Lanthanoid Tetramethylaluminates and Their Paramagnetic NMR Parameters

Nieland A, Mix A, Neumann B, Stammler H-G, Mitzel NW (2014)
European Journal of Inorganic Chemistry 2014(1): 51-57.

Journal Article | Published | English

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Abstract
Tris(tetramethylaluminate)s of the lanthanoids cerium (1), holmium (2), and erbium (3) were synthesized by treating lanthanoid amide complexes of the type [Ln(NMe2)(3)(LiCl)(3)] with an excess amount of AlMe3. These compounds were characterized by single-crystal X-ray diffraction, elemental analysis, and NMR spectroscopy. Paramagnetic NMR spectroscopic studies were undertaken to investigate the influence of the compounds on the solvent chemical shifts. NMR parameters for the H-1, C-13, and Al-27 nuclei of all the reported lanthanoid tris(tetramethylaluminate)s were measured. The reactions of tris(tetramethylaluminate)s of samarium and holmium with an excess amount of tetrahydrofuran led to [LnMe(2)(thf)(5)][AlMe4] {Ln = Ho (4), Sm (5)}. NMR spectroscopic investigations of the paramagnetic holmium and samarium methyl compounds (i.e., 4, 5) as well as the known diamagnetic analogue [YMe2(thf)(5)][AlMe4] revealed methyl group exchange processes in solution.
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Nieland A, Mix A, Neumann B, Stammler H-G, Mitzel NW. Lanthanoid Tetramethylaluminates and Their Paramagnetic NMR Parameters. European Journal of Inorganic Chemistry. 2014;2014(1):51-57.
Nieland, A., Mix, A., Neumann, B., Stammler, H. - G., & Mitzel, N. W. (2014). Lanthanoid Tetramethylaluminates and Their Paramagnetic NMR Parameters. European Journal of Inorganic Chemistry, 2014(1), 51-57.
Nieland, A., Mix, A., Neumann, B., Stammler, H. - G., and Mitzel, N. W. (2014). Lanthanoid Tetramethylaluminates and Their Paramagnetic NMR Parameters. European Journal of Inorganic Chemistry 2014, 51-57.
Nieland, A., et al., 2014. Lanthanoid Tetramethylaluminates and Their Paramagnetic NMR Parameters. European Journal of Inorganic Chemistry, 2014(1), p 51-57.
A. Nieland, et al., “Lanthanoid Tetramethylaluminates and Their Paramagnetic NMR Parameters”, European Journal of Inorganic Chemistry, vol. 2014, 2014, pp. 51-57.
Nieland, A., Mix, A., Neumann, B., Stammler, H.-G., Mitzel, N.W.: Lanthanoid Tetramethylaluminates and Their Paramagnetic NMR Parameters. European Journal of Inorganic Chemistry. 2014, 51-57 (2014).
Nieland, Anja, Mix, Andreas, Neumann, Beate, Stammler, Hans-Georg, and Mitzel, Norbert W. “Lanthanoid Tetramethylaluminates and Their Paramagnetic NMR Parameters”. European Journal of Inorganic Chemistry 2014.1 (2014): 51-57.
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