Grasser Matthias A, Pietsch Tobias, Blasius Jan, Hollóczki Oldamur, Brunner Eike, Doert Thomas, Ruck Michael
Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany.
Mulliken Center for Theoretical Chemistry, Institute for Physical and Theoretical Chemistry, University of Bonn, Beringstr. 4+6, 53115, Bonn, Germany.
Chemistry. 2022 Feb 1;28(7):e202103770. doi: 10.1002/chem.202103770. Epub 2021 Dec 28.
Elemental tellurium readily dissolves in ionic liquids (ILs) based on tetraalkylphosphonium cations even at temperatures below 100 °C. In the case of ILs with acetate, decanoate, or dicyanamide anions, dark red to purple colored solutions form. A study combining NMR, UV-Vis and Raman spectroscopy revealed the formation of tellurium anions (Te ) with chain lengths up to at least n=5, which are in dynamic equilibrium with each other. Since external influences could be excluded and no evidence of an ionic liquid reaction was found, disproportionation of the tellurium is the only possible dissolution mechanism. Although the spectroscopic detection of tellurium cations in these solutions is difficult, the coexistence of tellurium cations, such as (Te ) and (Te ) , and tellurium anions could be proven by cyclic voltammetry and electrodeposition experiments. DFT calculations indicate that electrostatic interactions with the ions of the ILs are sufficient to stabilize both types of tellurium ions in solution.
元素碲即使在低于100°C的温度下也能很容易地溶解在基于四烷基鏻阳离子的离子液体（ILs）中。对于含有乙酸根、癸酸根或双氰胺根阴离子的离子液体，会形成深红色至紫色的溶液。一项结合核磁共振、紫外可见光谱和拉曼光谱的研究表明，形成了链长至少达到n = 5的碲阴离子（Te ），它们相互之间处于动态平衡。由于可以排除外部影响且未发现离子液体反应的证据，碲的歧化是唯一可能的溶解机制。尽管在这些溶液中很难通过光谱检测到碲阳离子，但通过循环伏安法和电沉积实验可以证明碲阳离子（如(Te ) 和(Te ) ）与碲阴离子共存。密度泛函理论计算表明，与离子液体离子的静电相互作用足以使两种类型的碲离子在溶液中稳定存在。
