Abstract

To explore the mechanism of intermolecular hydrogen bond relating to PRODAN derivative 2b in methanol solvent on photoexcitation process, spectral behavior calculations of PRODAN-2b and its hydrogen bonding complex were studied by using density functional theory (DFT) and time-dependent density functional theory (TDDFT). After photo excitation, the hydrogen bond between PRODAN-2b and methanol become stronger. It was found that with the increase in the number of methanol molecules, the more hydrogen bonds between PRODAN-2b and methanol were formed and the hydrogen bondings were also enhanced. Further evidence for enhanced hydrogen bond due to intramolecular charge transfer excitation character of PRODAN-2b is presented. This effect leads to the red shift of absorption and fluorescence spectra of PRODAN-2b molecules in methanol solvent with increasing methanol concentration.

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