3.2.8. Synthesis of Na4(H2O)14{CuMo6O18[CH3C(CH2O)3]2}·2H2O (**8**)

CuCl2·2H2O (0.34 g, 2.00 mmol), Na4Mo8O26 (1.92 g, 1.50 mmol) and CH3C(CH2OH)3 (0.48 g, 4.00 mmol) were dissolved in 20 mL of deionized water under stirring. Concentrated HCl was used to adjust the pH of the mixture to 5, and then the resulting solution was heated to 80 ◦C for 2 h. A blue solution was obtained using a hot filtration process, and generated blue crystals in several days. Elemental analysis calcd. (%) for Na4(H2O)14{CuMo6O18[CH3C(CH2O)3]2}·2H2O (Mw = 1541.64 g mol<sup>−</sup>1): C 7.79%, H 3.27%, Na 5.97%, Cu 4.12%, and Mo 37.34%; found C 7.84%, H 3.35%, Na 6.05%, Cu 4.06%, and Mo 37.18%.
