Edge‐sharing SiN 4 Tetrahedra in the Highly Condensed Nitridosilicate BaSi 7 N 10

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 .