Hydrothermal Synthesis, Crystal Structure, and Photoluminescence of Pb(II) and Mn(II) Coordination Polymers Based on Imidazo[4,5-f][1,10]phenanthroline1

摘要

Two new coordination polymers, [Pb(IDPT)2(NO3)2] (I) and [Mn(IDPT)(SO4)(H2O)2] (II) (IDPT = imidazo[4,5-f] [ 1, 10]phenanthroline), were synthesized by hydrothermal method and characterized by elemental analysis and single-crystal X-ray diffraction technique. The results reveal that the complex I belongs to monoclinic crystal system, space group C2/c and complex II belongs to monoclinic crystal system, P2_1/c space group. The cell parameters are: a = 19.1970(13), b = 7.3875(5), c = 17.3825(12) A, β = 100.47(10)°, V= 2424.0(3) A~3, Z= 4, F(000) = 1488 for I; a = 10.9135(6), b= 7.0230(4), c = 19.7034(10) A, P = 99.32(10)°, V= 1490.25(14) A~3, Z= 4, F(000) = 828 for II. In the structure of complex I, the metal center Pb(II) is six-coordinated, displays an octahedral geometry. Each molecule is further connected with neighboring one via n—% interactions into ID chain. In complex II, Mn(II) is six-coordinated to form a distorted octahedral geometry. Compound II displays ID supramolecular chain formed through hydrogen bonds. Additionally, the fluorescent properties for the complexes were investigated. Complexes I and II exhibit strong photoluminescence with emission maximum at 583 and 529 nm at room temperature.