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The First High‐Pressure Chromium Oxonitridoborate CrB 4 O 6 N—an Unexpected Link to Nitridosilicate Chemistry
Author(s) -
Fuchs Birgit,
Johrendt Dirk,
Bayarjargal Lkhamsuren,
Huppertz Hubert
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202110582
Subject(s) - tetrahedron , chromium , crystallography , chemistry , high pressure , trigonal crystal system , link (geometry) , ion , lattice (music) , atom (system on chip) , nitrogen atom , crystal structure , group (periodic table) , physics , combinatorics , thermodynamics , mathematics , organic chemistry , computer science , acoustics , embedded system
CrB 4 O 6 N crystallizes in the non‐centrosymmetric space group P 6 3 mc (no. 186) with the lattice parameters a =5.1036(1), c =8.3519(3) Å, and a volume of 188.40(1) Å 3 . It was synthesized in a high‐pressure/high‐temperature experiment at 7 GPa and 1673 K and represents the first high‐pressure oxonitridoborate. It is built up of starlike‐shaped entities of four BO 3 N tetrahedra, connected via one common nitrogen atom that resembles the fourfold‐coordinated nitrogen atoms in the homeotypic nitridosilicates MYbSi 4 N 7 (M=Sr, Ba). Building up a network with channels that contain the Cr 3+ ions, CrB 4 O 6 N contains for the first time a tetrahedral building unit in contrast to trigonal planar B(O/N) 3 entities in all other known oxonitridoborates. The structural relations as well as the results of spectroscopic measurements and calculations on the chromium oxonitridoborate are discussed.

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