HYDROTHERMAL VERSUS NON-HYDROTHERMAL FOR THE SYNTHESIS OF THE MOLYBDOARSENATE ANION [MO4O8(HAS3O7)(2)](4-) - CRYSTAL-STRUCTURE OF [H3N(CH2)(3)NH3](2)[MO4O8(HAS3O7)(2)].2H(2)O

Hydrothermal technique was developed together with a room temperature process for the synthesis of the reduced cluster [Mo4O8(HAs3O7)(2)](4- ). The formation of this anion is favored in aqueous medium and does n ot require high temperature, The 1,3-diaminopropane salt of this molec ular anion was isolated and its structure determined by single crystal X-ray diffraction. The compound crystallizes in the monoclinic system P2(1)/n (No. 14) with a = 12.412(1) Angstrom, b = 9.175(1) Angstrom, c = 13.819(2) Angstrom and beta = 103.11(1)degrees, V = 1532.7(6) Angs trom(3), Z = 4. The structure determination was solved with 2594 uniqu e reflections (I greater than or equal to 2 sigma(I)) up to R1 = 0.036 and wR2 = 0.081.