Synthesis and structure of coordination polymers of Mn2+, Cu2+, Ag+, Zn2+ and Cd2+ by combination of bipyrazole and diphenate ligands

Five new coordination polymers, [ Mn ( DPA ) ( Me 4 bpz ) ( H 2 O ) ] ( I ) ∞ 1 , [ Cu ( DPA ) ( Me 4 bpz ) 2 ] · H 2 O ( II ) ∞ 1 , [ Ag 4 ( OAc ) 2 ( Me 4 bpz ) 3 ( H 2 O ) 1.56 ] ( III ) ∞ 2 , [ Zn ( DPA ) ( Me 4 bpz ) ] · 0.61 H 2 O ( IV ) ∞ 3 and [ Cd ( DPA ) ( Me 4 bpz ) ] ( V ) ∞ 3 [DPA: diphenic acid dianion, OAc: acetate, Me4bpz: 3,3′,5,5′-tetramethyl-4,4′-bipyrazole], were obtained from acetate hydrates of Mn2+, Cu2+, Ag+, Zn2+ and Cd2+ and a mixed ligand system consisting of Me4bpz and diphenic acid by hydrothermal synthesis under similar conditions. Their crystal structures were determined by means of X-ray single crystal structure analysis. Furthermore, the compounds were characterized by means of elemental analysis and IR spectroscopy. The polymers I and II exhibit one-dimensional chain structures with only one type of bridging ligand, whereas the polymers IV and V realize three-dimensional coordination frameworks with diamond topology involving both ligand types as bridging ligands. Compound III contains a two-dimensional cationic framework which is charge compensated by acetate anions. The coordination environments of the metal centers are predominant directly supported by N–H ⋯ O hydrogen bonds providing further evidence for the bipyrazole-carboxylate supramolecular synthon.