The co-ordination chemistry of β-diimines has been found to be markedly different from otherwise identical α-diimines, it being significantly more difficult to prepare stable complexes of a variety of transition metal species. Where such species were preparable, the ligands were found to be incapable of stabilising metal-alkyl bonds, in marked contrast to their α-diimine counterparts. These differences are ascribed to a combination of steric, entropic and electronic factors. Crystal structures of 2-Pri-C6H4NCMeCMe2C-MeN-2- Pri-C6H4, 2,6-Pr2i-C6H3NCMeCMeN-2- Pri-C6H4, [2-Pri-C6H4NCMeCMe2CMeN-2- Pri-C6H4PdCl2] and [2,6-Pr2i-C6H3NCMeCMeN-2, 6-Pri-C6H3PdCl2] are reported. A partial structure of [2,6-Pr2i-C6H3NCMe CMe2CMeN-2,6-Pri-C6H3 Pd2Cl4] is also briefly discussed. © 2003 Elsevier Science Ltd. All rights reserved.
- Chelate complexes