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

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.

Keywords

Singlet molecular oxygen NIR photoemission Raman spectroscopy

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