HYDROPHOBIC EFFECT ON PHOTOCHEMICAL AND PHOTOPHYSICAL PROCESSES X. AGGREGATION AND EXCIMER FORMATION OF 2,2’-BINAPHTYL, A NONPOLAR MOLECULE,IN AGGREGATING SOLVENT

doi:10.7517/j.issn.1674-0475.1990.01.72

Abstract

Abstract: The absorption and fluorescence spectra of 2,2’-naphthyl in various solvents were investigated.In dimethyl sulfoxide-water (DMSO-H₂O) and ethylene glycol-water (EG-H₂O) solvent mixtures (aggregating solvents) the dimer formation of 2,2’-binaphthyl was observed,while in organic solvents no excimer or dimer was detected even at high concentration.Dimer formation in aggregating solvents is attributed to the aggregation of 2,2’-binaphthyl,driven by hydrophobic interaction.Excitation energy migration inside aggregates also plays an important role in the dimer formation.The addition of cyclodextrin to the solution of 2,2’-naphthyl in aggregating solvents results in formation of inclusion complex and destruction of aggregates.

Key words: aggregation, dimer, excitation energy migration, cyclodextrin

XU CHENG-BAI, TUNG CHEN-HO. HYDROPHOBIC EFFECT ON PHOTOCHEMICAL AND PHOTOPHYSICAL PROCESSES X. AGGREGATION AND EXCIMER FORMATION OF 2,2’-BINAPHTYL, A NONPOLAR MOLECULE,IN AGGREGATING SOLVENT[J]. Imaging Science and Photochemistry, 1990, 8(1): 72-76.

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HYDROPHOBIC EFFECT ON PHOTOCHEMICAL AND PHOTOPHYSICAL PROCESSES X. AGGREGATION AND EXCIMER FORMATION OF 2,2’-BINAPHTYL, A NONPOLAR MOLECULE,IN AGGREGATING SOLVENT

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