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IR-UV double resonance spectroscopic investigation of phenylacetylene-alcohol complexes. Alkyl group induced hydrogen bond switching

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Title IR-UV double resonance spectroscopic investigation of phenylacetylene-alcohol complexes. Alkyl group induced hydrogen bond switching
 
Creator SINGH, PC
PATWARI, GN
 
Subject vibrational-spectra
benzene
clusters
water
fluorobenzene
systems
shifts
 
Description The electronic transitions of phenylacetylene complexes with water and trifluoroethanol are shifted to the blue, while the corresponding transitions for methanol and ethanol complexes are shifted to the red relative to the phenylacetylene monomer. Fluorescence dip infrared (FDIR) spectra in the O-H stretching region indicate that, in all the cases, phenylacetylene is acting as a hydrogen bond acceptor to the alcohols. The FDIR spectrum in the acetylenic C-H stretching region shows Fermi resonance bands for the bare phenylacetylene, which act as a sensitive tool to probe the intermolecular structures. The FDIR spectra reveal that water and trifluoroethanol interact with the pi electron density of the acetylene C-C triple bond, while methanol and ethanol interact with the pi electron density of the benzene ring. It can be inferred that the hydrogen bonding acceptor site on phenlacetylene switches from the acetylene pi to the benzene pi with lowering in the partial charge on the hydrogen atom of the OH group. The most significant finding is that the intermolecular structures of water and methanol complexes are notably distinct, which, to the best of our knowledge, this is first such observation in the case of complexes of substituted benzenes.
 
Publisher AMER CHEMICAL SOC
 
Date 2011-07-14T09:25:43Z
2011-12-26T12:48:19Z
2011-12-27T05:48:43Z
2011-07-14T09:25:43Z
2011-12-26T12:48:19Z
2011-12-27T05:48:43Z
2008
 
Type Article
 
Identifier JOURNAL OF PHYSICAL CHEMISTRY A, 112(23), 5121-5125
1089-5639
http://dx.doi.org/10.1021/jp800968g
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3920
http://hdl.handle.net/10054/3920
 
Language en