The crystal structure of the title compound, [Rb(C18H36N2O6)]3RbSn9, consists of deltahedral [Sn9]4- cluster anions, Rb+ cations and cryptand mol-ecules, which partially sequester the cations. Those cations, which are not coordinated by cryptand mol-ecules, are neighboured directly to the [Sn9]4- clusters and inter-connect them to form ∞1[RbSn9]3- chains. These chains extend parallel to [001] and are arranged in a pseudo-hexa-gonal rod packing, separated by the Rb-cryptand complex cations.
Keywords: Zintl anions; cage compounds; crystal structure; isotypism; stannides; tin.