Syntheses, structural diversity and properties of a series of coordination polymers based on 4-substituted bis(triazole) and multicarboxylate ligands

Abstract

Seven coordination polymers, {[Co(btrb)(MeOip)]·H2O}n (1), [Co(btrb)0.5(NH2ip)(H2O)]n (2), [Cu(btrb)0.5(NH2ip)(H2O)]n (3), {[Co3(btrb)1.5(Meip)3(H2O)]·3H2O}n (4·3H2O), [Zn(btrb)0.5(1,4-bdc)]n (5), [Zn2(btrb)0.5(Meip)2]n (6) and {[Zn2(OH)(btrb)0.5(btc)(H2O)]·4H2O}n (7·4H2O) (btrb = 1,4-bis(1,2,4-triazole-4-ylmethyl)benzene, H2MeOip = 4-methoxyisophthalic acid, H2NH2ip = 5-aminoisophthalic acid, H2Meip = 5-methylisophthalic acid, 1,4-H2bdc = terephthalic acid, H3btc = 1,3,5-benzenetricarboxylic acid), were synthesized and characterized. 1 shows a 4-connected 3D cds network. 2 and 3 exhibit a (3,4)-connected 2D network with the point symbol (42·6)(42·63·8). 4 presents a 6-connected 3D network based on a [Co3(COO)3] trimeric cluster with the point symbol (48·54·63). 5 exhibits a 3-fold interpenetrated pcu network based on a [Zn2(COO)2] dimer. 6 shows a 2-fold interpenetrated pcu topology based on a [Zn4(COO)6] tetramer. 7 shows a rare (3,8)-connected network based on [Zn4(μ3-OH)2] clusters with the point symbol (4·5·6)2(42·56·616·72·82). The photocatalytic properties of 1, 3 and 4 and the solid-state photoluminescence properties of 5–7 were investigated.