Issue 29, 2010

Cationic rare-earth-metal methyl complexes: a new preparative access exemplified for Y and Pr

Abstract

A new procedure for the generation of cationic methyl complexes of rare-earth metals has been developed for yttrium and praseodymium as two examples from the rare-earth series. The reactions of the rare-earth-metal tetramethylaluminates [Ln(AlMe4)3] of yttrium and praseodymium with three differently sized crown ethers in thf, namely [12]crown-4, [15]crown-5 and [18]crown-6, respectively, led to the compounds [YMe([12]crown-4)2]2+[AlMe4]2 (1), [PrMe([12]crown-4)2]2+[AlMe4]2 (2), [YMe([15]crown-5)(thf)2]2+[AlMe4]2 (3), [Pr([15]crown-5)2]3+[AlMe4]3 (4), [YMe([18]crown-6)(thf)]2+[AlMe4]2 (5) and [PrMe([18]crown-6)(thf)2]2+ [AlMe4]2 (6). With the exception of 4, all compounds contain molecular di-cations with a Ln-CH3 unit bonded to one (3, 4, 6) or two (1, 2) crown-ether molecules. The compounds were characterised by determination of their crystal structures, by elemental analyses and in the case of the yttrium compounds by variable temperature NMR spectroscopy. The latter gives insights into molecular dynamic processes and methyl group exchange between cations and anions in solution.

Graphical abstract: Cationic rare-earth-metal methyl complexes: a new preparative access exemplified for Y and Pr

Supplementary files

Article information

Article type
Paper
Submitted
02 Feb 2010
Accepted
01 Apr 2010
First published
04 May 2010

Dalton Trans., 2010,39, 6753-6760

Cationic rare-earth-metal methyl complexes: a new preparative access exemplified for Y and Pr

A. Nieland, A. Mix, B. Neumann, H. Stammler and N. W. Mitzel, Dalton Trans., 2010, 39, 6753 DOI: 10.1039/C002252G

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