A CO32−-containing, dimanganese-substituted silicotungstate trimer, K9[H14{SiW10MnIIMnIIIO38}3(CO3)]·39H2O

An unprecedented silicotungstate trimer K9[H14{SiW10MnIIMnIIIO38}3(CO3)]·39H2O (1) has been successfully synthesized, in which the CO32− resides inside the three Keggin {SiW10MnIIMnIIIO38} units and the three O atoms serve as μ2-O atoms to connect with three MnIII. Magnetic investigation indicates that 1 exhibits antiferromagnetic coupling.