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Laser-Desorption Supersonic Jet Spectroscopy of Phthalocyanines

✍ Scribed by Fiona L. Plows; Anita C. Jones

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
106 KB
Volume
194
Category
Article
ISSN
0022-2852

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✦ Synopsis

The laser-induced fluorescence excitation spectra of zinc phthalocyanine, chloroaluminum phthalocyanine, magnesium phthalocyanine, and free-base phthalocyanine have been investigated under jet-cooled conditions, by using pulsed infrared laser desorption as the means of vaporization. Assignment of the observed vibronic transitions reveals that many of them gain intensity from coupling of the S 1 (Q) state with the S 2 (B) and QЈ states. Low-frequency out-of-plane modes of the macrocycle are observed in the region below 100 cm Οͺ1 ; the vibronic structure in this region of the spectrum is sensitive to deviation of the molecule from a planar geometry. The S 1 -S 0 excitation energy shows a weak dependence on the hole size of the macrocycle.

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