Issue 29, 2011

Synthesis and molecular structure of piperazidine-bridged bis(phenolate) samarium(ii) complex and its reactivity to carbodiimides

Abstract

The reaction of Sm[N(TMS)2]2(THF)2 with H2L (L = 1,4-bis(2-hydroxy-3-tert-butyl-5-methyl-benzyl)-piperazidine) afforded [SmL(HMPA)2]4·8THF 2 upon treatment with 2 equivalents of HMPA (hexamethyl phosphoric triamide). X-ray crystallographic analysis of 2 reveals a tetrametallic macrocyclic structure, which represents the first example of a crystal structure of a Sm(II) complex stabilized by heteroatom bridged bis(phenolate) ligands. Reduction of carbodiimides RNCNR (R = iPr and Cy) by [SmL]2(THF) 1, which was formed in situ by the reaction of Sm[N(TMS)2]2(THF)2 with H2L in THF, yielded the Sm(III) complex with an oxalamidinate ligand [LSm{(NiPr)2CC(NiPr)2}SmL]·THF 3 for iPrNCNiPr and the Sm(III) complex with a diamidocarbene ligand [LSm(μ-CyNCNCy)SmL]·5.5THF 4 for CyNCNCy.

Graphical abstract: Synthesis and molecular structure of piperazidine-bridged bis(phenolate) samarium(ii) complex and its reactivity to carbodiimides

Supplementary files

Article information

Article type
Paper
Submitted
17 Jan 2011
Accepted
16 May 2011
First published
24 Jun 2011

Dalton Trans., 2011,40, 7639-7644

Synthesis and molecular structure of piperazidine-bridged bis(phenolate) samarium(II) complex and its reactivity to carbodiimides

Z. Du, Y. Zhang, Y. Yao and Q. Shen, Dalton Trans., 2011, 40, 7639 DOI: 10.1039/C1DT10081E

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