Studies On The Synthesis, Structural Identification And Liquid Crystalline Properties Of Metallic Complexes Of Meso-Tetra (3-alkoxyphenyl) Porphyrin

Porphyrins molecules posses not only good stability but also certain rigidity and polarizability due to its special conjugated macrocyclic core. Appended peripherily with several proper aliphatic tails,they can be orderly stacked and exhibit discotic liquid crystalline behavior. Especially after their metallic complexes are prepared , liquid crystalline properties of porphynns are improved. So porphynns and their complexes have potentially important practical applications.40 meso-tetra(3-alkoxyphenyl)porphyrins metallic complexes with different alkoxy chain length and different metal were synthesized with Alder-Longo method, all of them were new compounds. By means of purifying and crystallizing meso-tetra(3-alkoxyphenyl)porphyrins and their complexes,for ligands,we found that the solid state of these compounds could be achieved by crystallization from petro-ether/methanol solution and cooling in an ice-salt bath for long time. Double refraction could be observed, while these solid state compounds were put under polarizing microscope. So,the conclusion that these solid state compounds were all crystals was drawn.The structure of these compounds were identified through UV, IR, MS and 1HNMR. The correlation between the structure of compounds and UV, IR, MS and 1HNMR spectra was studied and their specific spectra were explained, and the criteria of porphyrins complexes was summarized. Through mass spectrometry and 1HNMR spectra ,the exist of bridge oxygen chain sandwich dimer in ferriporphyrins was identified.The liquid-crystal properties of synthesized thirty metal derivatives were studied through DSC and POM. We found twelve metallo-porphyrins have liquid-crystal characteristics.They show the heating monotropic liquid crystal.By POM, liquid crystalline state was observed and filamentary optical texture was displayed. With increasing alkoxy chain length liquid crystalline characteristics was displayed.