Free-radical studies by resonance Raman spectroscopy. Photochemically generated N-substituted benzidine cation radicals

1981 ◽  
Vol 77 (3) ◽  
pp. 541 ◽  
Author(s):  
R. E. Hester ◽  
K. P. J. Williams
Keyword(s):  
Raman Spectroscopy ◽  
Free Radical ◽  
Resonance Raman Spectroscopy ◽  
Resonance Raman ◽  
Cation Radicals

Fast resonance Raman spectroscopy of a free radical

1975 ◽  
Vol 36 (1) ◽  
pp. 76-78 ◽  
Author(s):  
R. Wilbrandt ◽  
P. Pagsberg ◽  
K.B. Hansen ◽  
C.V. Weisberg
Keyword(s):  
Raman Spectroscopy ◽  
Free Radical ◽  
Resonance Raman Spectroscopy ◽  
Resonance Raman

scholarly journals The Carbonate, Co3−·, in Solution Studied by Resonance Raman Spectroscopy

1999 ◽  
Vol 19 (1-4) ◽  
pp. 311-316 ◽  
Author(s):  
Susan M. Tavender ◽  
Steven A. Johnson ◽  
Daniel Balsom ◽  
Anthony W. Parker ◽  
Roger H. Bisby
Keyword(s):  
Amino Acids ◽  
Raman Spectroscopy ◽  
Group Theory ◽  
Free Radical ◽  
Resonance Raman Spectroscopy ◽  
Resonance Raman ◽  
Point Group ◽  
Biological Significance ◽  
Molecular Symmetry ◽  
Resonance Raman Spectra

The carbonate radical (Co3−·) is of biological significance acting as an intermediate in free radical-mediated damage and is capable of oxidising amino acids and proteins. In order to distinguish between the four possible structures of Co3−·, nanosecond timeresolved resonance Raman (TR3) experiments were undertaken. Photolysis of persulphate at 250 nm generated the So4−· radical which then oxidised sodium carbonate. Resonance Raman spectra of the resulting Co3−· radical were obtained using a probe wavelength of 620 nm. Point group theory calculations and interpretation of the TR3 spectra suggest that the radical has C2v molecular symmetry.

Adsorption of benzidines and anilines on Cu- and Fe-montmorillonites studied by resonance Raman spectroscopy

Clay Minerals ◽  
1988 ◽  
Vol 23 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Y. Soma ◽  
M. Soma
Keyword(s):  
Raman Spectroscopy ◽  
Double Bond ◽  
Raman Spectra ◽  
Resonance Raman Spectroscopy ◽  
Resonance Raman ◽  
Vapour Phase ◽  
Acid Sites ◽  
Type Structure ◽  
Cation Radicals

AbstractResonance Raman spectroscopy has been used to observe the formation of cation radicals in the adsorption of N,N,N',N'-tetramethylbenzidine (TMBD), benzidine, N,Ndimethylaniline (DMA) and aniline on Na-, Cu- and Fe-montmorillonites. Cation radicals of benzidine and TMBD, and their dications were formed at acid sites on the montmorillonite surface, or through the reduction of Cu or Fe interlayer ions, and were adsorbed in the interlayer. Their structures are represented by biphenoquinone type structure, where the inter-ring CC bond and the ring C-N bond have double bond characters. It was demonstrated from Raman spectra that DMA and aniline adsorbed on Cu-montmorillonite from the vapour phase dimerize to form TMBD and benzidine dications.

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