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ϵ‐RbCuCl 3 , a new polymorph of rubidium copper trichloride: synthesis, structure and structural complexity
Author(s) -
Kornyakov Ilya V.,
Krivovichev Sergey V.,
Gurzhiy Vladislav V.,
Leoni Matteo
Publication year - 2018
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229618004539
Subject(s) - orthorhombic crystal system , octahedron , crystallography , rubidium , copper , crystal structure , ion , chemistry , materials science , potassium , organic chemistry
A novel polymorph of RbCuCl 3 (rubidium copper trichloride), denoted ϵ‐RbCuCl 3 , has been prepared by chemical vapour transport (CVT) from a mixture of CuO, CuCl 2 , SeO 2 and RbCl. The new polymorph crystallizes in the orthorhombic space group C 222 1 . The crystal structure is based on an octahedral framework of the 4 H perovskite type. The Rb + and Cl − ions form a four‐layer closest‐packing array with an ABCB sequence. The Cu 2+ cations reside in octahedral cavities with a typical [4 + 2]‐Jahn–Teller‐distorted coordination, forming four short and two long Cu—Cl bonds. ϵ‐RbCuCl 3 is the most structurally complex and most dense among all currently known RbCuCl 3 polymorphs, which allows us to suggest that it is a high‐pressure phase, which is unstable under ambient conditions.