Variable Temperature Single Crystal EPR Studies of Cu(II) in Dipotassium Diaquabis(Malonato-κ2O,O′) Nickelate Dihydrate: An Example of Contaminated Ground State
- Authors: Natarajan B.1
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Affiliations:
- Department of Chemistry, SRM University
- Issue: Vol 48, No 1 (2017)
- Pages: 35-50
- Section: Original Paper
- URL: https://journal-vniispk.ru/0937-9347/article/view/247611
- DOI: https://doi.org/10.1007/s00723-016-0843-z
- ID: 247611
Cite item
Abstract
Single crystal X-band electron paramagnetic resonance (EPR) studies on divalent copper ions embedded in dipotassium diaquabis(malonato-κ2O,O′) nickelate dihydrate have been performed at 300, 123 and 77 K to understand the nature of Jahn–Teller distortion in the paramagnetic host lattice. The angular variation of the EPR spectra reveals the presence of two sites, with one site not showing hyperfine resolution even at 77 K. The spin-Hamiltonian parameters of this six-coordinated Cu(II) ion, evaluated from EPR spectra at various temperatures, are:
300 K: g11 = 2.125, g22 = 2.118, g33 = 2.290, no copper hyperfine resolution
123 K: g11 = 2.229, g22 = 2.113, g33 = 2.319 and A11 = 5.02, A22 = 3.82, A33 = 6.87 mT
77 K: g11 = 2.224, g22 = 2.114, g33 = 2.324 and A11 = 5.32, A22 = 3.90, A33 = 7.06 mT
About the authors
B. Natarajan
Department of Chemistry, SRM University
Author for correspondence.
Email: balanattunet@gmail.com
ORCID iD: 0000-0002-1401-1427
India, Kattankulathur, 603 203
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