Polar Molecular Precursors for Alkali and Alkaline Earth Metal Clusters and Low‐Dimensional Polymer Structures: the Solid‐State Structures of [CaI(dme)3]I, and cis‐[SrI2(diglyme)2] (dme = CH3OC2H4OCH3; diglyme = CH3(OC2H4)2OCH3)

Abstract

AbstractTwo new alkaline earth metal halide adducts with oxygen‐donor polyether ligands are described. One of them, cis[SrI2(diglyme)2], features two terminally bonded anions in vicinal positions, and at an angle of ca. 90°. The low bond valence sum of ca. 1.9 indicates how well the cation is shielded by its ligands in the solid state, and that ligand exchange can be expected in solution and upon reaction. The second compound, [CaI(dme)3]I, consists of an ion pair formed by the cationic complex [CaI(dme)3]+ with one anion in terminal position, and one iodide. Both compounds possess a strong dipole moment at the molecular level, but crystallize in centrosymmetric space groups. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)