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Carbodiimides with Extended Structures by an Azide‐Cyanide Route: Synthesis and Crystal Structure of M 2 Cl 2 NCN (M = Eu and Sr)
Author(s) -
Liao Wuping,
Dronskowski Richard
Publication year - 2005
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200400350
Subject(s) - sodium azide , cyanide , chemistry , sodium , europium , sodium cyanide , phase (matter) , ion , chloride , crystallography , crystal structure , crystal (programming language) , carbodiimide , strontium , inorganic chemistry , analytical chemistry (journal) , organic chemistry , programming language , computer science
Single crystals of two new europium/strontium chloride carbodiimides M 2 Cl 2 NCN were obtained in high yields from the reactions of the corresponding chlorides, sodium azide and sodium cyanide at elevated temperatures. The crystal structures of isotypic Eu 2 Cl 2 NCN and Sr 2 Cl 2 NCN ( C 2/ m , Z = 2; Eu phase: a = 9.6200(17), b = 4.2299(7), c = 7.2224(13) Å and β = 98.002(4)°, wR 2 = 0.0598, R 1 = 0.0242; Sr phase: a = 9.6225(9), b = 4.2508(4), c = 7.2498(6) Å and β = 97.839(4)°, wR 2 = 0.0446, R 1 = 0.0223) contain M 2+ /NCN 2‐ layers separated by chloride ions. The M 2+ are sevenfold coordinated, and the NCN 2‐ units exhibit the carbodiimide shape.