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Ground-state high-spin iron (III) octaethylporphyrin as studied by single-crystal cw/pulsed ESR spectroscopy

TitleGround-state high-spin iron (III) octaethylporphyrin as studied by single-crystal cw/pulsed ESR spectroscopy
Publication TypeJournal Article
Year of Publication2001
AuthorsNishio, T, Yokoyama, S, Sato, K, Shiomi, D, Ichimura, AS, Lin, WC, Dolphin, D, McDowell, CA, Takui, T
JournalSynthetic Metals
Volume121
Pagination1820-1821
Date PublishedMar
Type of ArticleProceedings Paper
ISBN Number0379-6779
Keywordselectron spin resonance, HEME
Abstract

The g-tensor and relaxation mechanism of ground-state high-spin [Fe(III)OEP]Cl (OEP:octaethylporphyrin) magnetically diluted in diamagnetic NI(IT)OEP single crystals were determined by cw- and pulsed-ESR spectroscopy. From cw-ESR measurements the degree of the rhombicity in fine-structure interaction was determined. It was suggested that the rhombicity is attributable to the pseudo Jahn-teller effect and that the line broadening with increasing temperature is due to the dynamic Jahn-Teller phenomenon among the distorted structures. The large fine-structure constant D was determined to be +7 cm(-1) by measuring the dependences of the spin-lattice relaxation rate on the temperature with the magnetic field perpendicular to the porphyrin plane. The spin-lattice relaxation times highly depend on the direction of the static magnetic field. The orientation dependence was interpreted in terms of the spin sublevel mixing by the spin-orbit interaction.

URL<Go to ISI>://000168831200341