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  • Wiley-Blackwell  (3)
  • American Institute of Physics (AIP)  (1)
  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 5519-5523 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Raman spectra of self-associates of guanosine were investigated in the 5–200 cm−1 region together with crystals of guanosine⋅2H2O, Na2⋅5'–UMP⋅7H2O, Na2⋅5'–GMP⋅7H2O, Na2⋅5'–CMP⋅8H2O, Na2⋅5'–dGMP⋅4H2O, and Na2⋅ATP⋅3H2O, to clarify the origin of the lowest Raman active mode of deoxyribonucleic nucleic acid (DNA). When the bases stack well to form a column, as in guanosine self-associates and crystals of guanosine and adenosine triphosphate (ATP), the spectral patterns are similar to that of DNA. The lowest-frequency bands are sharp and isolated from other bands. The result suggests that the origin of the lowest-frequency mode of DNA is assigned to the motion of bases stacked in a column. Guanosine has no phosphate groups, and ATP has no hydrogen bonds between bases in the crystal state. Therefore, neither hydrogen bonds between bases nor phosphate groups are necessary for the existence of this mode.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Raman spectra of poly(L-lysine) with various structures, ionized poly(L-glutamic acid), and deuterated N-methylacetamides have been observed using visible and the 257.3-nm laser lines as the light source. Most of the Raman bands with significantly enhanced intensities in the uv-excited spectra of the polymers have been assigned to the vibrations associated with the C=O and C-N stretching modes, the amide I, II, III, I′, II′, and III′, with reference to the results obtained for simple amide molecules including the deuterated N-methylacetamides. Several amide frequencies have been newly identified and the structures of the polymers have been discussed through the comparison of the Raman and ir amide frequencies.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Low-frequency Raman spectra of the self-associates of guanosine monophosphates (GMPs) Na2 · 5′GMP, K2 · 5′GMP, Na2 · 3′GMP, and K2 · 3′GMP, and polyribonucleic acid K · poly(rG), were obtained. In acidic gels and dried fibers, GMP molecules are known to form helical stacks of hydrogen-bonded tetramers. Some low-frequency collective modes specific to the helically stacked structures were observed. We examined the dependence of these modes on counterions and water content. The lowest frequency mode at ca. 20 cm-1 is sensitive to the water content of the sample and is clearly visible in solid-state samples, so it works as a marker band of the environmental condition of the helices. The intensity and the peak frequency of this mode in solid-state samples depend on the helical structure and counterions. The broad peaks in the vicinity of 100 cm-1 are influenced by cations and are independent of water content.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 4 (1975), S. 91-98 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of N-methylacetamide, N-ethylacetamide, and N-methylpropionamide have been recoraed using the laser lines at 6471 Å, 4765 Å, 4762 Å, 3507 Å. and 2573 Å for excitation. Appreciable intensity enhancement has been observed for the amide I and III lines in the UV excited spectra; the amide II lines show up clearly in the spectra using 2573 Å excitation, and the G-methyl and N-methyl symmetric deformation lines are also enhanced. The possible usefulness of the Raman spectra of peptide molecules obtained using ultraviolet excitation is discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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