Discotic liquid crystals of transition metal complexes. 23:Synthesis and mesomorphism of tetrakis(3,4-di-n-alkylphenyl)porphyrin derivatives and their metal complexes

✍ Scribed by Kazuchika Ohta; Masahiro Ando; Iwao Yamamoto

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 250 KB
• Volume: 03
• Category: Article
• ISSN: 1088-4246
• DOI: 10.1002/(sici)1099-1409(199904)3:4<249::aid-jpp129>3.0.co;2-i

✦ Synopsis

Five novel long-chain-substituted porphyrin derivatives, tetrakis(3,4-dialkylphenyl)porphyrins (abbreviated as (C n ) 8 TPPH 2 (n = 8, 12, 18), (C 18 ) 8 TPPCu and (C 18 ) 8 TPPNi), were synthesized and their mesomorphism was investigated. It was found that the (C n ) 8 TPPH 2 (n = 8, 12), derivatives are isotropic liquids at room temperature and that each of the (C 18 ) 8 TPPM (MH 2 , Cu, Ni) derivatives has two liquid crystal phases M 1 and M 2 and two unidentified phases X 1 and X 2 . It was revealed by X-ray studies that the M 2 phase is a discotic lamellar (D L ) phase. Interestingly, these porphyrin derivatives exhibit not a columnar but a lamellar mesophase, even though they have a disk-like central core with eight alkyl chains in the surroundings.