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Description
Various kinds of amino acid salts are known, which are interesting from both fundamental and applied points of view. In the present review crystals with dimeric, trimeric and tetrameric cations are considered. Crystals and structure types of salts with dimeric cations prevail; currently the following ones have been observed: (A+···A), A+(A+···A), [A(1)+···A(2)], A(1)+[A(2)+···A(2)], [A(1)+[A(1)+···A(2)], (A+···A+), and (A2+···A+), [A(1)2+···A(2)], where A is an amino acid and A(1), A(2) are different amino acids. Besides trimeric (A+···A···A+) cations also two types of tetrameric cations exist, [A+···(A+···A)··· A+] and [2A+···A···A+]. All these salts are characterized by strong to very strong hydrogen bonds. Some crystals exhibit ferroelectric and pyroelectric properties.
