메뉴 건너뛰기
.. 내서재 .. 알림
소속 기관/학교 인증
인증하면 논문, 학술자료 등을  무료로 열람할 수 있어요.
한국대학교, 누리자동차, 시립도서관 등 나의 기관을 확인해보세요
(국내 대학 90% 이상 구독 중)
로그인 회원가입 고객센터 ENG
주제분류

추천
검색

논문 기본 정보

자료유형
학술저널
저자정보
James, P.V. (Photosciences and Photonics Group, National Institute for Interdisciplinary Science and Technology [CSIR] [formerly Regional Research Laboratory]) Yoosaf, K. (Photosciences and Photonics Group, National Institute for Interdisciplinary Science and Technology [CSIR] [formerly Regional Research Laboratory]) Kumar, Jatish (Photosciences and Photonics Group, National Institute for Interdisciplinary Science and Technology [CSIR] [formerly Regional Research Laboratory]) Thomas, K.George (Photosciences and Photonics Group, National Institute for Interdisciplinary Science and Technology [CSIR] [formerly Regional Research Laboratory]) Listorti, Andrea (Molecular Photoscience Group, Istituto per la Sintesi Organica e la Fotoreattivita, Consiglio Nazionale delle Ricerche) Accorsib, Gianluca (Molecular Photoscience Group, Istituto per la Sintesi Organica e la Fotoreattivita, Consiglio Nazionale delle Ricerche) Armaroli, Nicola (Molecular Photoscience Group, Istituto per la Sintesi Organica e la Fotoreattivita, Consiglio Nazionale delle Ricerche)
저널정보
한국광과학회 Photochemical & photobiological sciences : an international journal Photochemical & photobiological sciences : an international journal 제8권 제10호
발행연도
2009.1
수록면
1,432 - 1,440 (9page)

이용수

표지
📌
연구주제
📖
연구배경
🔬
연구방법
🏆
연구결과
AI에게 요청하기
추천
검색

초록· 키워드

오류제보하기
A bipyridine-based system with phenyleneethynylene at the 4,4' positions (1) and its p-methyl (2) and p-methoxy (3) substituted derivatives were synthesized via Sonogashira coupling reactions. The photophysical properties of 1-3 and their related $H^+$ and $Zn^{2+}$ adducts (1:$H^+$-3:$H^+$ and 1:$Zn^{2+}$-3:$Zn^{2+}$) were investigated, as a function of solvent polarity, by using steady-state and time-resolved spectroscopic techniques. Molecular systems 1-3 exhibit trans conformation, whereas adducts with $H^+$ and $Zn^{2+}$ are conformationally locked cis species. The unsubstituted compound 1 emits at 360 nm with low fluorescence quantum yield (${\Phi}_{fl}$ = 0.2%) regardless of the solvent polarity. Fluorescence spectra of 2 and 3 are bathochromically shifted in polar solvents, and the p-methoxy (3) derivative possesses ${\Phi}_{fl}$ as high as 12%. Complexation of 1-3 with $H^+$ or $Zn^{2+}$ in acetonitrile causes red-shift of the lowest energy absorption bands, whereas dramatic changes of the emission properties are found as a function of the electron donating ability of the substituents on the phenyleneethynylene moiety ($-CH_3$ or $-OCH_3$), suggesting a charge-transfer character of the lowest electronic transition of 1-3. 1:$H^+$, 1:$Zn^{2+}$, 2:$H^+$ and 2:$Zn^{2+}$ exhibit intense fluorescence with ${\Phi}_{fl}$ up to 33% (1:$Zn^{2+}$) whilst 3:$H^+$ and 3:$Zn^{2+}$ are found to be weakly emissive. The singlet radiative and non-radiative rate constants of compounds and complexes were determined, along with triplet parameters, via phosphorescence and transient absorption spectroscopy. More conclusive evidence regarding the protonation of bipyridine nitrogen atoms of compounds 1-3 were obtained through $^1H$ NMR titration studies. These studies indicate that the conjugate molecular systems based on 2,2'-bipyridine and phenyleneethenylenes possess tunable optical properties which can be further utilized for preparing organic and inorganic luminophores with potential application in optoelectronic systems.

목차

등록된 정보가 없습니다.

참고문헌 (0)

참고문헌 신청

함께 읽어보면 좋을 논문

논문 유사도에 따라 DBpia 가 추천하는 논문입니다. 함께 보면 좋을 연관 논문을 확인해보세요!

이 논문의 저자 정보

최근 본 자료

전체보기

댓글(0)

0