Linked Donor/Acceptor/Photosensitizer Systems

点击翻译按钮获取中文摘要

This project is in the general field of analytical and surface chemistry and in the subfields of photochemistry and electrochemistry. Chemical synthetic methods will be employed to prepare a wide variety of linked intramolecular electron transfer systems that have unique properties absent in non-linked systems. The complexes are based on trisbipyridine (II) as a light-harvesting photocenter. This photocenter is covalently linked via flexible linkages to N,N'-diquaternary- 2,2'-bipyridinium as an electron acceptor and/or N-alkyl phenothiazine as an electron donor. In other series, triply bridged heterodinuclear ruthenium/rhodium complexes with relatively rigid linkages will be studied. Ground state properties will be characterized by electrochemical, spectroelectrochemical and spectroscopic methods. Electron transfer rates will be determined by time-resolved emission and absorption spectroscopy. Combined electrochemical, photochemical and photophysical studies of linked donor/acceptor photosensitizer systems will lead to a better understanding on the molecular level of light-induced electron transfer systems. The results will aid in the design of more efficient molecular systems for converting light emergy into useful chemical energy.