Solvent-regulated assemblies of four Zn(II) coordination polymers constructed by flexible tetracarboxylates and pyridyl ligands

Four unique complexes with diverse coordination architectures were synthesized upon complexation of 5,5-(1,4-phenylenebis (methylene))bis (oxy)- diisophthalic acid (H4L) with zinc ions by using different solvent. namely, {[Zn(H2L) (bpp)]center dot DEF}(n) (1), {[Zn-2(L) (bpp)(2)]center dot 4H(2)O}(n) (2), {[Zn-2(L) (pdp)(2)]center dot 3H(2)O center dot DEF}(n) (3), {[Zn-2(L) (pdp)(2)]center dot 4H(2)O}(n) (4). Complexes 1,2 and 3,4 are obtained by varying solvents to control their structures. The size of solvent molecular plays an important role to control different structure of these compounds. Compound 1 is 2D waved framework with (4, 4) grid layer as sql topology. Compound 3 displays a (4,6)-connected 2-nodal net with a fsc topology. Compounds 2 and 4 are all three-dimensional network simplified as (4,4)-connected 2-nodal net with a bbf topology. The photochemical properties of compounds 1-4 were tested in the solid state at room temperature, owing to their strong luminescent emissions, complexes 1-4 are good candidates for photoactive materials. (C) 2016 Elsevier B.V. All rights reserved.