3.2.3. Synthesis of [NH4]4[CuMo6O18(HOCH2C(CH2O)3)2]·5.5H2O (**3**)

The synthetic procedure of compound **3** was similar with that of compound **1** except that HOCH2C(CH2OH)3 (0.54 g, 4.00 mmol) was used for substituting CH3C(CH2OH)3. Elemental analysis calcd. (%) for [NH4]4[CuMo6O18(HOCH2C(CH2O)3)2]·5.5H2O (Mw = 1364.68 g mol<sup>−</sup>1): C 8.80%, H 3.32%,N 4.11%, Cu 4.66%, and Mo 42.18%; found C 8.91%, H 3.36%, N 4.18%, Cu 4.70%, and Mo 42.24%.
