Organometallic Aluminum Compounds Derived from 2-(1,3,5-Dithiazinan-5-yl)ethanol Ligands

The reactions of AlMe2Y (Y = Me or Cl) with new ligands 2-(1,3,5-dithiazinan-5-yl)ethanol (1), 2-(1,3,5-dithiazinan-5-yl)-1-methylethanol (2), and 2-(1,3,5-dithiazinan-5-yl)-1-phenylethanol (3) are described. The ligands are coordinated to aluminum atoms by nitrogen and oxygen atoms, with a nitrogen based spiranic structure. Equimolar reactions gave dimeric structures bearing pentacoordinated aluminum atoms O-(AlMeY)-2-(1,3,5-dithiazinan-5-yl)ethanolates (4-7) as well as monometallic compounds with tetracoordinated aluminum atoms O-(AlMeY)-2-(1,3,5-dithiazinan-5-yl)ethanolates (8-9). Reactions with 2 equiv of the aluminum reagents afforded tetracoordinated dialuminum complexes O-(AlMeY)-O-(AlMe2Y)-2-(1,3,5-dithiazinan-5-yl)ethanolate (10-18). The structures of the new compounds were determined by NMR (1H,13C, and 27Al) and complemented by X-ray diffraction of compounds 4, 10, and 16-18. Relevant intermolecular interactions C-H···S, C-H···Cl, and C-H···(pi) found in the crystalline network are reported.