Copper(II) coordination polymers constructed from aromatic polycarboxylate and flexible triazole ligands with different spacer lengths: syntheses, structures, and properties

Abstract

{[Cu2(btm)2(Hbtc)(H2btc)2(H2O)]·9.5H2O}n (1), [Cu(bte)(H2btc)2]n (2) {[Cu(btp)(H2btc)2]·0.25H2O}n (3) (btm = bis(1,2,4-triazol-1-yl)methane, bte = bis(1,2,4-triazol-1-yl)ethane, btp = bis(1,2,4-triazol-1-yl)propane, H3btc = benzene-1, 3, 5-tricarboxylic acid) have been synthesized and structurally characterized. 1 features a 1-D double chain, which is interconnected by classical hydrogen-bonding (O–H⋯O) and π–π interactions to lead to a 3-D supramolecular architecture. 2 and 3 are both 1-D single chains, which are interconnected by π–π interactions to 2-D layer architectures. Elemental analysis, XRD, IR, TG and EPR spectra have been carried out and discussed.