Abstract
Abstract Phosphorescence spectra of m-fluorobenzaldehyde and its aldehyde deuterated derivative have been observed in the vapor phase at room temperature and in a methylcyclohexane matrix at 4.2 K. Paired band systems were detected for the vapor phase and for each of the two different crystallographic phases, α- and β-phases, and were attributed to two rotational isomers of the aldehyde group. Variable intensity changes between the two paired bands observed in the α-phase crystal are manifestations of the isomeric conversion in the ground state during crystallizations. An energy correlation of the rotational isomers between the lowest excited nπ* singlet and triplet states is given for the vapor phase and for the α-phase methylcyclohexane matrix.
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