EPR and optical studies of Nickel(II) at 300K

Pandi, Manochitra; Ramachitra, Somasundaram; Kathirvelu, Velavan

doi:10.1016/j.saa.2012.08.062

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…In some cases where D > H o , a trial and error method has been employed to achieve the spin Hamiltonian parameters. [51,55,56] In conjunction with the EPR analysis, the optical absorption study has provided solid evidence about the symmetry of the coordination environment and the nature of chemical bonds. [49,56,57] N-containing heterocycle molecules have unique structural scaffolds.…”

Section: Introductionmentioning

confidence: 99%

“…[51,55,56] In conjunction with the EPR analysis, the optical absorption study has provided solid evidence about the symmetry of the coordination environment and the nature of chemical bonds. [49,56,57] N-containing heterocycle molecules have unique structural scaffolds. They are found widely in natural products such as hormones, alkaloids, and vitamins.…”

Section: Introductionmentioning

confidence: 99%

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Interpretation of EPR and optical spectra of Ni(II) ions in crystalline lattices at ambient temperature

Kathirvelu

2021

Magnetic Reson in Chemistry

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Many biologically important paramagnetic metal ions are characterized by electron paramagnetic resonance (EPR) spectroscopy to use as spin probes to investigate the structure and function of biomolecules. Though nickel(II) ions are an essential trace element and part of many biomolecules, the EPR properties are least understood. Herein, the EPR and optical absorption spectra measured at 300 K for Ni(II) ions diluted in two different diamagnetic hosts are investigated and reported. The EPR spectrum of a polycrystalline Ni/Mg (3-methylpyrazole) 6 (ClO 4 ) 2 [Ni/MMPC] shows two transitions at X-band frequency ($9.5 GHz), suggesting the zero-field splitting parameter (D) is larger than the resonance field of the free electron (H o ). This incomplete and complex spectrum is successfully analyzed to obtain EPR parameters. The EPR spectrum of the polycrystalline Ni/Zn(pyrazole) 6 (NO 3 ) 2 [Ni/ZPN] shows a triplet spectrum indicating D < H o . A detailed analysis of single-crystal EPR data yielded the spin Hamiltonian parameters. The optical absorption spectra are deconvoluted to understand the symmetry of the coordination environment in the complex.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interpretation of EPR and optical spectra of Ni(II) ions in crystalline lattices at ambient temperature

Kathirvelu

2021

Magnetic Reson in Chemistry

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“…Nickel(II) ion has been incorporated in a few crystalline lattices and has a zero field splitting ( D ) smaller enough to show allowed EPR transitions at X‐band frequency. Hence, only few systems have been studied well using EPR spectroscopy, and spin Hamiltonian parameters are reported. EPR studies of some pure Ni(II) octahedral complexes have also been reported in literature.…”

Section: Introductionmentioning

confidence: 99%

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

Kathirvelu

2020

Magnetic Reson in Chemistry

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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.

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Synthesis, spectroscopic study and carbofuran adsorption of mixed metal (Co, Cu)@Ca-BTC frameworks aimed at wastewater cleaning

Emam,

Koto,

Sebok-Nagy

et al. 2024

Journal of Industrial and Engineering Chemistry

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EPR and optical studies of Nickel(II) at 300K

Cited by 4 publications

References 16 publications

Interpretation of EPR and optical spectra of Ni(II) ions in crystalline lattices at ambient temperature

Interpretation of EPR and optical spectra of Ni(II) ions in crystalline lattices at ambient temperature

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

Synthesis, spectroscopic study and carbofuran adsorption of mixed metal (Co, Cu)@Ca-BTC frameworks aimed at wastewater cleaning

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