Nuclear quadrupole coupling in an EPR investigation of a low-spin cobalt(II) system

Edward P. Duliba, Edmund G. Seebauer, R. Linn Belford

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Abstract

The nuclear quadrupole coupling constants for a low-spin square planar cobalt(II) compound were determined by EPR spectroscopy. Oriented single crystals and powders of Co-doped [(C2H5)4N]2Ni(S2C4N2)2 were examined and their EPR spectra interpreted with the following spin Hamiltonian: H = βB·g·S + hI·A·S - gnβnB·I + hQD(Iz2 - 63 4) + hQE(Iz2 - Iy2) with parameters gx = 2.7822, gy = 2.0130, gz = 1.9815, Ax = 131.8 MHz, Ay = 69.0 MHz, Az = 59.5 MHz, QD = -0.9 MHz, and QE = 0.2 MHz, where the principal axis systems for A and Q coincide with that of g. The quadrupole coupling parameters are compared with other available examples and the general absence of quadrupolar effects in the EPR of other low-spin cobalt(II) single crystals discussed.

Original languageEnglish (US)
Pages (from-to)507-516
Number of pages10
JournalJournal of Magnetic Resonance (1969)
Volume49
Issue number3
DOIs
StatePublished - Oct 1 1982

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Cobalt
Paramagnetic resonance
Cobalt compounds
Single crystals
Hamiltonians
Powders
Spectroscopy

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Nuclear quadrupole coupling in an EPR investigation of a low-spin cobalt(II) system. / Duliba, Edward P.; Seebauer, Edmund G.; Linn Belford, R.

In: Journal of Magnetic Resonance (1969), Vol. 49, No. 3, 01.10.1982, p. 507-516.

Research output: Contribution to journalArticle

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abstract = "The nuclear quadrupole coupling constants for a low-spin square planar cobalt(II) compound were determined by EPR spectroscopy. Oriented single crystals and powders of Co-doped [(C2H5)4N]2Ni(S2C4N2)2 were examined and their EPR spectra interpreted with the following spin Hamiltonian: H = βB·g·S + hI·A·S - gnβnB·I + hQD(Iz2 - 63 4) + hQE(Iz2 - Iy2) with parameters gx = 2.7822, gy = 2.0130, gz = 1.9815, Ax = 131.8 MHz, Ay = 69.0 MHz, Az = 59.5 MHz, QD = -0.9 MHz, and QE = 0.2 MHz, where the principal axis systems for A and Q coincide with that of g. The quadrupole coupling parameters are compared with other available examples and the general absence of quadrupolar effects in the EPR of other low-spin cobalt(II) single crystals discussed.",
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AU - Linn Belford, R.

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N2 - The nuclear quadrupole coupling constants for a low-spin square planar cobalt(II) compound were determined by EPR spectroscopy. Oriented single crystals and powders of Co-doped [(C2H5)4N]2Ni(S2C4N2)2 were examined and their EPR spectra interpreted with the following spin Hamiltonian: H = βB·g·S + hI·A·S - gnβnB·I + hQD(Iz2 - 63 4) + hQE(Iz2 - Iy2) with parameters gx = 2.7822, gy = 2.0130, gz = 1.9815, Ax = 131.8 MHz, Ay = 69.0 MHz, Az = 59.5 MHz, QD = -0.9 MHz, and QE = 0.2 MHz, where the principal axis systems for A and Q coincide with that of g. The quadrupole coupling parameters are compared with other available examples and the general absence of quadrupolar effects in the EPR of other low-spin cobalt(II) single crystals discussed.

AB - The nuclear quadrupole coupling constants for a low-spin square planar cobalt(II) compound were determined by EPR spectroscopy. Oriented single crystals and powders of Co-doped [(C2H5)4N]2Ni(S2C4N2)2 were examined and their EPR spectra interpreted with the following spin Hamiltonian: H = βB·g·S + hI·A·S - gnβnB·I + hQD(Iz2 - 63 4) + hQE(Iz2 - Iy2) with parameters gx = 2.7822, gy = 2.0130, gz = 1.9815, Ax = 131.8 MHz, Ay = 69.0 MHz, Az = 59.5 MHz, QD = -0.9 MHz, and QE = 0.2 MHz, where the principal axis systems for A and Q coincide with that of g. The quadrupole coupling parameters are compared with other available examples and the general absence of quadrupolar effects in the EPR of other low-spin cobalt(II) single crystals discussed.

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