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Electronic chirality inversion of lanthanide complex induced by achiral molecules

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Title: Electronic chirality inversion of lanthanide complex induced by achiral molecules
Authors: Wada, Satoshi Browse this author
Kitagawa, Yuichi Browse this author
Nakanishi, Takayuki Browse this author
Gon, Masayuki Browse this author
Tanaka, Kazuo Browse this author
Fushimi, Koji Browse this author
Chujo, Yoshiki Browse this author
Hasegawa, Yasuchika Browse this author →KAKEN DB
Issue Date: 6-Nov-2018
Publisher: Nature Publishing Group
Journal Title: Scientific reports
Volume: 8
Start Page: 16395
Publisher DOI: 10.1038/s41598-018-34790-0
Abstract: 3A novel mechanism for chiroptical activity inversion based on the electronic structure of metal complexes without Lambda- or Delta-type structure change was demonstrated spectroscopically and theoretically. To demonstrate the mechanism, a europium (Eu(III)) complex with chiral (+)-3-(trifluoroacetyl) camphor (+tfc) and achiral triphenylphosphine oxide (tppo) was prepared. The steric and electronic structures of the Eu(III) complex were adjusted by additional achiral tppo and coordinating acetone molecules, and were characterised by H-1 NMR, photoluminescence, and emission lifetime measurements. The optical activity of the Eu(III) complex in solution was evaluated by circularly polarized luminescence (CPL) measurements. CPL sign inversion, which was independent of Lambda- or Delta-type structure changes from the spectroscopic viewpoint, and a drastic CPL intensity enhancement were observed depending on the external achiral molecules around Eu(III) ion. These phenomena provide the first clarification of optical activity change associated with electronic structure rather than chiral coordination structure-type (Lambda or Delta) under external environments.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 長谷川 靖哉

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