Issue 9, 2003

Synthesis and structural characterisation of divalent transition metal complexes containing an unsymmetrical benzamidinate ligand

Abstract

The unsymmetrical benzamidinate ligand [PhC(NSiMe3)(NAr)] (Ar = 2,6-Me2C6H3), denoted L, and its lithium derivative [LiL(TMEDA)] (1) (TMEDA = N,N,N′,N′-tetramethylethylenediamine) have been prepared. Treatment of 1 with MCl2 (M = Mn, Co, Fe or Ni) afforded the corresponding divalent transition metal benzamidinates with interesting molecular structures. The reaction of two equivalents of 1 with MnCl2 or CoCl2 afforded the centrosymmetric binuclear complexes [(ML2)2·(TMEDA)] (M = Mn 2, Co 5). On the other hand, the reaction of FeCl2 with 1, in an appropriate stoichiometric ratio, led to the mononuclear mono(benzamidinate) [FeL(Cl)(TMEDA)] (3) and the bis(benzamidinate) [FeL2(TMEDA)] (4) complexes. The addition of two equivalents of 1 to NiCl2 yielded the mononuclear [NiL2] (6). X-Ray crystallography revealed that the κ2-benzamidinate ligand L is bonded to the metal centre of these complexes in an unsymmetrical fashion. The TMEDA ligand in 25 exhibits different coordination modes. It acts as a chelating ligand in 3, as a monodentate ligand in 4, and as an unusual N,N′-bridging ligand in 2 and 5.

Graphical abstract: Synthesis and structural characterisation of divalent transition metal complexes containing an unsymmetrical benzamidinate ligand

Supplementary files

Article information

Article type
Paper
Submitted
28 Mar 2003
Accepted
28 Apr 2003
First published
21 Jul 2003

New J. Chem., 2003,27, 1310-1318

Synthesis and structural characterisation of divalent transition metal complexes containing an unsymmetrical benzamidinate ligand

H. Kay Lee, T. Suet Lam, C. Lam, H. Li and S. Man Fung, New J. Chem., 2003, 27, 1310 DOI: 10.1039/B303527A

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