Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 134, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3583642
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan [21685001]
- Inamori Foundation
- Grants-in-Aid for Scientific Research [21685001] Funding Source: KAKEN
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We observed the low-frequency Raman-active intermolecular vibrational modes of 7-azaindole in CCl4 by femtosecond Raman-induced Kerr effect spectroscopy. To understand the dynamical aspects and vibrational modes of 7-azaindole in the solution, the ultrafast dynamics of 1-benzofuran in CCl4 was also examined as a reference and ab initio quantum chemistry calculations were performed for 7-azaindole and 1-benzofuran. The cooperative hydrogen-bonding vibrational bands of 7-azaindole dimer in CCl4 appeared at 89 cm(-1) and 105 cm(-1) represent the overlap of stagger and wheeling modes and the intermolecular stretching mode, respectively. They are almost independent of the concentration in the solution. We further found from the low-frequency differential Kerr spectra of the solutions with neat CCl4 that the intermolecular motion in the low frequency region below 20 cm(-1) was less active in the case of 7-azaindole/CCl4 than in the case of 1-benzofuran/CCl4. The slow orientational relaxation time in 7-azaindole/CCl4 is similar to 3.5 times that in 1-benzofuran/CCl4 because of the nature of the dimerization of 7-azaindole. (C) 2011 American Institute of Physics. [doi:10.1063/1.3583642]
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