ChemInform Abstract: Crystal Structures of Compounds A2TeX6 (A: K, NH4, Rb, Cs; X: Cl, Br, I).

Abstract

The first determination of the crystal structure of (NH4)2TeI6 completes the list of descriptions of A2TeX6 structures and thus renders possible a discussion of this entire group of compounds.

Organic–Inorganic Perovskites: Structural Versatility for Functional Materials Design

“…(H 2 3-AMP) 2 PbBr 6 provides an example of the most common q = 1 member of the ⟨111⟩-oriented perovskites, which belong to the cubic K 2 PtCl 6 -type structure with a great many known members. The K 2 PtCl 6 -type structure is adopted, for example, by Cs 2 SnI 6 , which has recently been used as a hole conductor in a solar cell device, 90 and A 2 TeX 6 (A = NH 4 + , K + , Rb + , Cs + , Tl + ; X = Cl − , Br − , I − ), 91,92 featuring Te 4+ , which is isoelectronic to for example Sn 2+ and Pb 2+ . Since the extended inorganic framework is absent in this structure, no clear organic cation size restrictions can be outlined for q = 1 members, and the structure should, in principle, be able to accept a wide range of components as long as the charge balance is preserved.…”