[Te-8](2)[Ta4O4Cl16]: A Two-dimensional Tellurium Polycation obtained via Ionic Liquid-Based Synthesis

作者：Freudenmann Dominic; Feldmann Claus^*

来源：Zeitschrift fur Anorganische und Allgemeine Chemie, 2011, 637(11): 1481-1485.

DOI：10.1002/zaac.201100143

• Polycations
• Tellurium
• Ionic liquids
• Oxidochloridotantalate
• Crystal structure

By reaction of elemental tellurium, tellurium(IV) chloride, tantalum(V) chloride and tantalum(V) oxychloride in the ionic liquid [BMIM]Cl ([BMIM]Cl:1-Butyl-3-methylimidazolium chloride), [Te-8](2)[Ta4O4Cl16] is obtained in the form of lucent black crystals. The title compound consists of infinite [Te-Te-(Te-6)](n)(2+) chains (Te-Te: 264.9(1)-284.3(1) pm) and isolated [Ta4O4Cl16](4-) anions. The [Te-Te(Te-6)](n)(2+) chains are interconnected to form a two-dimensional tellurium network (Te-Te: 335.9 pm). Due to this interaction the [Te-Te-(Te-6)](n)(2+) chains in [Te-8](2)[Ta4O4Cl16] show an arrangement that differs significantly from known polycationic [Te-8](n)(2+) chains. The two-dimensional tellurium network is finally separated by tetrameric, corner-sharing oxidochloridotantalate anions [(TaO2/2Cl4/1)(4)](4-) that are firstly observed. The composition of [Te-8](2)[Ta4O4Cl16] is confirmed by EDX analysis; its optical band gap is estimated to 1.1-1.2 eV via UV/Vis spectroscopy.

• 出版日期2011-9