Syntheses, structures, magnetic properties and luminescence of four coordination polymers based on an asymmetric semirigid tricarboxylate ligand

In this work, four new complexes, [Mn(mu(3)-Hcpoia)(phen)(H2O)](n) 1, [Mn-2(mu(4)-Hcpoia)(2)(mu(2)-bib)(H2O)(2)](n) 2, [Zn(mu(2)-Hcpoia)(phen)(H2O)](n) 3, and [Zn-2(mu(2)-Hcpoia)(2)(mu(2)-4,4'-bpy)(H2O)(2)](n)center dot 2nH(2)O 4 (H(3)cpoia = 4-(4-carbox-yphenoxy)isophthalic acid, phen = phenanthroline, bib = 1,4-di(1H-imidazol-1-yl)benzene, 4,4'-bpy = 4,4'-bipyridine) have been synthesized by solvothermal reactions. Complexes 1-4 were fully characterized by IR spectroscopy, elemental analyses, thermogravimetric analyses, powder and single-crystal X-ray diffraction. Complexes 1 and 2 present two-dimensional (2D) structures based on the dinuclear Mn(II) secondary building units with the vertex symbols of (4.8(2)) and (3(2).4(4))(3(4).4(6).6(4).7), respectively. Complex 3 possesses one-dimensional (1D) structure and reveals a uninodal 2-connected chain with the 2C1 topology. Complex 4 exhibits a 1D ladder-like double chain, containing a 1D metal-organic chain interconnected by the 4,4'-bpy ligand with the vertex symbol of (4(2).6). Such a rich structural diversity of 1-4 is driven by various factors, including the type of the metal(II) ions and the ancillary ligands, as well as the coordination mode of ligand. Complexes 1 and 2 show antiferromagnetic interactions (J = -0.719 cm(-1) for 1, and J = -6.981 cm(-1) for 2) in dimeric units with the Mn-Mn distances of 4.451(1) and 3.151(5) angstrom, respectively, that are related to double syn-anti carboxylate bridges and four bis-bidentate carboxylate groups with syn-syn and mu-oxo modes. The solid-state luminescent behaviors of 3,4 were also investigated systematically.