SOME 2-SUBSTITUTED ETHOXIDES OF MAGNESIUM

A linear polymeric structure has been revealed for the alkoxide Mg(OCH 2CH2OMe)2 formed by bridging alkoxides, with additional bonding from c helation of the ether group to give a coordination number of six. In M g(OCH2CH2NMe2)2 and Mg(OCH2CH2NH2)2 a similar polymeric structure has distortions about the metal, presumably due to stronger electron donat ion by the amine groups. The infra-red spectra of some dioxane adducts of MgX2 (where X = Cl, Br, I) have been recorded. They show the prese nce of a two-dimensional polymer: halogen bridges form linear chains t hat are cross-linked by dioxane units in the chair configuration.