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1 July 2004 The Fluorescence Properties of Hypocrellin B and its Amino-substituted Derivative: Photoinduced Intramolecular Proton Transfer and Photoinduced Intramolecular Electron Transfer
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Abstract

We report on the emission spectra and emission quantum yields of a newly synthesized hypocrellin dye, 2-demethoxy-2,3-ethylenediamino hypocrellin B (EDAHB), and its parent HB in different solvents of varying polarity. Our results demonstrate that EDAHB is one of the few dyes that exhibit highly solvent polarity–dependent fluorescence in the useful region (680–730 nm). Therefore, it offers some applications in the biomedical field as a fluorescent probe molecule. The solvatochromic effect of EDAHB is proposed to be due to a distinct change in the dipole moment of the dye on excitation. A photoinduced intramolecular proton transfer and a photoinduced intramolecular electron transfer process are considered relevant for the fluorescence properties of HB and EDAHB, respectively.

Shangjie Xu, Xiaoxing Zhang, Shen Chen, Manhua Zhang, and Tao Shen "The Fluorescence Properties of Hypocrellin B and its Amino-substituted Derivative: Photoinduced Intramolecular Proton Transfer and Photoinduced Intramolecular Electron Transfer," Photochemistry and Photobiology 80(1), 112-114, (1 July 2004). https://doi.org/10.1562/2004-03-13-RN-113.1
Received: 12 March 2004; Accepted: 1 April 2004; Published: 1 July 2004
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