Collect. Czech. Chem. Commun. 2004, 69, 748-758

Spectral and Photoprototropic Characteristics of 4-Aminobiphenyl in β-Cyclodextrin

Israel V. Muthu Vijayan Enoch and Meenakshisundaram Swaminathan*

Department of Chemistry, Annamalai University, Annamalainagar 608 002, India


The photophysical and photoprototropic behaviour of 4-aminobiphenyl (4ABP) in aqueous β-cyclodextrin (β-CDx) solution has been investigated using steady-state and time-resolved fluorescence spectroscopy. Fluorescence of the neutral form of 4ABP is enhanced due to the formation of a 1:1 complex with β-CDx. The formation of this complex has been confirmed by time-resolved spectroscopy. In the presence of β-CDx, no change was observed in the ground state pKa value but the excited state pKa value changed. Based on its photophysical and photoprototropic characteristics in β-CDx, the structure of the 1:1 inclusion complex is proposed.

Keywords: Inclusion complexes; Biaryls; Cyclodextrins; Photoprototropism; Excited-state acidity constant; Fluorescence spectroscopy.

References: 56 live references.