Electron spin relaxation time of Ni(II) ion in hexapyrazole zinc(II) dinitrate at 300 K

Understanding the electron spin relaxation properties of paramagnetic species is a fundamental requirement to use them as a probe to measure distances between sites in biomolecules by electron paramagnetic resonance (EPR) spectroscopy. Even though Ni(II) ion is an essential trace element for many sp...

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Bibliographic Details
Published in:Magnetic resonance in chemistry 2020-04, Vol.58 (4), p.329-333
Main Authors: K, Amrutha, Kathirvelu, Velavan
Format: Article
Language:English
Subjects:
Biomolecules
CW EPR power saturation
Electron paramagnetic resonance
Electron spin
electron spin relaxation time
Electrons
EPR spectroscopy
nickel(II)
non‐Kramer ion
Pyrazole
Relaxation time
Spectrum analysis
Trace elements
Zinc
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Summary:Understanding the electron spin relaxation properties of paramagnetic species is a fundamental requirement to use them as a probe to measure distances between sites in biomolecules by electron paramagnetic resonance (EPR) spectroscopy. Even though Ni(II) ion is an essential trace element for many species, relaxation properties are not well understood. Herein, the polycrystalline sample of Ni(II) ion magnetically diluted in Zn(Pyrazole)6(NO3)2 (Ni/ZPN) has been studied in detail by EPR spectroscopy to explore the electron spin relaxation time. Progressive continuous‐wave (CW) EPR power saturation study on Ni/ZPN at 300 K yielded 907 mW as the P1/2 value. The cavity constant (KQ) has been calculated using tempol in PVA‐BA glass matrix and the product of electron spin‐lattice relaxation time (T1) and spin–spin relaxation time (T2) for Ni/ZPN at 300 K has been reported for the first time. CW EPR studies of Ni(II) ion in hexapyrazole zinc(II) dinitrate show a complete triplet spectrum at X‐band frequency. The power saturation study reveals that this non‐Kramer ion is having unusually long electron spin relaxation time even at 300 K
ISSN:0749-1581
1097-458X
DOI:10.1002/mrc.5007