Thermochemical investigations of phase formation processes of elements and compounds of group 15 and 16 in ionic liquid based synthesis - Mechanism of dissolution, structure formation and precipitation

在这个项目中，可以为离子液体中反应的物理化学研究以及合成混合物的热稳定性和产品(低温材料)的热力学性质的确定做出重大贡献。希望在含有15和16族元素的体系中进行基本模型体系的系统研究和新材料合成的开发。因此，化学焦点集中在低温合成中元素同素异形体的区分、在均一范围内具有限定组成的第15和16族化合物的定向合成以及铋基层状化合物的制备。此外，还研究了加入IL助熔剂的同原子和异原子聚阳离子化合物的形成，利用反应量热法、光谱和动态扫描量热法(DSC)研究了其溶解、相形成和沉淀的机理。为了理解在室温以上合成的反应途径，我们的研究涉及到离子液体及其助熔剂体系的热行为和热分解产物的反应性。热力学标准数据的确定允许使用CALPHAD方法进行建模，从而能够全面描述各个化学体系的反应路径和相关系。

Within this project, significant contributions can be made for physico-chemical investigation of reactions in ionic liquids as well as for determination of thermal stability of syntheses mixtures and thermodynamic properties of products (low temperature materials). The methodical investigation of basic model systems and the development of new materials syntheses in systems containing elements of groups 15 and 16 is aspired. Thereby, the chemical focus is set on differentiation of element allotropes in low temperature synthesis, the directed synthesis of compounds of groups 15 and 16 with defined composition within the homogeneity range, and preparation of Bismuth-based layer compounds. Additionally, the formation of homoatomic and heteroatomic poly-cationic compounds with incorporation of IL flux components is aimed.Studies on the mechanism of dissolution, phase formation, and precipitation can be realized using reaction calorimetry, spectroscopy, and dynamic scanning calorimetry (DSC). For comprehension of reaction pathways of syntheses above room temperature the thermal behavior and the reactivity of products of thermal decomposition of ionic liquids and their flux systems is to involve in our investigations. The determination of thermodynamic standard data allows modeling using CalPhaD-methods and thus enables a comprehensive thermodynamic description of reaction pathways and phase relations of the respective chemical systems.