The Synthesis Of Semi-Rigid Ligands With Spacers Of Triphenyl Triazine And Phthalic Imide And Their Propertie S Of Transition Metal Complexes

In this thesis, two series of organic ligands containing 2 – isopropyl-benzimidazolyl or bipyridyl groups were synthesized, including:(1) tripodal ligands containing1,3,5-trisphenyl benzene spacers and 2 – isopropyl-benzimidazolyl terminal groups(L1),(2) tripodal ligands containing 2,4,6-trisphenyl-1,3,5-triazine and 2 – isopropyl-benzimidazolyl terminal groups(L2),(3) tripodal ligands containi2,4,6-trisphenyl-1,3,5-triazine and 5,6-dimethybenzimidazolyl terminal groups(L3),(4) bipodal ligands containing oxydiphthalic diimide spacers and bipyridymethyl erminal groups(L4). Under guidance of supermolecular self-assembly strategy, all these four ligands were coordinated with transition metals to construst discrete or multi-dimmisional infinite complexes. All together,6 complexes were assembled some of them were from the same metallic ions but different ligands, while others were from the same kinds of liangds but different metallic ions with varied geometrical coordination modes. Their structures were determined by single-crystal X-ray diffraction analysis and further characterized by powder X-ray diffraction, elemental analysis, infrared spectra, and circular dichroism analysis. The results were as follows:(1) Adjusting the flexibility of the spacer groups in the ligands would result in trigonal prims with different flexibiy.The prims formed by L1 1,3,5-trisphenyl benzene as spacers groups or L2 with 2,4,6-trisphenyl-1,3,5-triazine as spacers groups have different flexibility properties. The latter is more rigid since it has to rigid planes packing closely together, while the former is more flexible. This will bring some hints to study on contractive outstretched molecular cages.(2) Adjusting the positions of the modification groups in benzimidazole rings, ligands L2 with 2 – isopropyl-benzimidazolyl groups and L3 with 5,6-dimethybenzimidazolyl terminal groups would form trigonal prisms with different volumes when coordination with transition metals Hg or Zn. In complexes 3 the top and lower ligand planes are closely packed by π···π interactions and the prismatic strucyures have no rooms to hold guest moleculars. In complexes 4 the prims have no close π···π between the top and lower ligands planes,therefore, the prims have lager inner volumes to contain plentiful gust molecules.(3) Semi-rigid ligands L4 have been synthesized. L4 coordination with cobalt salts would rusult in two dimensional(4,4)topological net. Complexes 5 was meso enantiomerrs,but Complexes 6 was chiral enantiomerrs..This result show that by modifying the counter ion,it syccessfully achieved the regulations of structers from meso enantiomerrs to chiral enantiomerrs.