ESR Spectra of Low-Symmetry High-Spin Cobalt(II) Complexes. 7. Trigonal-Bipyramidal Pentakis(Picoline N-Oxide)Cobalt(II) Perchlorate
Inorganic Chemistry, ISSN: 1520-510X, Vol: 19, Issue: 12, Page: 3839-3841
1980
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Article Description
We have recently started a program of characterization of the ESR spectra of high-spin cobalt(II) complexes and have found that octahedral and square-pyramidal complexes on one side and tetrahedral complexes on the other side are very sensitive to low symmetry components of the ligand field. In all the reported cases, the ESR spectra could be interpreted by using an S 1 = effective spin Hamiltonian. In particular tetrahedral complexes are characterized by g values ranging from 6.7 to 1.5, while square-pyramidal complexes can give g values higher and lower than these limits. Further the hyperfine splitting in tetrahedral complexes is in general small so that often it is not resolved, while it tends to be larger in octahedral and square-pyramidal complexes. Trigonal-bipyramidal complexes have an orbitally nondegenerate ground state, so that their ESR spectra should not be dissimilar from those of tetrahedral complexes. In order to verify if there is any possibility to discriminate between these two stereochemistries through ESR spectra, we wish to report. © 1980, American Chemical Society. All rights reserved.
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