Benzo Imidazole Metal Complexes Orderly Super-molecule Synthesis And Structural Study

The studies on transitional metal complexes are much interested whether as mimics of the biological system or as new materials with novel electrical, magnetic and optical properties. In terms of crystal structure, we analyzed the coordination modes of carboxyl groups and aggregate mode with credible experiment data.In this thesis, we choose the anion ligands (Diglycolic acid and Thiodiglycolic acid) and the neutral benzimidazole ligands (BZIM), which form aromatic stacking possibly, to synthesize a series of transition metal complexes (not reported), and four single crystals were determined by single crystal X-ray diffraction (Table 1).The following are the valuable results from our structure research of the series new complexes:1. In one crystal structure of the thesis, we found that the parallel benzimidazoles overlap and stack in close quarters, with the distance between benzimidazole less than the aromatic Van der Waals thickness. It shows the existence of aromatic π-π-stacking interaction. There are aromatic π-π-stacking interactions in the series complexes, which provide the strong evidence for aromatic π-π-stacking interactions being primary supramolecular action in the forming of orderly congeries.2. Extensive hydrogen bonds are in all the supramolecular systems. Besides traditional formation of O—H…O, O-H… N, the type of feeble hydrogen bonds (C-H… O) exists at large comparably in the complexes. Hydrogen bonds play big roles in the formation of orderly congeries.3. In the other three structures of this thesis, there is no aromatic n-7i-stacking interaction. So we found that the forming of aromatic π-π-stacking interaction has important relation with the intermolecular hydrogen bonds and polymeric mode of complex.