Abstract
The absorption, emission and excitation spectra of 4-methyl-2,6-diformyl phenol (MFOH) in pure acetone and acetonitrile and in the presence of triethylamine (TEA) were recorded at room temperature (298 K) and 77 K. The broad emission band at 460 nm is assigned to the hydrogen-bonded open conformer. It is proposed that interaction of MFOH with TEA results in the formation of a hydrogen-bonded ion pair and solvent-separated ion pair in the ground state and 4-methyl-2,6-diformyl anion (MFO− and ion pair in the excited state. From the nanosecond measurements and quantum yields of fluorescence, we estimated the decay rate constants. At 77 K, deactivation occurs via phosphorescence although fluorescing species also exist. Both fluorescence and phosphorescence are found to be excitation wavelenght dependent.
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