A search for the thermally populated high-spin excited state of Co(H2O)63+ by cobalt-59 NMR

Gil Navon

doi:10.1021/j150624a001

A search for the thermally populated high-spin excited state of Co(H₂O)₆³⁺ by cobalt-59 NMR

Gil Navon^*

^*Corresponding author for this work

School of Chemistry

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

⁵⁹Co NMR signal of Co(H₂O)₆³⁺ was observed and the chemical shift and the spin-lattice relaxation time were recorded as a function of temperature. No deviation due to an exchange with paramagnetic high-spin cobalt(III) could be observed in the chemical shift. An increase in the spin-lattice relaxation rate was observed at high temperatures. However, following the dependence of the relaxation rates on acid concentration, this increase was associated with an increased formation of Co(H₂O)₅OH²⁺ at high temperatures. An approximate upper limit for the fractin of Co(H₂O)₆³⁺ which is present as high spin was estimated as f < 10^-4.

Original language	English
Pages (from-to)	3547-3549
Number of pages	3
Journal	Journal of Physical Chemistry
Volume	85
Issue number	24
DOIs	https://doi.org/10.1021/j150624a001
State	Published - 1981

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title = "A search for the thermally populated high-spin excited state of Co(H2O)63+ by cobalt-59 NMR",

abstract = "59Co NMR signal of Co(H2O)63+ was observed and the chemical shift and the spin-lattice relaxation time were recorded as a function of temperature. No deviation due to an exchange with paramagnetic high-spin cobalt(III) could be observed in the chemical shift. An increase in the spin-lattice relaxation rate was observed at high temperatures. However, following the dependence of the relaxation rates on acid concentration, this increase was associated with an increased formation of Co(H2O)5OH2+ at high temperatures. An approximate upper limit for the fractin of Co(H2O)63+ which is present as high spin was estimated as f < 10-4.",

author = "Gil Navon",

year = "1981",

doi = "10.1021/j150624a001",

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journal = "Journal of Physical Chemistry",

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T1 - A search for the thermally populated high-spin excited state of Co(H2O)63+ by cobalt-59 NMR

AU - Navon, Gil

PY - 1981

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N2 - 59Co NMR signal of Co(H2O)63+ was observed and the chemical shift and the spin-lattice relaxation time were recorded as a function of temperature. No deviation due to an exchange with paramagnetic high-spin cobalt(III) could be observed in the chemical shift. An increase in the spin-lattice relaxation rate was observed at high temperatures. However, following the dependence of the relaxation rates on acid concentration, this increase was associated with an increased formation of Co(H2O)5OH2+ at high temperatures. An approximate upper limit for the fractin of Co(H2O)63+ which is present as high spin was estimated as f < 10-4.

AB - 59Co NMR signal of Co(H2O)63+ was observed and the chemical shift and the spin-lattice relaxation time were recorded as a function of temperature. No deviation due to an exchange with paramagnetic high-spin cobalt(III) could be observed in the chemical shift. An increase in the spin-lattice relaxation rate was observed at high temperatures. However, following the dependence of the relaxation rates on acid concentration, this increase was associated with an increased formation of Co(H2O)5OH2+ at high temperatures. An approximate upper limit for the fractin of Co(H2O)63+ which is present as high spin was estimated as f < 10-4.

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JO - Journal of Physical Chemistry

JF - Journal of Physical Chemistry

IS - 24

ER -

A search for the thermally populated high-spin excited state of Co(H₂O)₆³⁺ by cobalt-59 NMR

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