The Design And Photochromic Properties Of Hybrid Phosphate Materials

Hybrid photochromic materials with unique photosensitive properties and reversible color change behaviors can be coupled with physical properties such as light,electricity,and magnetism to generate new functions,which have attracted much attention in the new intelligent materials.From two systems of hybrid materials constructed with hydrogen bonds and coordination bonds,the thesis elaborated the structure,performance and internal mechanism of the novel hybrid photochromic materials constructed by the ligand?phosphoric,phosphorous?and polypyridine unit and transition metals.The specific work is as follows:Firstly,by self-assembly of polypyridyl ligands with phosphoric acid groups,three photochromic hybrid adducts[?H₂PO₄?₂?H₂-bipy?]·2H₂O?bipy=4,4?-bipyridine??1?,[?H₂PO₄?₂?H₂-bpyb?]·2H₂O?bpyb=1,4-bis?4-pyridinyl?benzene??2?and[?H₂PO₄?₂?H₂-bpbp?]·4H₂O?bpbp=1,4-bis?4-pyridinyl?biphenyl??3?were synthesized by hydrothermal method.The hydrogen bonding interactions are formed between ligands and used as an electron transfer path.Through the discoloration experiment,this series of structures exhibit a fast light response and relaxation phenomenon,showing an efficient"switching"behavior.Secondly,four hybrid photochromic complexes[NH₂?CH₃?₂][Zn₃?HPO₄?₂?PO₄??bpyb?₂]·H₂O?4?,[Zn?HPO₄??bpyb?_0.5]·3H₂O?5?,[Zn?HPO₃??bipy?_0.5]?6?and[Zn?HPO₃??bpyb?_0.5]?7?are obtained via introducing the transition metal zinc ions into the adducts.Polypyridyl ligand and phosphorus groups are bridged by coordination bonds with zinc metal ions.The effect of metal ions,different coordination modes and the conjugation strength of polypyridine units on the photochromic behavior of this series of complexes are researched.