Abstract
The fluorescence spectra of solutions of naphthalene and fourteen of its methyl, ethyl, dimethyl and trimethyl derivatives were observed as a function of molar concentration
c
at 20 °C and as a function of temperature from 20 to -70 °C. All the compounds show similar excimer fluorescence characteristics with mean values of the excimer binding energy
B
= 0.28 ± 0.03 eV and of the excimer interaction energy
V'
m
= 0.765 ± 0.03 eV, with the exception of 1,8-dimethyl naphthalene (B = 0.14 eV) in which excimer formation is sterically hindered. The monomer fluorescence quantum efficiencies and ionization potentials were also determined. The fluorescence spectra of liquid 1,6-dimethyl naphthalene and its solutions in three solvents were observed, and the rate parameters and the entropy change ∆
S
on excimer formation were determined,
B
and ∆
S
(= -19.1 cal mole
-1
deg
-1
) have similar values in the pure liquid and in
cis
-decalin and dilute (
c
≤ 1 m) cyclohexane solutions, but slight differences occur in
n
-heptane and concentrated (c > 1 m ) cyclohexane solutions.
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