The crystallization of K [ I ~I H ( C H ~C M ~~) ~]from heptane in the presence of silicone grease led to the formation of the title compound, in which one potassium cation is surrounded by a planar ~yclo-(Me~SiO)~ ligand; K+...O distances range from 2.86(3) to 2.99(4) A.We have previously reported the preparation of K+ [InH( CH2CMe3)3-] along with a crystallographic study of the related dinuclear species K+[H{ In(CH2CMe3)3}2-]. * Attempts to crystallize K+[InH(CH2CMe3)3-] from pentane at low temperature produced large, colourless, transparent, rectangular crystals in the mother liquor. When the pentane was removed. the crystals became opaque and shattered. In an attempt to protect the material from solvent loss, the following crystallization procedure was used. A sample of K + [ I I I H ( C H ~C M ~~) ~-] and a small amount of Dow Corning high-vacuum silicone grease (intended to protect any crystals thus grown) were placed in a tube equipped with a Solv-Seal joint. Heptane was added by vacuum distillation. The solid dissolved as the mixture was warmed from -196 "C to room temp. over 2 h. Needle shaped single crystals formed overnight. The crystal used for the X-ray crystallographic study was cut from a larger crystal and mounted in a thin-walled capillary tube. [ N . B. All materials were handled under purified argon or in vacuo. Organoindium hydrides are
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