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Asadi, Mozaffar,Ghatee, Mohammad Hadi,Torabi, Susan,Mohammadi, Khosro,Moosavi, Fatemeh Korean Chemical Society 2013 대한화학회지 Vol.57 No.1
Some vanadyl complexes were synthesized by treating a methanolic solution of the appropriate Schiff base ligand and one equivalent of $VO(SO_4)_2$ to yield [($VOL_2^{1-14}$)](L=Salicylaldehyde's derivatives, Schemes 1, 2). These oxovanadium (IV) complexes were characterized based on their FT-IR, UV-Vis spectroscopy and elemental analysis. The IR spectra suggest that coordination takes place through azomethine nitrogen and phenolate oxygen. In addition, the formation constants of the oxovanadium (IV) binary complexes were determined in methanolic medium. The ab initio calculations were also carried out to determine the structural and the geometrical properties of one of the complexes and its calculated vibrational frequencies were investigated.
Zahra Asadi,Mozaffar Asadi,Fahimeh Dehghani Firuzabadi,Mohammad Ranjkesh Shorkaei 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
This study presents a new method in synthesis of nano uranyl Schiff base complexes. In thismethod slowaddition of dilute uranyl(VI) acetate solution to dilute Schiff base solution following the reflux for about24 h, yields nano uranyl(VI) Schiff base complexes. Characterization of Schiff base ligands and nanouranyl complexes has been done using 1H NMR, IR, UV–vis spectroscopy, elemental analysis. Schiff baseligands were synthesized by the condensation of one mole 3,4-diaminobenzophenone and two molessalicylaldehyde or substituted salicylaldehyde (3-OMe, 4-OMe, 5-OMe, 5-Br, 5-Cl). The electrochemicalproperties of the uranyl(IV) complexes were investigated by cyclic voltammetry. A good correlation wasobserved between the oxidation potentials and the electron withdrawing character of the substituentson the Schiff base ligands, according to the following trend: 5-MeO < H < 5-Br 5-Cl. Also the effect ofthe position of the substituted groups of Schiff base on the anodic potentials is as follows: 5-OMe < 3-OMe < 4-OMe.
Shahram G. Pakdehi,Abdolhamid Asadi,Mozaffar Salimi 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.6
Ni/γ-Al2O3 nanocatalyst was synthesized by incipient wetness impregnation method for using in the catalytic decomposition ofhydrazine. To stabilize the catalyst, γ-Al2O3 support was precalcined which resulting 8% reduction in specific surface area. Thecatalyst was characterized by XRD, BET and TEM. The results showed that increasing the number of impregnation steps ledto a reduction in size of nickel particles. In addition, the number of impregnation steps had a direct effect on strength ofcatalyst and could reduce the catalyst loss. TPR analysis showed that Ni/γ-Al2O3 nanocatalyst was reduced at about 700 oC.