Electron paramagnetic resonance of the excited states of the three-spins-1/2 ZnTPP-3-NOPy complex

V. F. Tarasov; I. S.M. Saiful; Y. Ohba; K. Takahashi; S. Yamauchi

doi:10.1016/j.saa.2007.09.026

Electron paramagnetic resonance of the excited states of the three-spins-1/2 ZnTPP-3-NOPy complex

V. F. Tarasov, I. S.M. Saiful, Y. Ohba, K. Takahashi, S. Yamauchi

Division of Measurements

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

EPR spectra of the excited quartet and doublet molecular states of (tetraphenylporphinato)zinc(II)covalently bounded to 3-(N-nitronyl-notroxide) pyridine stable radical are modeled in terms of the spin-Hamiltonian given by the sum of the contributions from the radical and triplet moieties, and the interaction between them. The later is represented by anisotropic point dipolar and isotropic exchange electron spin-spin interactions. It is shown that the high field (W-band) EPR spectra depend on energy separation between the electronic doublet (D) and quartet (Q) states. This dependence was utilized to estimate the upper limit of the intensity of exchange interaction between the radical and porphyrin moieties.

Original language	English
Pages (from-to)	1327-1330
Number of pages	4
Journal	Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume	69
Issue number	5
DOIs	https://doi.org/10.1016/j.saa.2007.09.026
Publication status	Published - 2008 May 1

Keywords

Electron spin polarization
Exchange interaction
Multi-spin excited molecular states
Nitroxide radical
Porphyrin

ASJC Scopus subject areas

Analytical Chemistry
Atomic and Molecular Physics, and Optics
Instrumentation
Spectroscopy

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title = "Electron paramagnetic resonance of the excited states of the three-spins-1/2 ZnTPP-3-NOPy complex",

abstract = "EPR spectra of the excited quartet and doublet molecular states of (tetraphenylporphinato)zinc(II)covalently bounded to 3-(N-nitronyl-notroxide) pyridine stable radical are modeled in terms of the spin-Hamiltonian given by the sum of the contributions from the radical and triplet moieties, and the interaction between them. The later is represented by anisotropic point dipolar and isotropic exchange electron spin-spin interactions. It is shown that the high field (W-band) EPR spectra depend on energy separation between the electronic doublet (D) and quartet (Q) states. This dependence was utilized to estimate the upper limit of the intensity of exchange interaction between the radical and porphyrin moieties.",

keywords = "Electron spin polarization, Exchange interaction, Multi-spin excited molecular states, Nitroxide radical, Porphyrin",

author = "Tarasov, {V. F.} and Saiful, {I. S.M.} and Y. Ohba and K. Takahashi and S. Yamauchi",

year = "2008",

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TY - JOUR

T1 - Electron paramagnetic resonance of the excited states of the three-spins-1/2 ZnTPP-3-NOPy complex

AU - Tarasov, V. F.

AU - Saiful, I. S.M.

AU - Ohba, Y.

AU - Takahashi, K.

AU - Yamauchi, S.

PY - 2008/5/1

Y1 - 2008/5/1

N2 - EPR spectra of the excited quartet and doublet molecular states of (tetraphenylporphinato)zinc(II)covalently bounded to 3-(N-nitronyl-notroxide) pyridine stable radical are modeled in terms of the spin-Hamiltonian given by the sum of the contributions from the radical and triplet moieties, and the interaction between them. The later is represented by anisotropic point dipolar and isotropic exchange electron spin-spin interactions. It is shown that the high field (W-band) EPR spectra depend on energy separation between the electronic doublet (D) and quartet (Q) states. This dependence was utilized to estimate the upper limit of the intensity of exchange interaction between the radical and porphyrin moieties.

AB - EPR spectra of the excited quartet and doublet molecular states of (tetraphenylporphinato)zinc(II)covalently bounded to 3-(N-nitronyl-notroxide) pyridine stable radical are modeled in terms of the spin-Hamiltonian given by the sum of the contributions from the radical and triplet moieties, and the interaction between them. The later is represented by anisotropic point dipolar and isotropic exchange electron spin-spin interactions. It is shown that the high field (W-band) EPR spectra depend on energy separation between the electronic doublet (D) and quartet (Q) states. This dependence was utilized to estimate the upper limit of the intensity of exchange interaction between the radical and porphyrin moieties.

KW - Electron spin polarization

KW - Exchange interaction

KW - Multi-spin excited molecular states

KW - Nitroxide radical

KW - Porphyrin

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JO - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

JF - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

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