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High‐Pressure Synthesis of Cd(NH 3 ) 2 [B 3 O 5 (NH 3 )] 2 : Pioneering the Way to the Substance Class of Ammine Borates
Author(s) -
Sohr Gerhard,
Ciaghi Nina,
Schauperl Michael,
Wurst Klaus,
Liedl Klaus R.,
Huppertz Hubert
Publication year - 2015
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.201500706
Subject(s) - boron , adduct , raman spectroscopy , chemistry , nitrogen , ammonia , aqueous solution , amine gas treating , inorganic chemistry , infrared spectroscopy , crystallography , organic chemistry , physics , optics
To date, the access to the substance class of borates containing nitrogen, for example, nitridoborates, oxonitridoborates, or amine borates, was an extreme effort owing to the difficult starting materials and reaction conditions. Although a number of compounds containing boron and nitrogen are known, no adduct of ammonia to an inorganic borate has been observed so far. A new synthetic approach starting from the simple educts CdO, B 2 O 3 , and aqueous ammonia under conditions of 4.7 GPa and 800 °C led to the synthesis of Cd(NH 3 ) 2 [B 3 O 5 (NH 3 )] 2 as the first ammine borate. We thoroughly characterized this compound on the basis of low‐temperature single‐crystal and powder X‐ray diffraction data, IR and Raman spectroscopy, and by quantum theoretical calculations. This contribution shows that the adduct of NH 3 to the BO 3 group of a complex B–O network can be stabilized, opening up a fundamentally new synthetic route to nitrogen‐containing borates.