Amine-directed structural studies of four zinc metal-organic frameworks based on a novel phosphonocarboxylate ligand

A novel phosphonocarboxylic ligand, 4'-phosphonobiphenyl-3,5-dicarboxylic acid (H(4)pbpdc), was synthesized to construct 4 zinc compounds, namely, {(Zn-3(pbpdc)(2)center dot 2R}(n) (R = C5H12N for 1. C4H10N for 2 and C6H16N for 3) and ([Zn(2)pbpdc]center dot C6H18N3}(n) (4), which were characterized by X-ray crystallography, elemental analysis, FTIR and TG. Structures 1 similar to 3 have the same 3-dimensional (3-D) frameworks with point symbol of {4.6.7(3).8)(2) {4(2).6.7(2).8}(2){4(2).6(2).7.8}(2){4(2).6(2).7(2)}. Structure 4 is constructed from a 6-connected metallic cluster and 3-connected phosphonocarboxylic building units resulting in a topology of flu-3,6-C2/c. The luminescent properties of compounds 1 similar to 4 and organic ligand were studied. (C) 2013 Elsevier B.V. All rights reserved.