title: [Te8][NbOCl4]2 containing an infinite chain-like {[Te-Te-Te-(Te5)]2+}n polycation.
abstract: The title compound, [Te(8)][NbOCl(4)](2), was obtained as translucent black crystals by reaction of elemental tellurium, niobium(V) chloride and niobium(V) oxychloride in the ionic liquid BMImCl (BMImCl is 1-butyl-3-methylimidazolium chloride). The synthesis was performed in argon-filled glass ampoules. According to X-ray structure analysis based on single crystals, the title compound crystallizes with triclinic lattice symmetry and consists of infinite {[Te(8)](2+)}(n) cations associated with pyramidal [NbOCl(4)](-) anions. The novel catena-octatellurium(2+) cation is composed of Te(5) rings that are linked via Te(3) units [Te-Te = 2.6455 (18)-2.8164 (19) Å]. The composition and purity of [Te(8)][NbOCl(4)](2) were further confirmed by energy-dispersive X-ray diffraction (EDX) analysis.
authors.affiliation: Karlsruhe Institute of Technology, Institute of Inorganic Chemistry, Germany. claus.feldmann@kit.edu
authors.forename: Claus
authors.initials: C
authors.lastname: Feldmann
authors.forename: Dominic
authors.initials: D
authors.lastname: Freudenmann