Isotopes of cobalt

Naturally occurring isotopes

This table shows information about naturally occuring isotopes, their atomic masses, their natural abundances, their nuclear spins, and their magnetic moments. Further data for radioisotopes (radioactive isotopes) of cobalt are listed (including any which occur naturally) below.
Isotope Atomic mass (ma/u) Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
59Co 58.9331976 (16) 100 7/2 4.627

In the above picture, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. This is not to be confused with the relative percentage isotope abundances which total 100% for all the naturally occurring isotopes.

Further data for naturally occuring isotopes of cobalt are listed above. This table gives information about some radiosotopes of cobalt, their masses, their half-lives, their modes of decay, their nuclear spins, and their nuclear magnetic moments.
Isotope Mass Half-life Mode of decay Nuclear spin Nuclear magnetic moment
55Co 54.942003 17.53 h EC to 55Fe 7/2 4.822
56Co 55.939844 77.3 d EC to 56Fe 4 3.85
57Co 56.936296 271.8 d EC to 57Fe 7/2 4.72
58Co 57.935757 70.88 d EC to 58Fe 2 4.04
60Co 59.933822 5.271 y β- to 60Ni 5 3.799
61Co 60.932479 1.650 h β- to 61Ni 7/2
62Co 61.93405 13.9 m β- to 62Ni 2

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References

1. Naturally occurring isotope abundances: Commission on Atomic Weights and Isotopic Abundances report for the International Union of Pure and Applied Chemistry in Isotopic Compositions of the Elements 1989, Pure and Applied Chemistry, 1998, 70, 217. [Copyright 1998 IUPAC]
2. For further information about radioisotopes see Jonghwa Chang's (Korea Atomic Energy Research Institute) Table of the Nuclides
3. Masses, nuclear spins, and magnetic moments: I. Mills, T. Cvitas, K. Homann, N. Kallay, and K. Kuchitsu in Quantities, Units and Symbols in Physical Chemistry, Blackwell Scientific Publications, Oxford, UK, 1988. [Copyright 1988 IUPAC]

NMR Properties of cobalt

Common reference compound: K3[Co(CN)6]/D2O.

Isotope 1 Isotope 2 Isotope 59Co Natural abundance /% 100 Spin (I) 7/2 Frequency relative to 1H = 100 (MHz) 23.727072 Receptivity, DP, relative to 1H = 1.00 0.278 Receptivity, DC, relative to 13C = 1.00 1590 Magnetogyric ratio, γ (107 rad T-1 s-1) 6.332 Magnetic moment, μ (μN) 5.247 Nuclear quadrupole moment, Q/millibarn +420(30) Line width factor, 1056l (m4) 0.022

References

1. R.K. Harris in Encyclopedia of Nuclear Magnetic Resonance, D.M. Granty and R.K. Harris, (eds.), vol. 5, John Wiley & Sons, Chichester, UK, 1996. I am grateful to Professor Robin Harris (University of Durham, UK) who provided much of the NMR data, which are copyright 1996 IUPAC, adapted from his contribution contained within this reference.
2. J. Mason in Multinuclear NMR, Plenum Press, New York, USA, 1987. Where given, data for certain radioactive nuclei are from this reference.
3. P. Pyykkö, Mol. Phys., 2008, 106, 1965-1974.
4. P. Pyykkö, Mol. Phys., 2001, 99, 1617-1629.
5. P. Pyykkö, Z. Naturforsch., 1992, 47a, 189. I am grateful to Professor Pekka Pyykkö (University of Helsinki, Finland) who provided the nuclear quadrupole moment data in this and the following two references.
6. D.R. Lide, (ed.), CRC Handbook of Chemistry and Physics 1999-2000 : A Ready-Reference Book of Chemical and Physical Data (CRC Handbook of Chemistry and Physics, CRC Press, Boca Raton, Florida, USA, 79th edition, 1998.
7. P. Pyykkö, personal communication, 1998, 204, 2008, 2010.
8. The isotopic abundances are extracted from the naturally occurring isotopes section within WebElements.

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