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Comprehensive thermochemical study of sublimation, melting and vaporization of scandium(III) beta-diketonates
Thermochimica Acta ( IF 3.5 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.tca.2020.178639
Ludmila N. Zelenina , Kseniya V. Zherikova , Tamara P. Chusova , Sergey V. Trubin , Roman A. Bredikhin , Nikolay V. Gelfond , Natalia B. Morozova

Abstract The pressure of saturated and unsaturated vapor over solid and liquid scandium(III) complexes with acetylacetone Sc(acac)3, trifluoroacetylacetone Sc(tfac)3, and hexafluoroacetylacetone Sc(hfac)3 has been measured using a static method with glass membrane-gauge manometers and Knudsen effusion method with mass spectrometric gas phase monitoring. The temperatures and enthalpies of melting were measured for these compounds by differential scanning calorimetry. As a result of this study the thermal stabilities of investigated complexes were established, the temperature dependences of saturated vapor pressure were obtained, the thermodynamic characteristics of processes under study (ΔprH°T, ΔprS°T) were calculated. Thermal properties of these compounds were compared with literature data.

中文翻译:

β-二酮钪 (III) 升华、熔化和蒸发的综合热化学研究

摘要 使用静态方法用玻璃膜测量了固体和液体钪 (III) 与乙酰丙酮 Sc(acac)3、三氟乙酰丙酮 Sc(tfac)3 和六氟乙酰丙酮 Sc(hfac)3 配合物上饱和和不饱和蒸气的压力 -压力计和带质谱气相监测的 Knudsen 渗出法。通过差示扫描量热法测量这些化合物的温度和熔化焓。作为这项研究的结果,确定了所研究配合物的热稳定性,获得了饱和蒸气压的温度依赖性,计算了所研究过程的热力学特性(ΔprH°T,ΔprS°T)。这些化合物的热性能与文献数据进行了比较。
更新日期:2020-07-01
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