✦ LIBER ✦

Labile electronic ground state of the π-cation radical of zinc(II) tetraphenylporphyrin: a variable-temperature ESR investigation

✍ Scribed by PARESH C. DAVE; D. SRINIVAS

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 96 KB
Volume: 02
Category: Article
ISSN: 1088-4246
DOI: 10.1002/(sici)1099-1409(199805/06)2:3<243::aid-jpp83>3.0.co;2-k

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✦ Synopsis

The UV-vis and variable-temperature X-band EPR spectral studies (298-77 K) on p-cation of zinc(II) tetraphenylporphyrin (ZnTPP) have revealed for the first time a labile electronic ground state. The electronic structure changes from 2 A 2u to 2 A 1u as the temperature is lowered from 298 to 150 K. Axial ligands and '-donor solvents show a significant effect on the spectral data. The lability in the ground state electronic configuration is attributed to the flexibility of the porphyrin moiety in changing from a 'ruffled' to a lower symmetry.