期刊
SCIENTIFIC REPORTS
卷 8, 期 -, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41598-018-34790-0
关键词
-
资金
- JSPS KAKENHI [JP17H06375]
- Ministry of Education, Culture, Sports Science and Technology through Program for Leading Graduate Schools (Hokkaido University 'Ambitious Leader's Program')
- [18H02041]
- [18H04497]
- [17K1446707]
- [16J01325]
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.
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