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Calorimetric Determination of the Formation Enthalpies of Cs Polymolybdates at 298.15 K and 0.1 MPa
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-07-02 , DOI: 10.1021/acs.jced.0c00210 Pierre Benigni 1 , Georges Mikaelian 1 , Elise Ruiz 1 , Carine Perrin-Pellegrino 1 , Jacques Rogez 1
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-07-02 , DOI: 10.1021/acs.jced.0c00210 Pierre Benigni 1 , Georges Mikaelian 1 , Elise Ruiz 1 , Carine Perrin-Pellegrino 1 , Jacques Rogez 1
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Samples of cesium polymolybdates Cs2MonO3n+1 with n = 2, 3, 5, and 7 have been synthesized by melting and cooling stoichiometric mixtures of commercially available Cs2MoO4 and MoO3 powders. The single-phase character of the samples has been checked by X-ray diffraction. The standard enthalpies of formation of the Cs2MonO3n+1 polymolybdates with n = 1, 2, 3, 5, and 7 have been measured by solution calorimetry in dilute (CsOH·H2O) solvent at 298.15 K under 0.1 MPa. The values found for the mono and dimolybdates, ΔfH° (Cs2MoO4) = −1513.56 ± 1.11 kJ mol–1, ΔfH° (Cs2Mo2O7) = −2301.84 ± 2.37 kJ mol–1, are in good agreement with the already available calorimetric measurements. To our knowledge, this is the first time that the enthalpies of formation of cesium tri, penta, and heptamolybdates are measured: ΔfH° (Cs2Mo3O10) = −3077.17 ± 3.47 kJ mol–1, ΔfH° (Cs2Mo5O16) = −4601.70 ± 5.96 kJ mol–1, and ΔfH° (Cs2Mo7O22) = −6087.16 ± 8.79 kJ mol–1, respectively. The convex shape of the curve constructed from the formation enthalpies of the Cs2MonO3n+1 polymolybdates referred to the Cs2MoO4 and MoO3 oxides is consistent with the Cs2MoO4–MoO3 pseudobinary diagram.
中文翻译：
量热法测定298.15 K和0.1 MPa下Cs聚钼酸盐的形成焓
铯polymolybdates Cs的样品2沫Ñ ø 3 Ñ 1与Ñ = 2，3，5，和图7已经通过熔化和冷却市售Cs的化学计量的混合物合成的2的MoO 4和的MoO 3的粉末。样品的单相特性已通过X射线衍射检查。通过溶液量热法（CsOH·H 2稀溶液）测量了n = 1、2、3、5和7的Cs 2 Mo n O 3 n +1多钼酸盐的形成标准焓。O）于0.1 MPa下于298.15 K的溶剂。单钼酸盐和二钼酸盐的值Δf H °（Cs 2 MoO 4）= −1513.56±1.11 kJ mol –1，Δf H °（Cs 2 Mo 2 O 7）= −2301.84±2.37 kJ mol –1与已有的量热测量非常吻合。据我们所知，这是首次测量三，五碳酸铯和七钼酸铯的形成焓：Δf H °（Cs 2 Mo 3 O 10）= −3077.17±3.47 kJ mol –1，Δfħ °（CS 2沫5 ö 16）= -4601.70±5.96千焦耳摩尔-1，Δ ˚F ħ °（CS 2沫7 ö 22）= -6087.16±8.79千焦耳摩尔-1，分别。从Cs的形成焓构成的曲线的凸形2沫Ñ ø 3 Ñ 1 polymolybdates称为在Cs 2的MoO 4和的MoO 3的氧化物是具有与Cs一致2的MoO 4 -MoO 3伪二元图。
更新日期：2020-08-14
中文翻译：
量热法测定298.15 K和0.1 MPa下Cs聚钼酸盐的形成焓
铯polymolybdates Cs的样品2沫Ñ ø 3 Ñ 1与Ñ = 2，3，5，和图7已经通过熔化和冷却市售Cs的化学计量的混合物合成的2的MoO 4和的MoO 3的粉末。样品的单相特性已通过X射线衍射检查。通过溶液量热法（CsOH·H 2稀溶液）测量了n = 1、2、3、5和7的Cs 2 Mo n O 3 n +1多钼酸盐的形成标准焓。O）于0.1 MPa下于298.15 K的溶剂。单钼酸盐和二钼酸盐的值Δf H °（Cs 2 MoO 4）= −1513.56±1.11 kJ mol –1，Δf H °（Cs 2 Mo 2 O 7）= −2301.84±2.37 kJ mol –1与已有的量热测量非常吻合。据我们所知，这是首次测量三，五碳酸铯和七钼酸铯的形成焓：Δf H °（Cs 2 Mo 3 O 10）= −3077.17±3.47 kJ mol –1，Δfħ °（CS 2沫5 ö 16）= -4601.70±5.96千焦耳摩尔-1，Δ ˚F ħ °（CS 2沫7 ö 22）= -6087.16±8.79千焦耳摩尔-1，分别。从Cs的形成焓构成的曲线的凸形2沫Ñ ø 3 Ñ 1 polymolybdates称为在Cs 2的MoO 4和的MoO 3的氧化物是具有与Cs一致2的MoO 4 -MoO 3伪二元图。
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