Synthesis and Thermodynamic Characteristics of Molybdenum Carboxylates Мо2((СH3)3CCOO)4, Мо2(СF3COO)4, and МоО2((СH3)3CCOO)2

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
D. B. Kayumova, I. P. Malkerova, D. S. Yambulatov, A. A. Sidorov, I. L. Eremenko, A. S. Alikhanyan
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引用次数: 0

Abstract

Dimolybdenum tetratrimethylacetate (tetrapivalate) and tetratrifluoroacetate are synthesized, and their evaporation is studied by the Knudsen effusion method with mass spectral analysis of the gas phase. The standard enthalpies of formation of crystalline and gaseous Мо2(СF3COO)4 are estimated for the first time by the study of dissociative ionization. The solid-phase reactions of silver pivalate (CН3)3СCOOAg with molybdenum are studied by thermography (TG), differential scanning calorimetry (DSC), and mass spectrometry. The reaction in a temperature range of 410–480 K affords molybdenum oxopivalate МоО2Piv2. The obtained experimental data make it possible to estimate the standard enthalpy of formation of this compound: \({{\Delta }_{f}}H_{{298}}^{^\circ }\)(МоО2Рiv2, cr) = –1476 kJ/mol.

Abstract Image

Abstract Image

钼羧酸盐Мо2((СH3)3CCOO)4、Мо2(СF3COO)4 和МоО2((СH3)3CCOO)2 的合成与热力学特性
摘要 合成了三甲基乙酸四钼酸盐(四特戊酸盐)和三氟乙酸四钼酸盐,并通过克努森流出法和气相质谱分析对它们的蒸发进行了研究。通过离解电离研究,首次估算了晶体和气态 Мо2(СF3COO)4 的标准形成焓。通过热成像(TG)、差示扫描量热法(DSC)和质谱法研究了特戊酸银(CН3)3COOAg 与钼的固相反应。在 410-480 K 的温度范围内,反应生成了钼氧代新戊酸酯 МоО2Piv2。根据所获得的实验数据,可以估算出这种化合物的标准形成焓:\({{Delta }_{f}}H_{{298}}^{^\circ }\)(МоО2Рiv2, cr) = -1476 kJ/mol。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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