Abstract

Comparative analysis have shown that the thermolysis of complex salt [Pt(NH₃)₄]CrO₄ in synthetic air atmosphere under in situ and ex situ conditions proceeds in different routes. In contrast to in situ experiment, ex situ decomposition leads to formation of intermediate PtCrO₂ phase with delafossite structure. Final decomposition product is a homogeneous mixture of platinum metal and chromium(III) oxide. Complex [Pt(NH₃)₄]CrO₄ has been shown to have negative volumetric coefficient of thermal expansion in the temperature range 30–200°C (–1.9 × 10^–5 1/K). Ex situ experiments have shown stability of the complex on consecutive cyclic heating to 200°C and cooling to ambient temperature

中文翻译：

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四甲基铂（II）铬酸盐热解的原位和异位研究

摘要

对比分析表明，复合盐[Pt（NH ₃）₄ ] CrO ₄在合成空气气氛中在原位和异位条件下的热分解以不同的途径进行。与原位实验相反，异位分解导致形成具有铜铁矿结构的中间PtCrO ₂相。最终的分解产物是铂金属和氧化铬（III）的均匀混合物。复合物[Pt（NH ₃）₄ ] CrO ₄在30–200°C（–1.9×10 ^–5）的温度范围内具有负的体积热膨胀系数。1 / K）。异位实验表明该配合物在连续循环加热至200°C并冷却至环境温度时具有稳定性