Synthesis, crystal structures and selective luminescence sensing property of Zn(II) coordination polymers based on semi-rigid tricarboxylic acid ligands

• Published in: Journal of molecular structure 2022-09, Vol.1263, p.133162, Article 133162
• Main Authors: Hasi, Qi-Meige, Su, Xiao-Hong, Mu, Xiao-Tong, Wei, Yu-Mei
• Format: Article
• Language: English
• Subjects: Anions; Coordination polymer; Fluorescence recognition; Metal cations; Organic small molecules; Semi-rigid tricarboxylic acid ligand
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2022.133162

•Two novel Zn-based coordination polymers exhibited a 1D chain structures.•Two novel coordination polymers showed excellent fluorescence performances.•1 presents selectively response to Ni2+, Cr2O72–, nitrobenzene and nitromethane.•2 presents selectively response to Ni2+, MnO4−, nitrobenzene and nitromethane. Herein, two novel Zn-based coordination polymers [Zn(HL)(1,10-phen)(H2O)]n (1) and [Zn2(HL)2(2,2′-bipy)2]n (2) have been successfully synthesized via solvothermal method by using the semi-rigid tricarboxylic acid ligand (H3L:3-[(1-carboxynaphthalen-2-yl)oxy] phthalic acid) and two different nitrogen-containing heterocyclic ligands (1,10-phenanthroline, 2,2′-bipyridine). A single-crystal X-ray analysis reveals that these two novel Zn-based coordination polymers 1 and 2 exhibit a one dimensional (1D) chain structures. Moreover, two novel Zn-based coordination polymers 1 and 2 exihit excellent fluorescence performances, and selectively recognition response to Ni2+, MnO4−, Cr2O72−, nitrobenzene and nitromethane through the luminescence quenching effects in aqueous solutions. The possible fluorescence recognition mechanism of 1 and 2 toward Ni2+, MnO4−, Cr2O72- are investigated, which may be attribute to the synergistic effects of energy competitive absorption and weak interaction. Whereas the fluorescence quenching behaviors of 1 and 2 toward nitrobenzene and nitromethane, owing to the existence of a strong electron-withdrawing group which can obtain excited-state electrons, and leading to the occurence of electrons transfer. These results indicating that Zn-based coordination polymers have potential application values in fluorescent recognition. Two novel Zn-based coordination polymers exihit excellent fluorescence performances, and selectively recognition response to Ni2+, MnO4−, Cr2O72−, nitrobenzene and nitromethane through the luminescence quenching effects inaqueous solutions. [Display omitted]