Extremely high stereoselectivity of novel helical ruthenium(II) complexes for photoinduced reduction of racemic-[Co(acac)(3)] (Hacac=pentane-2,4-dione)

被引：12

作者：

Ohkubo, K

Fukushima, M

Ohta, H

Usui, S

机构：

[1] Dept. of Appl. Chem. and Biochem., Faculty of Engineering, Kumamoto University

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 1996年 / 98卷 / 03期

关键词：

asymmetric photocatalysis; helical ruthenium(II) complex; stereoselective photoreduction; photoinduced kinetic resolution;

D O I：

10.1016/1010-6030(95)04286-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A photocatalyst M(C-3)-Delta-[Ru(menbpy)(3)](2+) (menbpy = 4,4'-bis{(1R,2S,5R)-(-)-methoxycarbonyl}-2,2'-bipyridine; M(C-3) = minus (counterclockwise) helical arrangement along the C-3 symmetry axis) possessing a lang lifetime tau and the low quantum yield of photoracemization Phi(rac) (tau = 1500 ns and Phi(rac) = 4.0 x 10(-6) in EtOH at 298 K) facilitated the asymmetric reduction of racemic Delta,Lambda-[Co(acac)(3)] (Hacac = pentane-2,4-dione) at 298 K in deaerated 90% v/v EtOH-H2O; it exhibited extremely high stereoselectivity with the enantiomer rate ratio k(Delta)/k(Lambda) = 14.79 (in the absence of Hacac) -91.9 (in the presence of Hacac).

引用

页码：137 / 140

页数：4

共 7 条

[1] ESTIMATION OF EXCITED-STATE REDOX POTENTIALS BY ELECTRON-TRANSFER QUENCHING - APPLICATION OF ELECTRON-TRANSFER THEORY TO EXCITED-STATE REDOX PROCESSES [J].