NMR Periodic Table: Rhodium NMR

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Rhodium 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 protons)	Relative sensitivity (¹H=1.00)	Absolute sensitivity (¹H=1.00)
¹⁰³Rh	100	1/2	-0.8468	0	15.737	3.11*10^-5	3.11*10^-5

APPLICATION FIELDS

Inorganic rhodium-containing compounds.

NMR REFERENCES

A saturated solution of Rh(acac)₃ in CDCl3 is used as an external reference sample (absolute frequency of 3.186447 MHz with respect to 100.00 MHz of 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 Rh nucleus are:

¹⁰³Rh chemical shifts cover a range of 12000ppm, from +10000ppm to -2000ppm.

Long T₁ values.

NMR EXPERIMENTS

In Rhodium-containing compounds the following experiments can be helpful:

¹H-decoupled vs ¹H-coupled ¹⁰³Rh spectrum.

¹⁰³Rh-decoupled vs ¹⁰³Rh-coupled ¹H spectrum.

1D ¹⁰³Rh-{¹H} INEPT experiments ( 93IC2663-32 ).

2D¹H-¹⁰³Rh HMQC experiment ( 87JORG115 , 88MRC895 , 90ANG548 , 91MRCS38 , 96MRC373 ).

2D³¹P-¹⁰³Rh HETCOR ( 82JMR528-47 ) and HMQC ( 91MRCS118 , 93JACS5889 , 96MRC373 ) experiment.

Intensity gain ¹H-¹⁰³Rh factors:

NOE INEPT Inverse INEPT HMQC

-16.8 31.6 178 5610

BIBLIOGRAPHY

Interesting review: B91PRE143.
The Transition Metals NMR: B79HAR195.
¹⁰³Rh NMR in homo- and heteronuclear clusters ( B96GIE313).
93JACS5889
92IC4155-31
92DALTON233
91MRCS118
91MRCS73
91ORG3049

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NOE	INEPT	Inverse INEPT	HMQC
-16.8	31.6	178	5610