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제118회 대한화학회 학술발표회, 총회 및 기기전시회 안내 An Emission Probe Specific for Cr3+ and Cu2+: Solvent-dependence

2016년 8월 31일 13시 02분 14초
INOR.P-250 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 13일 (목요일) 11:00~12:30
저자 및
김진흥*, 장하윤1, 박유미2, 이주현3, 전유정3
이화여자대학교 화학·나노과학과, Korea
1이화여자대학교 화학.나노과학과, Korea
2이화여자대학교 화학나노과학, Korea
3이화여자대학교 화학나노과학과, Korea
A new chemosensor containing julolidine-naphthylamine was prepared for sensing specific metal ions. Probe EW1 afforded a broad low fluorescence at 500-600 nm in acetonitrile, but gave a relatively stronger fluorescence at 540 nm in methanol. This chemosensor showed a selective turn-on emission for Cr3+ in CH3CN. Upon treatment with Cr3+, a strong emission was observed at 515 nm, but other metal ions, such as K+, Ag+, Ca2+, Zn2+, Co2+, Ni2+, Cu2+, Cd2+, Hg2+, Fe2+, Fe3+, failed to induce such an emission band. A clean isosbestic point appeared at 405 nm in the UV-vis titration with Cr3+. The emission intensity of the chemosensor was enhanced with incremental addition of Cr3+, indicating the formation of a 1:1 complex of the probe EW1 and chromium ion. However, this probe showed a selective turn-off response with Cu2+ in CH3OH. The emission band of the chemosensor at 540 nm was quenched only with Cu2+ and not with other control metal ions. The absorption band of the chemosensor at 410 nm progressively decreased, and a new absorption at 390 nm appeared upon progressive addition of Cu2+. All spectroscopic titration experiments and ESI mass data provided evidence for the formation of a 1:1 complex between the chemosensor and Cu2+.