Abstract
AbstractComplexes [XAl{CH2CR=NNMe2}2] {X = Cl and R = Me or iPr, X = Me and R = Me, and X = N(NMe2)[CR=CH2] and R = Me or iPr} were synthesized by salt metathesis reactions involving lithium salts of hydrazones, Li[CH2CR=NNMe2]. X‐ray crystallographic studies showed that all the complexes contain two chelating hydrazonido ligands bonding to aluminum through the methylene carbon and amine nitrogen(–NMe2). For the complexes in which X = N(NMe2)[CR=CH2] (R = Me or iPr), the N(NMe2)[CR=CH2] ligand represents a linkage isomer in which the hydrazonido ligand bonds through nitrogen rather than through carbon, thereby becoming a hydrazido ligand. In the single crystal containing [Al{CH2CiPr=NNMe2}2{N(NMe2)(CiPr=CH2)}], its isomer [Al{CH2CiPr=NNMe2}3], having two chelating hydrazonido and one monodentate hydrazonido ligands, is present 45 % of the time. In solution, the [Al{CH2CR=NNMe2}2{N(NMe2)(CR=CH2)}] (R = Me or iPr) complexes are in equilibrium with [Al{CH2CR=NNMe2}3]. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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