2016. 57, 5 – UDC 541.65(66):546.75:546.21 SONOCHEMICAL AND SOLVOTHERMAL SYNTHESIS OF METHANOL {2-[(2-HYDROXY-1,1-DIMETHYL-ETHYLIMINO)-METHYL]PHENOLATO}DIOXIDOMOLYBDENUM(VI) COMPLEX AND ITS DECOMPOSITION TO MoO3 NANOPARTICLES S. Saeednia1, P. Iranmanesh2, M. Hatefi Ardakani1, N. Ebadinejad1 1Department of Chemistry, Faculty of Science, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran E-mail: sami_saeednia@yahoo.com, s.saeednia@vru.ac.ir 2Department of Physics, Faculty of Science, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran Received April, 8, 2015 Revised — October, 16, 2015 As a new precursor to prepare nano molybdenum trioxide, methanol {2-[(2-hydroxy-1, 1-dimethyl-ethylimino)-methyl]phenolato}dioxidomolybdenum(VI) complex (1) with the Schiff base ligand (H2L) is synthesized by two different methods: solvothermal and sonochemical. <...> Nanoparticles of 1 are obtained by one-pot solvothermal treatment of methanolic solutions of the ligand and di-oxomolybdenyl acetylacetonate at 150 C for 24 h and for improving the quality of nanostructures by sonochemical method with two types of solvents, different concentrations of initial reagents and also different sonication times. <...> The thermal stability of nanosized compound 1 is studied by thermal gravimetric (TG) analysis and differential scanning calorimetry (DSC). <...> Nanoparticles of orthorhombic h-MoO3 are obtained by calcination of nanostructures of compound 1 at 700 C. All compounds and the obtained molybdenum trioxide nanostructures are characterized by elemental analysis, FT-IR, UV-Vis spectroscopy, X-ray powder diffraction (XRD), and scanning electron microscopy (SEM). <...> An exceptional feature of molybdenum is that it has versatile oxidation states, from –2 to 6, and coordination numbers ranging from 4 to 8 [ 4 ]. <...> Schiff bases derived from salicylaldehyde and amino alcohols have been widely used to prepare dioxo molybdenum complexes containing the 2 Mo 2O core [ 7, 8 ]. <...> Sonochemistry is one of the research area in which molecules undergo a chemical reaction due to the application of powerful ultrasound irradiation and many kinds of nanomaterials and nano coordination compounds have been prepared by this method in recent years [13—19 ]. © Saeednia S., Iranmanesh P., Hatefi Ardakani M., Ebadinejad N., 2016 . 1026 – 1034 . 2016. . 57, 5 1027 The investigations on the microstructure of crystalline materials <...>