Synthesis,Crystal Structure and Luminescence Study of a New Two-dimensional Mn(Ⅱ) Coordination Polymer

The coordination polymer Mn_2(cipt)_2(aic)_2]_n(cipt = 2-(3-chlorophenyl)-1Himidazo4,5-f]1,10]phenanthroline, aic = 5-amino-isophthalic acid) has been obtained from hydrothermal reaction and characterized by elemental analysis, IR, TG and single-crystal X-ray diffraction. The title compound crystallizes in the triclinic system, space group P1, with a = 11.523(3), b = 12.162(3), c = 18.706(5) ?, β = 81.789(5)o, V = 2455.2(1) ?3, C_(54)H_(32)Cl_2Mn_2N_(10)O_8, Mr = 1129.68, Z = 2, Dc = 1.528 g/cm3, μ = 0.692 mm-1, F(000) = 1148, R = 0.064 and wR = 0.145 for 9571 observed reflections(I 2σ(I)). In this polymer, the Mn(Ⅱ) atoms adopt different coordination modes. The Mn(1) atom is five-coordinated, forming a distorted tetragonal pyramidal geometry. Mn(2) atom is six-coordinated to get a distorted octahedral geometry, which is different from the Mn(1) atom. Each Mn(Ⅱ) atom is linked by aic ligands with neighboring Mn(Ⅱ) atoms, forming an infinite one-dimensional(1D) double-chain structure. The existence of N–H···O hydrogen bonding interactions leads the 1D chains to generate a 2D structure. Luminescent properties for the ligand cipt and compound 1 have also been discussed in detail.