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Issue 25, 2014
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Synthesis and structural characterization of amido scorpionate rare earth metals complexes

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Abstract

The reactivity of hybrid scorpionate/cyclopentadienyl ligands in the form of the protio derivatives as a mixture of two regioisomers, namely bpzcpH [1-{2,2-bis(3,5-dimethylpyrazol-1-yl)-1,1-diphenylethyl}-1,3-cyclopentadiene and 2-{2,2-bis(3,5-dimethylpyrazol-1-yl)-1,1-diphenylethyl}-1,3-cyclopentadiene] and bpztcpH [1-{2,2-bis(3,5-dimethylpyrazol-1-yl)-1-tert-butylethyl}-1,3-cyclopentadiene and 2-{2,2-bis(3,5-dimethylpyrazol-1-yl)-1-tert-butylethyl}-1,3-cyclopentadiene], with the tris(silylamide) precursors [M{N(SiHMe2)2}3(thf)x] of rare earth metals (including the group 3 metals scandium and yttrium) is related to the atomic radii of the metal centres. The reaction with the precursor containing the smallest ion, [Sc{N(SiHMe2)2}3(thf)], did not proceed even heating at reflux temperature in toluene. The reaction with the precursors that contain a medium-sized metal ion, i.e., [M{N(SiHMe2)2}3(thf)2] (M = Y, Lu), proceeded only at high temperature and gave good yields of the silylenediamide-containing derivatives [M{κ2-NN-Me2Si(NSiHMe2)2}(bpzcp)] (M = Y 1, Lu 2) and [M{κ2-NN-Me2Si(NSiHMe2)2}(bpztcp)] (M = Y 3, Lu 4) by an double activation of Si–H and Si–N bonds. However, the reaction with the precursors that contained the largest metal ions, i.e., [M{N(SiHMe2)2}3(thf)2] (M = Nd, Sm), proceeded rapidly at room temperature to afford the bis(silylamide) complexes [M{N(SiHMe2)2}2(bpzcp)] (M = Nd 5, Sm 6) and [M{N(SiHMe2)2}2(bpztcp)] (M = Nd 7, Sm 8). Additionally, the alkyl heteroscorpionate yttrium and lutetium complexes [M(CH2SiMe3)2(NNCp)] (M = Y, Lu) reacted with an excess of HN(SiHMe2)2 to give the mixed alkyl/amide derivatives [M{N(SiHMe2)2}(CH2SiMe3)(bpzcp)] (M = Y 9, Lu 10) and [M{N(SiHMe2)2}(CH2SiMe3)(bpztcp)] (M = Y 11, Lu 12). The structures of the complexes were determined by spectroscopic methods and the X-ray crystal structures of 1, 3 and 5 were also established.

Graphical abstract: Synthesis and structural characterization of amido scorpionate rare earth metals complexes

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Publication details

The article was received on 14 Mar 2014, accepted on 02 May 2014 and first published on 06 May 2014


Article type: Paper
DOI: 10.1039/C4DT00770K
Citation: Dalton Trans., 2014,43, 9586-9595
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    Synthesis and structural characterization of amido scorpionate rare earth metals complexes

    I. Márquez-Segovia, A. Lara-Sánchez, A. Otero, J. Fernández-Baeza, J. A. Castro-Osma, L. F. Sánchez-Barba and A. M. Rodríguez, Dalton Trans., 2014, 43, 9586
    DOI: 10.1039/C4DT00770K

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