Anion-controlled Zn(ii) coordination polymers with 1-(tetrazo-5-yl)-3-(triazo-1-yl) benzene as an assembling ligand: synthesis, characterization, and efficient detection of tryptophan in water. Issue 48 (26th November 2021)

• Record Type: Journal Article
• Authors: Sun, Han-Xu; Zhou, Jie; Zhang, Zhen; He, Mei; He, Lian-Cheng; Du, Lin; Xie, Ming-Jin; Zhao, Qi-Hua
• Is Part Of: Dalton transactions. Volume 50:Issue 48(2021)
• Page Start: 18044
• Page End: 18052
• Publication Date: 2021-11-26
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt03045k
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The triazole/tetrazole N-donor ligand of Httb is rarely studied in the construction of CPs. A controlling effect of anions on supramolecular architectures has been observed. CP 2 has been proved to be the best tryptophan sensor. Abstract : Tryptophan regulates and participates in various physiological systems in the human body, and its excessive intake has harmful effects. Therefore, detecting and monitoring tryptophan in water and distinguishing it from other amino acids are necessary. In addition to their excellent luminescence, coordination polymer-based sensors have good stability and high sensitivity and selectivity for sensing applications. In this work, two luminescent coordination polymers (CPs), [Zn(ttb)Cl] n (1 ) and [Zn2 (ttb)2 (OH)(NO3 )] n (2 ), were obtained through the solvothermal reaction of different Zn(ii ) salts with a rarely studied multidentate N-donor ligand, 1-(tetrazo-5-yl)-3-(triazo-1-yl) benzene (Httb). Crystallographic investigations revealed that the structure of 1 exhibits a 2D fes net with Cl − anions acting as terminal charge balancers, and that of 2 features a 3D ant net with NO3 − anions in a rare monodentate bridging (μ2 -O-η 1 :η 1 ) mode. In terms of stability tests, 2 has better thermal and water stability than 1 . Although both show good fluorescence performance, specific tryptophan detection, and excellent anti-interference ability, 2 has higher K SV (111 852.6 M −1 ), a lower limit of detection (LOD = 23.6 nM), and a better recovery rate than 1 . Cytotoxicity experiments proved that 2 has extremely low toxicity and thus has great potential for in vivo detection. Therefore, CP 2 is a suitable candidate for advanced practical applications for the efficient sensing of tryptophan in water. The luminescence of the ligands was also calculated using DFT theory and further discussed through experiments. The quenching mechanism that occurs after tryptophan addition was explored through Hirshfeld surface analysis.