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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Charge transfer control by steric effect on the non-conjugated xanthene backbone based donor-acceptor molecule

2019년 8월 29일 15시 23분 43초
MAT.P-383 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 17일 (목요일) 11:00~12:30
Material Chemistry
저자 및
Jeongwook Hwang, Kyung-Ryang Wee1,*
Department of Chemistry, Daegu University, Korea
1Department of Applied Chemistry, Daegu University, Korea
We have synthesized a series of non-conjugated xanthene backbone (2,7-di-tert-butyl-9,9-dimethyl-xanthene) based donor(D) and acceptor(A) molecules via a Buchwald-Hartwig, Suzuki-Miyaura cross-coupling reaction. We examined four different diphenylamine donors (F, H Me, OMe) with different electron donating characters to tuning the emission color by charge transfer (CT) control occurring between the donor and acceptor. Based on the solvent dependent emission changes and non-conjugated molecular structure, we have confirmed the emission origin is from the through-space charge transfer (TSCT). The non-conjugated D and A molecules avoid the direct charge transfer and induce of through-space charge transfer, which was identified in the steady state absorption and emission spectra. The Lippert-Mataga plot indicated that these compounds are more affected by steric hindrance than the effect of substituents. From a structural point of view, the donor and acceptor on the xanthene backbone are positioned with co-facial alignment at distances of about 7.5-8.5 Å wherein efficient spatial charge transfer can occur. To understand the structure-properties relationships, DFT and TD-DFT calculations were performed and compare the experimental properties. The results show that the TSCT control based on xanthene molecules have a little effect on color tunable properties.