Design, Synthesis And Property Studies Of Terpyridine-Phenothiazine Complexes

Optical functional complexes have a significant place in the field of functional materials, which have attracted considerable interest. The feature set of the functional organic-inorganic hybrid materials will show higher thermal stability and excellent optical activity compared with their separateness. The design of functional organic molecules further to build functional complexes can implement the organic-inorganic hybrid and optimize their performance, which are significant in the future development of materials science.Here, we designed and synthesized a series of phenothiazine derivatives, combined with a good rigid plane and strong coordination ability of heterocycle 2,2':6',2 "-terpyridine to functional organic molecules. And then we synthesized the complexes combined the ligands with inorganic nanoparticles. Main research results obtained are concluded as follow.1. Based on a great deal of related literatures, we surveyed the research progress of functional complexes, mainly focused on development of the 4'-substituted 2,2':6',2 "-terpyridine complexes and phenothiazine derivatives. New concepts and design of the novel ligands combined with 2,2':6',2 "-terpyridine with phenothiazine unit were proposed.2. Through the substitution, acylating and ring closing reaction, we successfully synthesized the two novel ligands:3-(4-(2,6-di(pyridin-2-yl)pyridin-4-yl) styryl)-10-hexyl-10H-phenothiazine(L1) and 10-hexyl-3-(2,6-di(pyridin-2-yl) pyridin-4-yl)-10H-phenothiazine(L2). All the synthetsized ligands, as well as the complexes, are characterized by IR,1HNMR, MS, elemental analysis and X-ray diffraction analysis methods.3. A novel series of sulfur-terminal complex are obtained by a facile solvothermal process through combining the ligands with ZnS and CdS nanoparticles. The unique feature of this new reaction design is that the inorganic nanoparticles ZnS, CdS were used as a precursor and bulky chromophoric ligands L1, L2 as an ancillary ligand, respectively. Significantly, the two sulfur atoms in the complexes are identically in minus oxidation state (S-1) and coordinated to M(â…¡) atom as terminal ligands, which has been rarely reported before. As a matter of fact, the versatility of the two terminal sulfur atoms was active related to biological system.4. A systemic investigation on the properties of the ligands and complexes were carried out, such as UV-Vis, SPEF, Photoluminescence and TGA. The results show that these compounds have displayed high optical activity, in particular for the two ligands. TGA has shown their good thermal stability. The compounds decompose at high temperature, while the complexes are more stable than their ligands. In addition, the biological imaging for the selected complex was studied.From the results obtained above, it can be conluuded that the target compounds have excellent optical properties and display high thermal stability. They may be potential candidates for optical functional materials.