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The mechanism of the S1 ⇝ Tx intersystem crossing process in aromatic hydrocarbons from PMDR

✍ Scribed by M.A. El-Sayed; W.R. Moomaw; J.B. Chodak

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
563 KB
Volume
20
Category
Article
ISSN
0009-2614

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✦ Synopsis

Using symmetry selection rules it is shown that the S r + TX intersystem crossing (ISC) process in (;:on-rotating) platrar condensed aromatic compounds with lowest states of the X,ZI * type leads to triplet states with the two unpaired electrons spinning in the molecular plane. Out-of-plane distortion is required to produce spin afignrnent in the two magnetic planes perpendicular to the molecular plane. The results of the pulsed excitation PXIDR method show that out-of-plane distortion enhances the S1 --+ TX ISC process in benzene, naphthalene, phenanthrene, triphenylene and coronene by a factor larger than five.

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