Electronic spectra of 9,10-phenanthrenediamine: Effects of solvents and acid concentrations.

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概要

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• Dual fluorescence is observed from 9,10-phenanthrenediamine (PDA) in defferent solvents. Normal Stokes shifted fluorescence band is a structured one with vibrational frequency of ca. 750 cm<SUP>−1</SUP> and is polarized along the longer axis (<SUP>1</SUP>L<SUB>b</SUB> state). Large Stokes shifted fluorescence is a broad band and is polarized along the shorter axis of phenanthrene (<SUP>1</SUP>L<SUB>b</SUB> state). Fluorescence intensities of both the bands decrease with the increase of polarity and hydrogen-bond formation tendency of the solvents, but the preferential decrease in the fluorescence intensity of latter band system is more than that of the former band system under the above environments. Equilibrium for the prototropic reaction of monocation-free base is not established in the S<SUB>1</SUB> state within the lifetimes of the conjugate acid–base pair. Proton-induced fluorescence quenching constant for monocation is found to be 2×10<SUP>7</SUP> dm<SUP>3</SUP> mol<SUP>−1</SUP> s<SUP>−1</SUP> and this low value, as compared to that for neutral aromatic amines, is because of the presence of positive charge on the monocation.

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著者

• Dogra Sneh

  Department Of Chemistry I. I. T.

• Manoharan R.

  Department of Chemistry, Indian Institute of Technology

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