Syntheses, structures and properties of two zinc coordination polymers based on bis(triazole) and sulfoisophthalate

Abstract

Two zinc(II) coordination polymers {[Zn(tmtz)(H₂O)₄][Zn₂(tmtz)₂(sip)₂]·3H₂O}_n (1) and [Zn₃(tmtz)₂(sip)₂(H₂O)₄]·2H₂O}_n (2) (tmtz = 1,4-bis(1,2,4-triazol-1-ylmethyl)-2,3,4,5-tetramethylbenzene, sip = 5-sulfoisophthalate) were synthesized and structurally characterized. X-ray structural analysis shows that 1 is comprised of two distinct and crystallographically independent polymeric motifs polythreading together. The first motif of 1 is the (3,5)-connected 3D anionic network [Zn₂(tmtz)₂(sip)₂]_n²ⁿ⁻ with point symbol of (4²·6)(4²·6⁵·8³). The second motif in 1 is the [Zn(tmtz)(H₂O)₄]_n²ⁿ⁺ 1D cationic chain. A polythreading array was formed by a (3,5)-connected 3D anionic network and 1D cationic chains in 1. 2 exhibits a (3,4)-connected 2D network with point symbol of (4²·8)(4²·6·8²·10) and constructs a 3D hydrogen bonding architecture. 1 and 2 are effective catalysts for the degradation of methyl orange in the presence of H₂O₂. The luminescence and thermal analyses are also performed.