Syntheses, crystal structures and characterization of two new Pb(II) and Cu(II) coordination polymers based on 2-(4-fluorophenyl)-1H-imidazo[4,5-f][1,10] phenanthroline and benzenedicarboxylate ligands

摘要

Two new coordination polymers, [Pb(L)(1,3-bdc)] 2.5H_2O (1) and [Cu(L)(1,4-bdc)] (2) (L = 2-(4-fluorophenyl)-1H-imidazo[4,5-f][1,10] phenanthroline; 1,3-bdc, 1,4-bdc = 1,3-and 1,4-benzenedicarboxylate), have been hydrothermally synthesized and characterized by elemental analysis, IR spectra and single-crystal X-ray diffraction. Crystal data for 1: C_(54)H _(40)F_2N_8O_(13)Pb_2, triclinic, space group P1?, a = 9.3468(19), b = 9.4607(14), c = 15.581(3) ?, α = 90.44(4), β = 101.13(3), γ = 113.97(3)°, V = 1229.6(4) A~3, Z = 1. Crystal data for 2: C_(27)H_(15)CuFN _4O_4, triclinic, space group P 1?, a = 9.640(6), b = 10.941(8), c = 11.865(5) ?, α = 62.694(4), β = 69.776(3), γ= 79.915(5)°, V = 1043.2(11) ?~3, Z = 2. In 1, the Pb(II) atoms are bridged by the 1,3-bdc ligands to yield a chain structure. The ligands L are only located on one side of the chain, where π...π interactions among neighboring chains result in a supramolecular ladder, and the O-H... O hydrogen bonding interactions further stabilize this structure. Compound 2 shows a layer structure, with stacking by π-π interactions to give a three-dimensional (3D) supramolecular architecture. N-H...O hydrogen bonding further stabilizes the structure of 2.