Monomeric Magnesium and Calcium Complexes Containing the Bidentate, Dianionic 1,2‐Bis[(2,6‐diisopropylphenyl)imino]acenaphthene Ligand

Abstract

AbstractThe reduction of 1,2‐bis[(2,6‐diisopropylphenyl)imino]acenaphthene (2,6‐iPr2C6H3‐BIAN) with metallic magnesium or calcium in THF affords the monomeric complexes (2,6‐iPr2C6H3‐BIAN)Mg(THF)3 (1) and (2,6‐iPr2C6H3‐BIAN)Ca(THF)4·(THF)1/2 (2). The crystallisation of 1 and 2 from benzene causes the removal of one of the coordinated THF molecules, yielding (2,6‐iPr2C6H3‐BIAN)Mg(THF)2·(C6H6)1/2 (3a) and (2,6‐iPr2C6H3‐BIAN)Ca(THF)3 (4). Repeated recrystallisation of 1 from benzene gives (2,6‐iPr2C6H3‐BIAN)Mg(THF)2·(C6H6)2 (3b). Although the crystals of 3a and 3b differ in colour and in their crystallographic parameters, their molecular dimensions are very similar. Recrystallisation of 1 from pyridine produces (2,6‐iPr2C6H3‐BIAN)Mg(py)3·(py)2 (5). Complexes 1−5 have been characterised by elemental analysis, UV, IR and 1H NMR spectroscopy, as well as by single‐crystal X‐ray diffraction. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)