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Low Melting Tetracyanidoborate Salts with Alkyl‐, Arylammonium, and Pyridinium Cations: Syntheses, Structures, Properties.
Author(s) -
Siegesmund Antje,
Topp Anke,
Nitschke Christian,
Köckerling Martin
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201702328
Subject(s) - chemistry , pyridinium , melting point , alkyl , solubility , ionic bonding , polar , crystallography , inorganic chemistry , annealing (glass) , isothermal process , crystal structure , ion , organic chemistry , materials science , thermodynamics , physics , astronomy , composite material
Abstract The syntheses and single crystal structures of five new tetracyanidoborate salts with N‐based cations are described. Three of these compounds contain cations with acidic H atoms. The H‐bond strength, expressed by D‐A distances is correlated with a shift of the CN stretching mode frequency in the IR spectra. Melting points are found between 59 °C and 214 °C, i. e. at the borderline between ionic liquids and molten salts. Isothermal annealing indicates slow decomposition. Solubility tests in polar solvents show a strong dependence on the cation.