Study of valence-level splitting in a porphin-type π-cation dimer by He(I) photoelectron spectroscopy
✍ Scribed by N.S. Hush; Agnes S. Cheung
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 350 KB
- Volume
- 47
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The He(I) photoelectron spectraof a silicon phthalocyanine monomer (I) and a silicon phthalocyanine dimer (II), in which the two macrocyclic rings are appro~ately 3.32.4 apart, have been obtained. The Iowest verticai ionization of I, which yields a n-cation with calcuIated 'A fu ground state symmetry, occurs at 6.42 eV. This band is split in the dimer fE into two of roughly equal intensity at 6.19 and 6.5 1 eV, the transannuiar interaction energy being thus 0.32 eV_ The spfitting pattern in this porphin-type x-cation dimer, and the possibility that in condensed phases ions of similar type may have a trapped-hole structure, are discussed.