Vibrational analysis and molecular force field of hypoxanthine as determined from ultraviolet resonance Raman spectra of native and deuterated species

1994 ◽  
Vol 23 (2) ◽  
Author(s):  
J. Ulicny ◽  
M. Ghomi ◽  
A. Tomkova ◽  
P. Miskovsky ◽  
P.Y. Turpin ◽  
...  
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Resonance Raman ◽  
Vibrational Analysis ◽  
Molecular Force ◽  
Resonance Raman Spectra ◽  
Molecular Force Field ◽  
Ultraviolet Resonance Raman

Resonance Raman spectra of highly reduced iron porphycenes

2006 ◽  
Vol 10 (11) ◽  
pp. 1271-1284 ◽  
Author(s):  
Rabbani M. Gulam ◽  
Saburo Neya ◽  
Junji Teraoka
Keyword(s):  
Raman Spectra ◽  
Anion Radical ◽  
Excited Electronic State ◽  
Resonance Raman ◽  
Vibrational Analysis ◽  
Redox States ◽  
Vis Spectroscopy ◽  
Vibrational Characteristics ◽  
Excitation Laser ◽  
Resonance Raman Spectra

The redox behavior of iron porphycenes using the sodium mirror contact technique is reported. The resonance Raman spectra are obtained for each redox state, in order to explore the vibrational characteristics of these species in different redox states. The observed resonance Raman behavior of Fe II porphycene anion radical and its dianion is interpreted using the vibrational analysis of free-base porphycene anion radical and dianion. For the first time, a species generated in the fourth reduction step, is confirmed by UV-vis spectroscopy and is assigned to Fe I porphycene π dianion. The dependence of resonance enhancements of Raman bands for the Fe I porphycene π dianion on excitation laser reveals structural distortion along the NC a C a N or C b C a C a C b segments of the pyrrole-pyrrole direct connection in the excited electronic state.

The vibrational resonance Raman spectra and the valence force field of iridium dichalcogenides, IrS2 and IrSe2

1991 ◽  
Vol 91 (1) ◽  
pp. 153-172 ◽  
Author(s):  
C. Sourisseau ◽  
R. Cavagnat ◽  
M. Fouassier ◽  
S. Jobic ◽  
P. Deniard ◽  
...  
Keyword(s):  
Force Field ◽  
Raman Spectra ◽  
Resonance Raman ◽  
Vibrational Resonance ◽  
Valence Force ◽  
Valence Force Field ◽  
Resonance Raman Spectra

Ultraviolet Resonance Raman Spectra of Escherichia Coli with 222.5–251.0 nm Pulsed Laser Excitation

1988 ◽  
Vol 42 (5) ◽  
pp. 782-788 ◽  
Author(s):  
K. A. Britton ◽  
R. A. Dalterio ◽  
W. H. Nelson ◽  
D. Britt ◽  
J. F. Sperry
Keyword(s):  
Escherichia Coli ◽  
Amino Acids ◽  
Nucleic Acid ◽  
Raman Spectra ◽  
Resonance Raman ◽  
Aromatic Amino Acids ◽  
Selective Excitation ◽  
Exciting Wavelength ◽  
Resonance Raman Spectra ◽  
Ultraviolet Resonance Raman

Resonance Raman spectra of the gram-negative organism, Escherichia coli, have been obtained with 222.5-, 230.6-, and 251.0-nm excitation, and the results have been compared with those reported earlier for 242.4-nm excitation. Major changes in bacterial spectra have been observed with changes in exciting wavelength. The origins of the major peaks in each spectrum have been explained primarily in terms of contributions of nucleic acid bases and aromatic amino acids. As an aid in making assignments, spectra of aromatic amino acids, nucleosides, and mixtures of the two have been obtained at each wavelength used to excite bacterial spectra. Background fluorescence has been observed to be negligible below 251 nm. Selective excitation of bacterial nucleic acid and protein components has been done with ease. Results suggest that an extension of the exciting wavelength range to 190–220 nm will allow the selective excitation of additional cell components.

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