Isotopes of molybdenum

The Molybdenum isotope Mo-95 is used for the production of the medical radioisotope Ru-97. Mo-96 is used for the production of the radioisotopes Tc-96 and Tc-95m, both of which have a medical application. Most Mo isotopes are also used in nutrition studies in humans. Depleted Mo-95 has been suggested for use in UMo fuel elements for materials test (high flux) reactors. Molybdenum isotopes can be obtained from Trace Sciences International.

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 molybdenum are listed (including any which occur naturally) below.
Isotope Atomic mass (ma/u) Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
92Mo 91.906809 (4) 14.84 (35) 0
94Mo 93.9050853 (26) 9.25 (12) 0
95Mo 94.9058411 (22) 15.92 (13) 5/2 -0.9142
96Mo 95.9046785 (22) 16.68 (2) 0
97Mo 96.9060205 (22) 9.55 (8) 5/2 -0.9335
98Mo 97.9054073 (22) 24.13 (31) 0
100Mo 99.907477 (6) 9.63 (23) 0

Isotopic abundances of Mo
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.

Radiosotope data

Further data for naturally occuring isotopes of molybdenum are listed above. This table gives information about some radiosotopes of molybdenum, 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
90Mo 89.91394 5.7 h EC to 90Nb 0
91Mo 90.91175 15.5 m EC to 91Nb 9/2
93Mo 92.906811 3500 y EC to 93Nb 5/2
99Mo 98.907711 2.7476 d β- to 97Tc 1/2 0.375

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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 molybdenum

Common reference compound: Na2MoO4/D2O.

Table of NMR-active nucleus propeties of molybdenum
  Isotope 1 Isotope 2 Isotope 3
Isotope 95Mo 97Mo
Natural abundance /% 15.92 9.55
Spin (I) 5/2 5/2
Frequency relative to 1H = 100 (MHz) 6.516942 6.653711
Receptivity, DP, relative to 1H = 1.00 0.000521 0.000333
Receptivity, DC, relative to 13C = 1.00 2.98 1.90
Magnetogyric ratio, γ (107 rad T-1 s-1) -1.751 -1.788
Magnetic moment, μ (μN) -1.082 -1.105
Nuclear quadrupole moment, Q/millibarn -22(1) +255(13)
Line width factor, 1056l (m4) 0.00015 0.0021

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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molybdenum atomic number