Syntheses, structures and photocatalytic properties of three copper(II) coordination polymers

Three coordination polymers [Cu-2(obtz)(2)(tdc)(2)](n) (1), {[Cu(obtz)(2)(H2O)(2)]center dot[Cu-2(obtz)(2)(sip)(2)]center dot 5.5H(2)O}(n) (2) and [Cu(obtz)(nip)], (3) were synthesized by the hydrothermal reaction (obtz = 1.2-bis(1,2,4-triazol-1-ylmethyl)benzene, tdc = 2.5-thiophenedicarboxylate, sip = 5-sulfoisophthalate, nip = 5-nitroisophthalate). 1 shows a ladder-like one-dimensional chain with two side arms. 2 is comprised of two distinct and crystallographically independent polymeric motifs. The first motif in 2 is the ladder-like one-dimensional anionic chain with two side arms. The second motif in 2 is the cationic chain. 3 exhibits the intriguing 2-fold interpenetrated network based on the undulated 2D (4.4) network 1, 2 and 3 are good photocatalysts for the degradation of methyl orange (MO) under UV irradiation. (C) 2016 Elsevier B.V. All rights reserved.