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Reaction of Cs 2 CO 3  and As 2 Te 3  in methanol at 145°C affords the telluridoarsenate(II) Cs 4 As 2 Te 6 . A trans conformation is observed for the centrosymmetric As 2 Te 4−  6  anions, which consist of two ѱ-tetrahedralo As(As)(Te 2 )Te units with a common As-As bond. The terminal As-Te distance of 2.554(2) Å is much shorter than the As-Te distance of 2.691(2) Å to the Te 2  unit, which exhibits a Te-Te bond length of 2.744(2) Å. Both of the independent cations are coordinated in an irregular manner by eight Te atoms.

zeitschrift für naturforschung b

Methanolothermale Synthese von Cs 4 As 2 Te 6 , des ersten Alkalimetall- Telluridoarsenats mit As-As- und Te-Te-Bindungen / Methanolothermal Synthesis of Cs 4 As*  Te 6 , the First Alkali Metal Telluridoarsenate with As-As and Te-Te Bonds