Fluorescence quenching by oxygen. Lack of evidence for the complex formation of oxygen with 9-cyanoanthracene and anthracene in a supersonic free jet

Urs Graf, Hiromichi Niikura, Satoshi Hirayama

研究成果: Article

8 引用 (Scopus)

抜粋

To elucidate the efficient quenching process of the fluorescence of large organic molecules by molecular oxygen, the electronic absorption spectra were measured for 9-cyanoanthracene (9CNA) and anthracene (A) in a supersonic free jet with the seeding gas consisting of a mixture of the rare gases Ne, He, Ar, or Xe and molecular oxygen. No new spectral feature assignable to van der Waals complexes with oxygen was found, though the cooling efficiency of oxygen itself was quite good. Various sizes and shapes of the pulsed nozzle were tested and led to the same result. A coincidental overlap of the complex band with the band of the bare molecules was ruled out. The 9CNA-Arn complexes with n = 1-3 were partially destroyed when oxygen was present in the mixture. At higher backing pressures, at which larger clusters were formed, the spectra observed suggest that oxygen can be accommodated within such a cluster and that the fluorescence of 9CNA was indeed quenched by the oxygen in the cluster. The lack of 9CNA-O2 or A-O2 complexes is discussed in comparison with the complex of 9CNA with iodine (I2) and CO2 formed in supersonic free jet.

元の言語English
ページ(範囲)1292-1298
ページ数7
ジャーナルJournal of Physical Chemistry A
101
発行部数7
DOI
出版物ステータスPublished - 1997 2 13
外部発表Yes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

フィンガープリント Fluorescence quenching by oxygen. Lack of evidence for the complex formation of oxygen with 9-cyanoanthracene and anthracene in a supersonic free jet' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用