Rational synthesis of an ultra-stable Zn(ii) coordination polymer based on a new tripodal pyrazole ligand for the highly sensitive and selective detection of Fe3+ and Cr2O72− in aqueous media

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 49; no. 32; pp. 11201 - 11208
• Main Authors: Shi-Hui, Zhang, Shu-Yu, Zhang, Jing-Rong, Li, Zhen-Qi, Huang, Yang, Jing, Ke-Fen Yue, Yao-Yu, Wang
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 28.08.2020
• Subjects: Acid resistance; Aqueous solutions; Benzene; Coordination polymers; Crystallography; Ferric ions; Ligands; Luminescence; Luminescence quenching; Optical properties; Pyrazole; Query languages; Selectivity; Structural stability; Thermal decomposition; Thermal stability; Water resistance
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d0dt01996h

A mixed-ligand strategy has been used to construct stable luminescent coordination polymers (CPs). An ultra-stable Zn(ii) coordination polymer, [Zn(H3tpb)(Hbtc)]n (1) was hydrothermally synthesized by employing a new tripodal pyrazole ligand H3tpb and a classical carboxylic ligand H3btc (H3tpb = 1,3,5-tris(pyrazolyl)benzene, H3btc = 1,3,5-benzenetricarboxylic acid). Complex 1 exhibits a 2D sql network. Importantly, 1 not only possesses excellent thermal stability but also shows superior chemical stability in terms of water resistance, acid/base aqueous solutions tolerance (pH = 2–12), and organic solvents resistance. This excellent structural stability was further illustrated from the perspective of thermal decomposition kinetics. The luminescence properties were investigated, showing that complex 1 displays high sensitivity and selectivity for detecting Fe3+ and Cr2O72− ions in aqueous solutions via luminescence quenching effects.