pH-Directed assembly of two 2D copper(II) coordination polymers based on mixed benzenetetracarboxylate and 1,4-bis(1,2,4-triazole-1-ylmethyl)-2,3,5,6-tetrafluorobenzene ligands: syntheses, structures and properties

Two new Cu(II) coordination polymers [Cu(Fbtx)(H(2)btec)(H2O)(2)](n) and {[Cu(Fbtx)(btec)(0.5)(H2O)(2)]center dot H2O} n have been synthesised by hydrothermal reactions of Cu(II) nitrate with 1,4-bis(1,2,4-triazole-1-ylmethyl)-2,3,5,6-tetrafluorobenzene (Fbtx) and 1,2,4,5-benzenetetracarboxylic acid (H(4)btec) under different pH conditions. The first complex has a two-dimensional four-connected layer structure with a 4(4)-sql topology, whereas the second has a two-dimensional three-connected brick-wall network. The luminescence properties of the complexes in the solid state and their thermal stabilities have also been studied.