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

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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 languageEnglish
Pages (from-to)3547-3549
Number of pages3
JournalJournal of Physical Chemistry
Volume85
Issue number24
DOIs
StatePublished - 1981

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