서지주요정보
1.2-bispyrazylethylene 의 광화학적 cis = trans 이성질화 반응 = Photochemical cis?trans isomerization of 1.2-bispyrazylethylene
서명 / 저자 1.2-bispyrazylethylene 의 광화학적 cis = trans 이성질화 반응 = Photochemical cis?trans isomerization of 1.2-bispyrazylethylene / 이동수.
저자명 이동수 ; Lee, Dong-Soo
발행사항 [서울 : 한국과학기술원, 1976].
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소장정보

등록번호

4000222

소장위치/청구기호

학술문화관(문화관) 보존서고

MAC 7605

SMS전송

도서상태

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반납예정일

초록정보

A new compound, 1.2-bispyratyl ethylene was synthesized and characterized by spectroscopic methods and elemental analysis. In UV-VIS spectra, $(n.π^{*})^1$band which is expected to be separated from $(π,π^{*})^1$ band was bidden under strong($π.π^{*}$) absorption. From salt effects on fluorescence and photoreduction, it is believed that $(n.π)^1$ state has about the same energy as $(π.π^{*})^1$ state. The fluorescence yield from $(π.π^{*})^1$ state was 0.025 at 77˚K compared to near unity for stilbene at the same temperature and guantum yield for photoreduction is also very low, less than 0.1. From this results, it is concluded that singlet excited state of BPE has one or more very efficient relaxation processes other than fluorescence and photoreduction, very likely an efficient intersystem crossing because of ($n.π^{*}$) and ($π.π^{*}$) mixing. Direct and sensitized photochemical cis$\rightleftharpoons$trans isomerization of BFE was studied utilizing salt effect, solvent effect sensitization, quenching and photostionary state. It is concluded that twisted ($π.π^{*}$) triplet state is responsible for direct photoisomerization of BPE in contrast to direct stilbene isomerization which is believed to undergo through twisted ($π.π^{*}$) singlet state.

서지기타정보

서지기타정보
청구기호 {MAC 7605
형태사항 vi, 43 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Dong-Soo Lee
지도교수의 한글표기 : 심상철
지도교수의 영문표기 : Sang-Chul Shim
학위논문 학위논문(석사) - 한국과학기술원 : 화학과,
서지주기 참고문헌 : p. 41-43
주제 Isomerization.
Fluorescence spectroscopy.
광화학 반응. --과학기술용어시소러스
광 이성질화. --과학기술용어시소러스
형광 분석. --과학기술용어시소러스
Organic photochemistry.
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