3.2.5. Synthesis of (NH4)3{CuMo6O18(OH)3[NH3C(CH2O)3]}·6H2O (**5**)

CuCl2·2H2O (0.34 g, 2.00 mmol), (NH4)6Mo7O24·4H2O (2.47 g, 2.00 mmol) and NH2C(CH2OH)3 (0.48 g, 4.00 mmol) were dissolved in 20 mL of deionized water under stirring. The pH of the mixture was adjusted to about 1.5~2.5 by the concentrated HCl, and the resulting solution was heated to 80 ◦C gradually for 2 h. A blue solution was obtained with a hot filtration process, and provided blue crystals in one day. Elemental analysis calcd. (%) for [NH4]3[CuMo6O18(OH)3(NH3C(CH2O)3)2]·6H2O (Mw = 1259.55 g mol<sup>−</sup>1): C 3.81%, H 2.88%, N 4.45%, Cu 5.05%, and Mo 45.70%; found C 3.88%, H 2.95%, N 4.55%, Cu 5.10%, and Mo 45.77%.
