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The Reactivity of Methyl Salicylate with Yttrium Nitrate and Its Application

Author: LinXiaoYun
Tutor: LiYongXiu
School: Nanchang University
Course: Inorganic Chemistry
Keywords: Methyl salicylate Yttrium nitrate Nitrosylation Porous yttria High surface area Explosive decomposition
CLC: O621.25
Type: Master's thesis
Year: 2005
Downloads: 95
Quote: 4
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Abstract


The nitrosated is an important way of nitrogen oxides in many lives metabolic processes in the body, plays an important role in many physiological processes. Therefore, the formation of nitrogen oxides and reactive in biochemistry and supramolecular chemistry has received considerable attention. This paper studies the characteristic reaction of methyl salicylate and yttrium nitrate, and the formation of nitrogen oxides and related nitroso reaction were discussed. The results showed that: methyl salicylate and yttrium nitrate refluxed in ethyl acetate, which can produce special color reaction. The resulting solution and the solid product precipitated is dark green, a wavelength of 330nm and about 660nm, there are two broad absorption band with a nitroso compound monomer to the pi * -pi * < / sup> and n-pi * transition corresponding to prove the existence of the nitrosylation reaction. As Figure Determination green compound molar absorption coefficient epsilon = 6.922 × 10 -1 cm -1 . At the same time, the infrared spectra of the solid complexes also proved the formation of nitroso compounds. The chromogenic reaction there is an induction period, the length of the induction period is shortened with the increase of the concentration of reactants, the reaction temperature, the subsequent reaction velocity with the reactant concentrations and reaction temperature to accelerate the increase. By variable temperature measured activation energy for 177.8KJ · mol -1 ; obtained as a diagram method of the reaction the reaction order for yttrium nitrate and methyl salicylate two reactants, respectively, 2.3 and 1.5, are non-integer, prove that the reaction is not a simple elementary reactions, but there is more than one reaction stage a complex reaction. The results also showed that: The characteristic color reaction occurs mainly in the rare earth nitrate with salicylic acid esters, such compounds containing hydroxyl and carbonyl groups in the adjacent position, respectively, as a proton donor acid and acceptor alkali . Or with the formation of the rare earth ion chelate is the key. The reaction rate decreases linearly with the ester group steric effect, indicating the formation of the ring coordination compounds between rare earth ions and salicylate play an important role in the nitrosylation reaction. Explosive decomposition of yttrium nitrate and methyl salicylate complexes formed by preparing a porous high specific surface area of ??the yttrium oxide powder, with BET, XRD, infrared spectroscopy (IR), scanning electron microscopy (SEM) Characterization of the properties of the powder surface. Experimental results show that calcined at 600 ° C heating available surface area of ??up to 65.37m 2 · g -1 of yttrium oxide powder, the temperature rose from 600 ° C to 900 ° C, than the surface is also reduced to 20.33m 2 · g -1 . Moreover, the oxides exhibit a strong surface activity, and is easy to absorb moisture in the air and carbon dioxide with increasing calcination temperature, which is also a reason falling on the surface of the powder. Calcined at a higher temperature, a further reason may be that the sample surface area and surface activity decreased sintering.

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Organic Chemistry general issues > Properties of organic compounds > Chemical properties of organic reactions
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