SYNTHESES AND PROPERTIES OF NOVEL CATIONIC CHLOROPHYLL DERIVATIVES

摘要

Development of molecular devices has attracted much attention in the field of electronics and photoelectronics. Not only metal nano particles but also biomolecules such as DNA, phospholipids. proteins and their supramolecules have been studied. It isof much Interest to conjugate chlorophylls (Chls), quite abundant photofunctional molecules In nature, with these biomolecules in water for fabrication of novel photofunctional materials such as artificial photosynthetic devices. Chi derivatives that carry cationic charges may be advantageous for interaction with anionic surfaces of the biomolecules and their supramolecules (Fabiano et al 1997. Ikeda et al 1997, Mansouri et al 1997. Miyatake et al 2002). The conjugation is, however, quite difficult because, in general, solubility of Chls in water is extremely poor. Chls rapidly form highly aggregated species in aqueous solutions, and it is quite hard to lower, and even control, the aggregation number. Water-soluble, cationic Chl derivatives should enable one to explore various possibilities that have not been examined yet.