Journal
CHEMICAL PHYSICS
Volume 313, Issue 1-3, Pages 225-243Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2005.01.011
Keywords
blue shift; H-bond; CH center dot center dot center dot B interactions; fluoroform; chloroform; methyl fluoride; liquid phase; SAPT decomposition
Ask authors/readers for more resources
The FTIR spectra of F3CH/FCD3 and Cl3CH/FCD3 mixtures have been studied in liquefied Kr in the range of frequencies similar to 500-10000cm(-1). Spectroscopic evidence of a weak H-bonded complex formation in the solutions studied have been found. The blue frequency shift of the C-v1-H stretching vibration and of the majority of the combination and overtone bands, with the (v1) vibration being excited, were revealed for both F3CH/FCD3 and Cl3CH/FCD3 complexes characterized by the opposite change in the integrated intensity of the (v1) band. The effects observed are treated in the frame of features of the dipole moment function of molecules studied. In the case of both systems, ab initio MP2(Full)/6-31 +G(d,p) CP corrected calculations predict a linear structure and 2 non-linear stable structures with spectroscopic features being in qualitative agreement with experimental observations. Contributions of the components of the interaction energy in the frequency shift have been analysed by using the SAPT decomposition scheme. The NBO analysis performed suggests, that the competition between rehybridization/repolarization effect and hyperconjugation CT interaction might result in a transfer from the blue to red shift in the case of stronger H bonds. (c) 2005 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available