| Autor: |
Koper, Carola, Sarobe, Martin, Jenneskens, Leonardus W. |
| Zdroj: |
Physical Chemistry Chemical Physics (PCCP); 2004, Vol. 6 Issue: 2 p319-327, 9p |
| Abstrakt: |
The redox properties of 23 alternant PAH and non-alternant mono- and bis-CP-PAH that contain annelated peripheral pentagons were determined using cyclic voltammetry. The results show that peripheral cyclopenta-fusion markedly enhances their electron affinity. Unexpectedly for the non-alternant PAH, a good linear correlation between the first reduction potential E120−1 V vs.SCE and their standard Hückel LUMO energy (−LUMOβ) is found. This indicates that the peripheral pentagons perturb the LUMO of the original alternant PAH core in a systematic fashion. A survey of the reduction behaviour of the mono- and bis-CP-PAH reveals that upon reduction the effect of the cyclopenta-moiety on the remainder of the molecule becomes negligible. Evidence for the formation of 6π-electron cyclopentadienide sub-structures is obtained, i.e.localization of the added electrons in the peripheral pentagons occurs. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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