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 [Ta 4 O 4 Cl 16 ] 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 [Ta 4 O 4 Cl 16 ] 4anions. 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-* Prof. Dr. C. Feldmann