Evaluation of absolute configuration of naphthylphenyl-substituted oligosilanes by CD exciton chirality method.
Absolute configurations of methylnaphthylphenyl-substituted oligosilanes, MeNpPhSi*SiMeR(1)R(2) [2 (R(1), R(2)=Me), 3 (R(1)=Me, R(2)=Ph), 4 (R(1), R(2)=Ph), and 5 (R(1)=Me, R(2)=SiMe(3))] were predicted by circular dichroism (CD) exciton chirality method. The sigma-pi conjugation effect of oligosilylene units (sigma-linkage) with pi-electron systems caused an intense red-shift of (1)L(a,Ph) transition band of the oligosilanes as shown in UV/VIS and made it possible to observe clear CD exciton chirality between the two aromatic chromophores on chiral silicon atom.
Oh
Hyun-Shik
HS
Graduate School of Materials Science, Japan Advanced Institute of Science and Technology [JAIST], Ishikawa, Japan.
Imae
Ichiro
I
Kawakami
Yusuke
Y