Dioxygen NIR FT-Emission (1Δg → 3Σ−g) and Raman Spectra of 1,4-Dimethylnaphthalene Endoperoxide: A Source of Singlet Molecular Oxygen

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Abstract
Singlet molecular oxygen (1O2) monomol light emission (O2, 1Δ g → 3Σ− g) generated during the thermodissociation of 1,4-dimethylnaphthalene endoperoxide (1,4-DMNO2) has been directly detected with the use of an FT spectrophotometer equipped with a liquid nitrogen-cooled InGaAs detector. The 1O2 quenching by β-carotene has been observed. The bimol emission has also been detected by the use of an intensified diode array detector and characterized by enhancement with 1,4-diazabicyclo[2.2.2]octane (DABCO). With a multichannel detector it was possible to obtain the Raman spectrum of 1,4-DMNO2 and to follow its conversion into the parent hydrocarbon 1,4-dimethylnaphthalene (1,4-DMN) by the decrease of the Raman 715-cm−1 peak intensity attributed to the O-O stretching mode.