Issue 8, 2006

Synthesis and structural characterization of scandium SALEN complexes

Abstract

A series of heteroleptic scandium SALEN complexes, [(SALEN)Sc(µ-Cl)]2 and (SALEN)Sc[N(SiHMe2)2] is obtained via amine elimination reactions using [Sc(NiPr2)2(µ-Cl)(THF)]2 and Sc[N(SiHMe2)2]3(THF) as metal precursors, respectively. H2SALEN ligand precursors comprising H2Salen [(1,2-ethandiyl)bis(nitrilomethylidyne)bis(2,4-di-tert-butyl)phenol], H2Salpren [(2,2-dimethylpropanediyl)bis(nitrilomethylidyne)bis(2,4-di-tert-butyl)phenol], H2Salcyc [(1R,2R)-(−)-1,2-cyclohexanediyl)bis(nitrilomethylidyne)bis(2,4-di-tert-butyl)phenol] and H2Salphen [((1S,2S)-(−)-1,2-diphenylethandiyl)bis(nitrilomethylidyne)bis(2,4-di-tert-butyl)phenol] are selected according to solubility and ligand backbone variation (“[double bond, length as m-dash]N–(R)–N[double bond, length as m-dash]” bite angle) criteria. Consideration is given to the feasibility of [Cl → NR2] and [N(SiHMe2)2 → OSiR3] secondary ligand exchange reactions. X-ray crystal structure analyses of donor-free (Salpren)Sc(NiPr2), (R,R)-(Salcyc)Sc[N(SiHMe2)2], (Salen)Sc(OSitBuPh2) and (Salphen)Sc(OSiHtBu2) reveal (i) a very short Sc–N bond distance of 2.000(3) Å, (ii) weak β(Si–H)amido–Sc agostic interactions and (iii) an exclusive intramolecularly tetradentate and intrinsically bent coordination mode of the SALEN ligands with ∠(Ph,Ph) dihedral angles and Sc–[N2O2] distances in the 124.27(9)–127.7(3)° and 0.638(1)–0.688(1) Å range, respectively.

Graphical abstract: Synthesis and structural characterization of scandium SALEN complexes

Supplementary files

Article information

Article type
Paper
Submitted
20 Sep 2005
Accepted
09 Nov 2005
First published
14 Dec 2005

Dalton Trans., 2006, 1041-1050

Synthesis and structural characterization of scandium SALEN complexes

C. Meermann, P. Sirsch, K. W. Törnroos and R. Anwander, Dalton Trans., 2006, 1041 DOI: 10.1039/B513370J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements