Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (7): 1125.doi: 10.7503/cjcu20160958

• Articles: Inorganic Chemistry • Previous Articles     Next Articles

Synthesis, Structure and Luminescence Property of Transition Metal Complexes with 1,3-Di(4-pyridyl)-propane and 1,2-Benzenedicarboxylic Acid

WANG Qiushuang, ZHENG Xiaoli, QU Xianglong, LI Rui, LI Xia*()   

  1. Department of Chemistry, Capital Normal University, Beijing 100048, China
  • Received:2016-12-29 Online:2017-07-10 Published:2017-05-02
  • Contact: LI Xia E-mail:xiali@cnu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No;21471104) and the Cross Scientific Research Projects, Capital Normal University, China

Abstract:

Taking 1,3-di(4-pyridyl)-propane(bpp) and 1,2-benzenedicarboxylic acid(1,2-H2bdc) as ligands, three new transition metal complexes, M2(1,2-bdc)2(bpp)2·2H2O[M(Ⅱ)=Co(1), Ni(2)] and Cd(1,2-bdc)(bpp)·H2O(3), were obtained. Complexes 1 and 2 crystallize in monoclinic crystal system with space group P21 and show 3D structures with {65·8} topology. There are two M(Ⅱ) centers with the similar coordination environments in complexes 1 and 2. Each M(Ⅱ) center is six-coordinated to three oxygen atoms from two 1,2-bdc ligands, two nitrogen atoms from bpp ligands and one water molecule in a distorted octahedral arrangement. The 1,2-bdc ligand adopts monodentate bridging/bidentate chelating mode to link two metal centers to form M1-(bpp)-M1 right-handed-helical chain. The bpp ligand adopts Trans-Gauche(TG) conformation and connects adjacent M(Ⅱ) centers to form M1-(bpp)-M1 and M2-(bpp)-M2 chains. These three kinds of chains are woven together to form a 3D framework. Complex 3 crystallizes in monoclinic crystal system with space group P21/c and shows a 2D structure. The Cd(Ⅱ) is in distorted pentagonal bipyramidal polyhedron with four oxygen atoms of two 1,2-bdc ligands, two nitrogen atoms of bpp ligand and one water molecule. The 1,2-bdc ligand adopts bi(bidentate chelating) mode to link Cd(Ⅱ) centers to form Cd-(1,2-bdc)-Cd chain. The bpp ligand adopts TG conformation and connects Cd(Ⅱ) centers to form Cd-(bpp)-Cd chain. The two kinds of chains with shared Cd(Ⅱ) are alternately arranged to form a 2D structure. Complex 3 shows strong ligand-based fluorescence with maximum emission at 408 nm, which is attributed to π* transition of the ligands. Different organic small molecules have different effects on the fluorescence intensity of complex 3, and aniline has a significant quenching effect, thus complex 3 can be used for the selective detection of aniline through fluorescence quenching mechanism.

Key words: Transition metal complex, 1, 3-Di(4-pyridyl)-propane, 1, 2-Benzenedicarboxylic acid, Crystal structure, Fluorescence

TrendMD: