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

IF 1.1 3区化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR

Russian Journal of Coordination Chemistry Pub Date : 2024-05-08 DOI:10.1134/S1070328423600924

D. B. Kayumova, I. P. Malkerova, D. S. Yambulatov, A. A. Sidorov, I. L. Eremenko, A. S. Alikhanyan

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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.

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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

Russian Journal of Coordination Chemistry 化学-无机化学与核化学

CiteScore

2.40

自引率

15.80%

发文量

审稿时长

7.2 months

期刊介绍： Russian Journal of Coordination Chemistry is a journal that publishes reviews, original papers, and short communications on all aspects of theoretical and experimental coordination chemistry. Modern coordination chemistry is an interdisciplinary science that makes a bridge between inorganic, organic, physical, analytical, and biological chemistry.