Secondary coordination of dichlorodioxomolybdenum(VI) to crown ethers

The reactions of MoO2Cl2 with 15-crown-5 and 18-crown-6 produced crystals of [MoO2Cl2(H2O)2] · (15-crown-5) and [MoO2Cl2-(H2O)2] · (H2O)2 · (18-crown-6) due to adventitious water. Further hydrolysis lead to crystals of [(H3O) · (crown)]2[Mo6O19].