Syntheses, Structures and Characterization of Two Ni(II) and Pb(II) Coordination Polymers Constructed by 2-(4-Fluorophenyl)-1Himidazo[ 4,5-f][1,10]phenanthroline and Flexible 4,4’-Oxybis(benzoate) Ligands

Abstract

Two coordination polymers, [Ni(H2O)(L)(OBA)] (1) and [Pb(L)2(OBA)]·3H2O (2) [L=2- (4-fluorophenyl)-1H-imidazo[4,5- f ][1,10]phenanthroline and OBA=4,4’-oxybis(benzoate)], have been synthesized under hydrothermal conditions, and characterized by elemental analysis, and IR and UV=Vis spectra. Crystal data for 1: C33H21FN4NiO6, triclinic, space group P1̅, a=13.8490(10), b=14.932(2), c=14.993(3) Å, α =107.534(4), β =94.670(4), γ =103.836(5)°, V =2830.9(7) Å3, Z =4. Crystal data for 2: C52H36F2N8O8Pb, orthorhombic, space group Pna21, a=16.256(4), b=16.085(5), c=17.810(3) Å, V =4657 (2) Å3, Z =4. In 1, OBA dianions bridge Ni(II) atoms to form two crystallographically distinct chains. These chains are further extended into a 2D supramolecular architecure through p-p interactions. In 2, each OBA dianion links neighboring Pb(II) atoms to yield a helical chain. Further, π-π interactions among adjacent chains give rise to a 3D supramolecular architecture