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Edge‐sharing SiN 4 Tetrahedra in the Highly Condensed Nitridosilicate BaSi 7 N 10
Author(s) -
Huppertz Hubert,
Schnick Wolfgang
Publication year - 1997
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.19970030213
Subject(s) - tetrahedron , crystallography , barium , crystal structure , enhanced data rates for gsm evolution , materials science , vertex (graph theory) , molar ratio , physics , chemistry , combinatorics , metallurgy , mathematics , graph , catalysis , computer science , telecommunications , biochemistry
The novel nitridosilicate BaSi 7 N 10 was obtained by the reaction of barium metal with Si(NH) 2 in a special high‐frequency furnace at 1650 °C. The single‐crystal structure determination ( a = 687.29(3), b = 671.29(3), c = 963.28(4) pm, β = 106.269(3)°, PC, Z = 2, R 1 = 0.0497, wR 2 = 0.0924) reveals a network structure of connected SiN 4 tetrahedra. BaSi 7 N 10 is the first nitridosilicate with both corner and edge‐sharing SiN 4 tetrahedra. Unlike the situation in normal oxosilicates, vertex‐sharing of SiN 4 tetrahedra is not exclusively favored over edge‐sharing. With a Si:N molar ratio of 7:10, BaSi 7 N 10 is the most highly condensed multinary nitridosilicate known and has almost the same degree of condensation as binary Si 3 N 4 .