The hydronium ion-crown ether antimon(V)ate salts [(H3O)(18-crown-6)][SbCl6], [(H3O)(12-crown-4)2][SbCl6] and [(H3O)(15-crown-5)][SbCl6] have been isolated from the reactions of SbCl5 and the appropriate crown ether in acetonitrile solution. Identification of these salts follows from microanalytical, IR, Vis-UV, H-1 and Sb-121 NMR data. In one case, viz. SbCl5/15-crown-5/MeCN antimon(V)ate salt formation is accompanied by redox formation ((Sb(V) --> Sb(III)) of the neutral complex SbCl3.15-crown-5. Aspects of the possible routes leading to antimon(v)ate salt and/or redox formation are discussed.