Using Raman spectroscopy without any preparation, we analyzed the brominated flame retardant, polybromodiphenyl ethers (PBDEs), which has been prohibited by the European Union. The typical Raman bands of PBDEs, which are clearly different from those of other brominated flame retardants, are from 100 to 300 cm(-1). In our analysis, the detection limit was about 100 ppm, and the analysis took about 1 min, whereas the usual method of solvent extraction using gas chromatography/mass spectroscopy takes 50 h.
The electronic absorption spectrum caused by the charge transfer interaction between oxygen and triethylamine was studied quantitatively. It is concluded that there is no particular stabilization between them due to the charge transfer interactions. The intermediate radicals produced by the excitation of triethylamine–O2 in the region of the charge transfer band were studied by the ESR method at various temperatures from 77 to 300 K. The chemical analysis of the irradiation products of the same system was also carried out. The radicals observed are methyl, ethyl, and possibly, (C2H5)2N\dotCHCH3, \dotOOH and (C2H5)2NO·. The products identified are acetaldehyde and diethylamine. Based on these results, the various reactions taking place in the overall photochemical process were speculated.
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