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    (La) Lanthanum NMR 138Lanthanum NMR Properties of 138La 139Lanthanum NMR Properties of 139La Safety note References
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  • Properties of 138La
  • 139Lanthanum NMR
  • Properties of 139La
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(La) Lanthanum NMR

Use our NMR service that provides La NMR and many other NMR techniques.

Lanthanum (La) has two quadrupolar NMR active nuclei 138La and 139La (fig. 1). They yield broad signals in symmetric environments and very broad signals in small complexes. The signals from larger complexes are too broad to be observed with a high-resolution NMR spectrometer. 139La is medium sensitivity nucleus and much more sensitive than the very low sensitivity 138La. 138La also yields broader signals. Therefore 139La is the lanthanum nucleus of choice. Lanthanum has a very wide chemical shift range. Lanthanum NMR is used for studying small lanthanum complexes and its relaxation rate is used in studies of binding.

Fig. 1. Comparison of 138La and 139La NMR for LaCl3 (0.01 M) in D2O. The experimental conditions were different for each nucleus so the 139La signal should be about 1000 times more sensitive than it appears as compared with the 138La signal.

Lanthanum spectrum

Each type of lanthanum has its characteristic chemical shift range (fig. 2).

Fig. 2. Chemical shift ranges for lanthanum NMR

Chemical shifts of lanthanum

138Lanthanum NMR

138La (fig. 3) yields signals that are broader and much less sensitive and than 139La. Therefore 138La is not the lanthanum nucleus of choice for NMR.

Fig. 3. 138La NMR spectrum of LaCl3 (0.01 M) in D2O

138La spectrum

Properties of 138La

(Click here for explanation)

PropertyValue
Spin5
Natural abundance0.090%
Chemical shift range2200 ppm, from -600 to 1600
Frequency ratio (Ξ)13.194300%
Reference compound0.01 M LaCl3 in D2O
Linewidth of reference700 Hz
T1 of reference0.001 s
Receptivity rel. to 1H at natural abundance8.46 × 10-5
Receptivity rel. to 1H when enriched0.0940
Receptivity rel. to 13C at natural abundance0.497
Receptivity rel. to 13C when enriched552
Linewidth parameter120 fm4

139Lanthanum NMR

139La (fig. 4) yields signals that are less broad and much more sensitive and than 138La. Therefore 139La is the lanthanum nucleus of choice for NMR.

Fig. 4. 139La NMR spectrum of LaCl3 (0.01 M) in D2O

139La spectrum

Properties of 139La

(Click here for explanation)

PropertyValue
Spin7/2
Natural abundance99.91%
Chemical shift range2200 ppm, from -600 to 1600
Frequency ratio (Ξ)14.125641%
Reference compound0.01 M LaCl3 in D2O
Linewidth of reference142 Hz
T1 of reference0.0023 s
Receptivity rel. to 1H at natural abundance0.0605
Receptivity rel. to 1H when enriched0.0606
Receptivity rel. to 13C at natural abundance356
Receptivity rel. to 13C when enriched356
Linewidth parameter54 fm4

Safety note

Some of the materials mentioned here are very dangerous. Ask a qualified chemist for advice before handling them. Qualified chemists should check the relevant safety literature before handling or giving advice about unfamiliar substances. NMR solvents are toxic and most are flammable. Specifically, lanthanum salts may be toxic besides toxicity arising from the anion: wear protective gloves.

References

  • O. Lutz, and H. Oehler, "Lanthanum-138 and lanthanum-139 nuclear magnetic resonance studies", J. Magn. Reson., 37, 261-267 (1980).
  • V. P. Tarasov, G. A. Kirakosyan, Y. A. Buslaev, S. V. Trots, and V. T. Panyushkin, "Lanthanum-139 NMR study of aqueous dimethylformamide solutions", Koordinat. Khim., 11, 913-917 (1985).
  • S. H. Eggers, and R. D. Fischer, "Preparation and lanthanum-139 NMR characterization of tris(cyclopentadienyl)bis(cyclohexyl isonitrile) lanthanum (III)", J. Organometal. Chem., 315, C61-C63 (1986).
  • M. Adam, E. T. K. Haupt, and R. D. Fischer, "Lanthanum-139 NMR spectroscopy of organolanthanum(III) complexes. Part IV. Lanthanum-139 NMR : investigations on organolanthanum compounds", Bull. Magn. Reson., 12, 101-103 (1990).
  • A. F. Savost'yanova, V. V. Trachevskii, and V. S. Kuts, "Magnetic resonance characteristics of lanthanum dithiocarbamates" Koordinat. Khim., 17, 417-421 (1991).
  • H. Windisch, J. Scholz, R. Taube and B. Wrackmeyer, "139La-NMR-spectroscopy of allyl lanthanum (III) complexes", J. Organometal. Chem., 520, 23-30 (1996).
  • Y. Israeli, and C. Detellier, "Multinuclear magnetic resonance study of the complexation of lanthanum (III) by D-glucitol and ribitol in aqueous solution", Carbohyd. Res., 297, 201-207 (1997).
  • T. Yaita, D. Ito and S. Tachimori, "139La NMR relaxation and chemical shift studies in aqueous nitrate and chloride solutions", J. Phys. Chem. B, 102, 3886-3891 (1998).