Possibilities of the identification and investigation of the structure of N-nitrosamines from the raman spectra

Resonance Raman spectrum of a deuterated crystal violet: [p(CH3)2N•C6D4]3C+Cl−

“…The spectrum of normal CV shown in Fig. 1 contains many well resolved doublets which were not clearly resolved in some of the earlier reports (9,12). The notable examples of this are the doublets at about (a) 1174cm-I and 1192cm-I, (b) 426cm-I and 444cm-I, and (c) 971 cm-' and 990 cm-' .…”

“…Before discussing the assignment of the deuterated crystal violet we would like to make a few brief comments on the literature assignments for normal CV. Three different groups of workers have suggested the assignments for the spectrum of CV (9,12,13). The strong Raman band seen around 1372 cm-I has been assigned to the +C-C stretching vibration in ref.…”

“…We are grateful to Dr. L. Leach for synthesizing as given in the three published papers (9,12,13). and s~P P~Y~~~ the CV-diz used in this ~i c~u e l et a1.…”

“…Resonance am& spectroscopy, due to its ability to give detailed molecular information at very low concentration of the sample, is being increasingly used to investigate systems with chromophoric moieties. Spectra of CV have been reported previously (8)(9)(10)(11)(12)(13)(14). All of these communications deal with the normal crystal violet and there is no published report on the resonance Raman spectrum of any of its deuterated derivatives according to the information available to us.…”

Spontaneous disproportionation of lithium biphenyl in solution: a combined experimental and theoretical study

“…20c, 34 We believe that, in general, caution should be taken when interpreting Raman vibrational data from alkali metal biphenyl adducts, since the high intensity of the Raman excitatory laser radiation combined with a very high absorbance of the sample at the laser wavelength may trigger an extensive photoelectron detachment and a photostationary state dominated by the radical anion. Indeed, photoelectron detachment has been reported and described for sodium biphenyl adducts in DME.…”