Journal
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
Volume 215, Issue -, Pages 777-793Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1524/zpch.2001.215.6.777
Keywords
molecular clusters; vibrational frequencies; C-H...pi; hydrogen bond; blue-shift; resonant 2 photon ionization; infrared (IR) depletion spectroscopy; double resonance
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Mixed clusters of benzene derivatives and trihalogenmethanes have been prepared in a supersonic beam and studied with infrared vibrational predissociation spectroscopy detected by resonant two photon ionization (IR/R2PI). We report the spectra of chloroform and fluoroform attached to the chromophores fluorobenzene, benzene, toluene, p-xylene and their deuterated analogues. Instead of the typical H-bonding induced red-shift of the CH stretching frequency a blue-shift is observed. From a comparison with ab initio calculations, we propose sandwich-like structures bonded by a C-H... jr hydrogen bond exhibiting an unusual partial charge transfer.
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