Infrared Spectra of VnBzn+1Sandwich Clusters:  A Theoretical Study of Size Evolution

2005 ◽  
Vol 109 (45) ◽  
pp. 10180-10182 ◽  
Author(s):  
Jinlan Wang ◽  
Julius Jellinek
Keyword(s):  
Infrared Spectra ◽  
Theoretical Study ◽  
Size Evolution

A theoretical study of the infrared spectra of guanine tautomers

1993 ◽  
Vol 49 (12) ◽  
pp. 1727-1734 ◽  
Author(s):  
Ian R. Gould ◽  
Mark A. Vincent ◽  
Ian H. Hillier
Keyword(s):  
Infrared Spectra ◽  
Theoretical Study

Theoretical Study of Far-Infrared Spectra of Some Palladium and Platinum Halide Complexes

2002 ◽  
Vol 106 (15) ◽  
pp. 3819-3822 ◽  
Author(s):  
Lin Zhang ◽  
Hua Wei ◽  
Yu Zhang ◽  
Zijian Guo ◽  
Longgen Zhu
Keyword(s):  
Infrared Spectra ◽  
Theoretical Study ◽  
Far Infrared ◽  
Halide Complexes ◽  
Far Infrared Spectra

Theoretical Study of Infrared Spectra of OCS-(pH2)2, OCS-(oD2)2, OCS-(HD)2, and Mixed OCS-pH2-He Trimers

2018 ◽  
Vol 122 (11) ◽  
pp. 2915-2926 ◽  
Author(s):  
Jing-Min Liu ◽  
Xiao-Long Zhang ◽  
Yu Zhai ◽  
Hui Li
Keyword(s):  
Infrared Spectra ◽  
Theoretical Study

Infrared spectra of tautomers and rotamers of 9-methylguanine. An experimental and theoretical study

1991 ◽  
Vol 69 (11) ◽  
pp. 1705-1720 ◽  
Author(s):  
K. Szczepaniak ◽  
M. Szczesniak ◽  
W. Szajda ◽  
W. B. Person ◽  
J. Leszczynski
Keyword(s):  
Absorption Spectrum ◽  
Ab Initio ◽  
Infrared Spectra ◽  
Electronic Absorption ◽  
Ab Initio Calculation ◽  
Theoretical Study ◽  
Free Energies ◽  
Argon Matrix ◽  
Tautomeric Forms ◽  
Infrared Studies

Both amino-oxo and amino-hydroxy tautomeric forms of 9-methylguanine have been identified in approximately equal abundance in. infrared studies of these molecules isolated in the hydrophobic environment of an argon matrix at 12 K. The amino-hydroxy tautomer occurs in two different rotamers correlated with the rotation of the OH group. The ratio of concentrations of the two rotamers is sensitive to UV irradiation, and this ratio then relaxes to an equilibrium value after irradiation is stopped. This sensitivity allows us to separate the experimental spectra related to the oxo tautomer and to each of the rotamers of the hydroxy tautomer. The relative concentrations of the amino-oxo and amino-hydroxy tautomers ([a-o]/[a-h] = K(o-h) = 1.0 ± 0.3) and of the two rotamers (K(h1-h2) = 0.31 ± 0.10 in an argon matrix at 12 K and about 30 ± 15 in the vapor at 470 K) are estimated from the observed relative infrared absorbances. From these relative concentrations the differences between the free energies of the tautomers (ΔG470 (o-h) = 0 ± 0.5 kJ mol−1) and of the two rotamers (ΔG(h1-h2) = 0.12 ± 0.03 kJ mol−1 in the argon matrix at 12 K and ΔG470 between +2 and −13 kJ mol−1 in the vapor at 470 K) have been estimated. The electronic absorption spectrum of 9-methylguanine isolated in the argon matrix at 12 K and the effect of brief ultraviolet irradiation on it have also been studied. In an effort to interpret the experimental results, ab initio calculations of the infrared spectra have been made for 9-methylguanine at the 3-21G//3-21G level. Comparison with the experimental spectra is of some help with the assignment of the infrared spectra for the different tautomers. Key words: 9-methylguanine, tautomerism, infrared and ultraviolet spectra, matrix isolation, ab initio calculation.

A theoretical study of C3 molecule trapped in rare gas matrices: Influence of bent or linear configuration on the infrared spectra

1998 ◽  
Vol 229 (2-3) ◽  
pp. 347
Author(s):  
A. Lakhlifi ◽  
R. Dahoo ◽  
M. Vala ◽  
J. Szczepanski ◽  
S. Ekern
Keyword(s):  
Infrared Spectra ◽  
Theoretical Study ◽  
Rare Gas ◽  
Linear Configuration
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