ) topological network is formed in complex2 . The two complexes have also been characterized by elemental analysis, infrared spectroscopy, powder X-ray diffraction and thermogravimetry measurements. It is also found that the fluorescence of complexes1 and2 could be quenched by nitroaromatics (NACs), indicating their potential application as sensory materials.