2 TRANSITION-METAL ANTIMONY ETHOXIDES - M(2)SB(4)(OET)(16) - M=NI OR MN

Two new metal alkoxides, nickel antimony ethoxide, Ni2Sb4(OEt)(16), an d manganese antimony ethoxide, Mn2Sb4(OEt)(16), have been investigated by means of single-crystal X-ray diffraction. These two transition-me tal ethoxides are isostructural with Mg2Sb4(OEt)(16). The major struct ural differences between the three compounds result mainly from the di fferent sizes of the nickel, manganese and magnesium ions. The fourfol d coordination around the Sb atoms and the sixfold coordination around the other metal ions, as well as the conformations of the ethoxide gr oups, are similar in all three compounds.