天然胺基酸支鏈對電子移轉速率的影響

• Main Author: 蔡東洲
• Other Authors: 張一知
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/94757560092802273873

碩士 === 國立臺灣師範大學 === 化學學系 === 85 === 　　Electron donor-acceptor complexes that are bridged by single amino acid have been prepared.Ru(bpy)2phenNH22+ has been used as electron donor and dinitrophenyl as electron acceptor. Ruthenium complexes with methyl substitution on bipyridine have been made to evaluate the driving force dependency of the electron transfer rate. 　　Excitation into the MLCT band of the ruthenium complex induces electron transfer from phenanthroline radical to dinitrophenyl moiety through the amino acid bridge.The rates for glycine-, phenylalanine-, and isoluecine-bridged complexes are 2.1×107, 3.1×107 and 3.6×107s-1 respectively, The trends in the rates are consistent with the electron donating ability of the side chain for each amino acid. These results indicate that hole tunneling through □-bonds is a good model for electron transfer in metalloproteins. 　　Electron transfer rates in Ru(dmbpy)2phenNH-and Ru(tmbpy)2phenNH-complexes are much too fast to measure at current time.The lower limit of the rate is 5 ×107s-1.