Article

Ultraviolet and infrared photodissociation of Si(+)(C6H6)n and Si(+)(C6H6)(n)Ar clusters.

Department of Chemistry, University of Georgia, Athens, Georgia 30602-2556, USA.
The Journal of Physical Chemistry A (impact factor: 2.95). 04/2005; 109(12):2801-8. DOI:10.1021/jp044798a pp.2801-8
Source: PubMed

ABSTRACT Ion-molecule complexes of the form Si(+)(C6H6)n and Si(+)(C6H6)(n)Ar are produced by laser vaporization in a pulsed nozzle cluster source. These clusters are mass-selected and studied with ultraviolet (355 nm) photodissociation and resonance-enhanced infrared photodissociation spectroscopy in the C-H stretch region of benzene. In the UV, Si(+)(C6H6)n clusters (n = 1-5) fragment to produce the Si(+)(C6H6)n mono-ligand species, suggesting that this ion has enhanced relative stability. IR photodissociation of Si(+)(C6H6)n complexes occurs by the elimination of benzene, while Si(+)(C6H6)(n)Ar complexes lose Ar. Resonances reveal C-H vibrational bands in the 2900-3300 cm(-1) region characteristic of the benzene ligand with shifts caused by the silicon cation bonding. The IR spectra confirm that the major component of the Si(+)(C6H6)n ions studied have the pi-complex structure rather than the isomeric insertion products suggested previously.

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Keywords

Ar
 
C-H stretch region
 
C-H vibrational bands
 
clusters
 
isomeric insertion products
 
laser vaporization
 
major component
 
pi-complex structure
 
pulsed nozzle cluster source
 
relative stability
 
resonance-enhanced infrared photodissociation spectroscopy
 
Si(+)(C6H6)n mono-ligand species
 
silicon cation
 

J B Jaeger