Photophysical behaviors of novel indodicarbocyanines and indotricarbocyanine in Nafion-Na + membrane

• Published in: Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 1998-03, Vol.114 (1), p.45-49
• Main Authors: Guan, Jing-Qu, Dai, Zhi-Fei, Tung, Chen-Ho, Peng, Bi-Xian
• Format: Article
• Language: English
• Subjects: Atomic and molecular physics; Energy transfer; Exact sciences and technology; Fluorescence and phosphorescence spectra; Fluorescence and phosphorescence; radiationless transitions, quenching (intersystem crossing, internal conversion); Heterogeneous distribution; Indodicarbocyanine; Indotricurbocyanine; Molecular properties and interactions with photons; Nafion; Photophysical property; Physics
• ISSN: 1010-6030; 1873-2666
• DOI: 10.1016/S1010-6030(98)00203-2

Four novel indodicarbocyanines and one indotricarbocyanine have been incorporated into Nafion and the photophysical properties have been investigated which suggests that these dyes are located at the fluorocarbon/ water interface. The absorption spectra of all the tested dyes in Nafion are similar to those in water despite bathochromic shift. Significant fluorescence enhancement for these dyes in Nafion with regards to water has been observed and the fluorescence quantum yields have been measured. Singlet-singlet energy transfer has been confirmed by steady state fluorescence technique and the energy transfer parameters have been determined. The energy transfer efficiencies of each donoracceptor (D-A) pair in Nafion lie in the range of 72–90%, while in water solution under the same experimental concentration range (10 5 VI) no energy transfer occurred for any investigated D-A pair. The occurrence of energy transfer reveals that these donor and acceptor molecules are hetcrogeneously distributed in Nafion, and the incorporation of donor and acceptor molecules into the same cluster in Nafion may be possible.