Syntheses and crystal structures of [Mn(H2O)4(bpy)]L · 4H2O, [Mn(H2O)4(bpy)]L′ · 4H2O and [Zn(H2O)4(bpy)]L · 4H2O (H2L = succinic acid, H2L′ = fumaric acid)

Abstract

Reactions of freshly prepared M(OH)2 − 2 x (CO3) x · yH2O (M = Mn, Zn) and 4,4′-bipyridine (bpy) with succinic acid (H2L) or fumaric acid (H2L′) in CH3OH–H2O afforded [Mn(H2O)4(bpy)]L · 4H2O, 1, [Mn(H2O)4(bpy)]L′ · 4H2O, 2 and [Zn(H2O)4(bpy)]L · 4H2O, 3. The three coordination polymers are isostructural and consist of [M(H2O)4(bpy)2/2]2+ cationic chains, crystal H2O molecules and dicarboxylate anions (succinate or fumarate anions). Within the chains, the metal atoms are each octahedrally coordinated by four aqua oxygen atoms and two pyridyl nitrogen atoms from two 4,4′-bipyridine ligands. The crystal H2O molecules are hydrogen bonded to dicarboxylate anions to form ribbon-like anionic chains. The cationic and anionic chains are interconnected via hydrogen bonds to generate a 3D network. Crystal data: 1 triclinic, , a = 7.235(1), b = 7.749(2), c = 10.020(2) Å, α = 79.95(3), β = 88.79(3), γ = 71.39(3)°, V = 523.9(2) Å3 and D cal = 1.494 g cm−3 for Z = 1; 2 triclinic, , a = 7.127(1), b = 7.800(2), c = 9.945(2) Å, α = 80.26(3), β = 87.86(3), γ = 72.69(3)°, V = 520.2(2) Å3 and D cal = 1.498 g cm−3 for Z = 1; 3 triclinic, , a = 7.189(1), b = 7.764(2), c = 9.843(2) Å, α = 79.16(3), β = 87.80(3), γ = 71.29(3)°, V = 510.9(2) Å3 and D cal = 1.559 g cm−3 for Z = 1.