Premium
Synthesis, crystal structure and biological properties of Cd and Zn coordination polymers based on a flexible tripodal ligand
Author(s) -
Wang Xia,
Ling Ning,
Li Hanbing,
Xiao Xiaohe,
Zhang Yawen
Publication year - 2019
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229619008714
Subject(s) - ligand (biochemistry) , tripodal ligand , coordination polymer , polymer , crystal structure , coordination complex , crystallography , chemistry , materials science , combinatorial chemistry , organic chemistry , metal , receptor , biochemistry
Two new coordination polymers, namely poly[[hexathiocyanatotetrakis{μ 3 ‐2,4,6‐trimethyl‐1,3,5‐tris[(triazol‐1‐yl)methyl]benzene}tricadmium(II)] 3.5‐hydrate], {[Cd 3 (SCN) 6 (C 18 H 21 N 9 ) 4 ]·3.5H 2 O} n ( 1 ), and poly[[hexathiocyanatotetrakis{μ 3 ‐2,4,6‐trimethyl‐1,3,5‐tris[(triazol‐1‐yl)methyl]benzene}trizinc(II)] 3.5‐hydrate], {[Zn 3 (SCN) 6 (C 18 H 21 N 9 ) 4 ]·3.5H 2 O} n ( 2 ), have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR spectroscopy and single‐crystal X‐ray diffraction analysis. From the X‐ray analysis, it is noteworthy that polymers 1 and 2 are isostructural, with their three‐dimensional structures composed of three kinds of four‐connection metal ions and two kinds of three‐connection 2,4,6‐trimethyl‐1,3,5‐tris[(triazol‐1‐yl)methyl]benzene (TTTMB) ligand nodes. Each metal ion is six‐coordinated in a slightly distorted octahedral geometry. The antioxidant activity against DPPH (2,2‐diphenyl‐1‐picrylhydrazyl) and the antidiabetic activity against α‐amylase of the synthesized compounds were evaluated in vitro . The results of the DPPH free‐radical scavenging assay showed that polymers 1 and 2 exhibited strong antioxidant effects, with IC 50 values of 3.81 and 2.56 mg ml −1 , respectively. The IC 50 value in the antidiabetic studies of polymer 1 was 3.94 mg ml −1 , while polymer 2 exhibited no antidiabetic activity. Polymers 1 and 2 revealed different inhibitory activities on DPPH and α‐amylase, which indicated that the metal ions play important roles in the biological activity of coordination polymers. In addition, the solid‐state photoluminescence properties and thermal stability of 1 and 2 have been investigated.