NMR Periodic Table: Molybdenum NMR

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Molybdenum NMR

PHYSICAL PROPERTIES

Isotope	Natural Abundance (%)	Nuclear Spin (I)	Magnetogyric ratio *(10⁷rad/Ts)*	Quadruple moment *(10²⁸Q/m²)**	Resonance frequency (MHz) at 11.744T (500 MHz for ¹H)	Relative sensitivity (¹H=1.00)	Absolute sensitivity (¹H=1.00)
⁹⁵Mo	15.92	5/2	1.751	0.022	32.574	3.23*10^-3	5.07*10^-4
⁹⁷Mo	9.55	5/2	-1.788	0.255	33.261	3.43*10^-3	3.24*10^-4

APPLICATION FIELDS

The use of ⁹⁵Mo NMR spectroscopy on inorganic and organometallic molybdenum-containing compounds is hampered by the quadrupole moment of this nucleus which causes very broad lines that can be difficult to detect. However, relatively sharp lines can be obtained from high symmetric compounds.

NMR REFERENCES

2M Na₂MoO₄ in D₂O at pD=11 is used as an external reference sample. Its absolute frequency is 6.516926 MHz with respect to 100.00 MHz for TMS. Also see IUPAC recommendations for reporting the NMR chemical shits of all nuclei relative to the ¹H resonance of TMS (02JMR323-156).

NMR PARAMETERS

Some interesting features of the Mo nucleus are:

⁹⁵Mo chemical shifts cover a range of 6700ppm (from +3700ppm to -3000ppm).

Short T₂ values.

NMR EXPERIMENTS

1D ⁹⁵Mo spectrum

BIBLIOGRAPHY

Interesting review: B91PRE59
⁹⁵Mo NMR in homo- and heteronuclear clusters ( B96GIE313).
The Transition Metals NMR: B79HAR195.

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