Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 109, Issue 13, Pages 3038-3044Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp0448696
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Mid-infrared spectra of mixed solutions in liquid xenon containing fluoroform and either ammonia or pyridine have been investigated at temperatures between 173 and 213 K. For both Lewis bases, a new band is found in the CH stretching region at a frequency approximately 5 cm(-1) higher than that of monomer fluoroform, which is assigned to a complex between fluoroform and the Lewis base. A detailed analysis of the v(1)/2v(4) Fermi resonance in the proton donor shows that the blue shifts observed for the complexes are not caused by a strengthening of the CH bond during the complexation, but are due to the changes in the Fermi resonance interactions. Information on the v(1)/2v(4) Fermi resonance was also obtained for the complexes of fluoroform with dimethyl ether and trimethyl amine.
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