Self-Assembled Zn(II) Coordination Complexes Based on Mixed V-Shaped Asymmetric Multicarboxylate and N-Donor Ligands

Hydrothermal reaction between Zn(OAc)2·2H2O and three asymmetric semirigid V-shaped multicarboxylate ligands H3L1–3 with the help of a 4,4'-bipyridine (4,4'-bpy) or 1,4-bis(imidazol-1-ylmethyl)benzene (bix) linker led to the isolation of six new coordination polymers, including [Zn3(L1)2(4,4′-bpy)2]n·(H2O)2n (1), [Zn3(L2)2(4,4′-bpy)(H2O)2]n·(H2O)2n (2), [Zn3(L3)2(4,4′-bpy)2(H2O)4]n·(H2O)6n (3), [Zn3(L1)2(bix)3]n·(H2O)7n (4), [Zn3(L2)2(bix)3]n·(H2O)4n (5), and [Zn3(HL3)2(bix)2]n (6), where H3L1, H3L2, H3L3 ligands represent 3-(2-carboxyphenoxy)phthalic acid, 4-(2-carboxyphenoxy)phthalic acid, 3-(4-carboxyphenoxy)phthalic acid, respectively. Single crystal X-ray diffraction analysis reveals a three-dimensional (3D) network for 1 and 3–5 but a two-dimensional (2D) structure for 2 and 6. Despite the construction from the polymetallic chains connected by the 4,4′-bpy ligands for both compounds 1 and 2, a 3D architecture was revealed for the former species while a 2D configuration for the latter one. Complex 3 ...