In our previous works we have shown that the search and investigation of crystalline mixed salts of amino acids with different anions is a promising direction for the discovery new materials (see [1] and references therein).

Recently we started a systematic investigation of salts of amino acids with the hexafluorosilicate anion (SiF₆^2–) [2]. In addition to simple salts comprising hexafluorosilicate anions, a mixed salt with different anions, namely 2L-His²⁺.2BF₄^–.SiF₆^2–.2H₂O (I), has been obtained. Continuing this work we obtained four more mixed crystalline salts: orthorhombic 2L-His²⁺.2ClO₄^–.SiF₆^2–.2H₂O (II) (space group P2₁2₁2, Z=2, a=10.1549(8) Å, b=14.847(1) Å, c=8.7536(7) Å, which is isostructural with (I)), monoclinic  2L-His²⁺.2Cl^–.SiF₆^2– (III) and isostructural 2L-His²⁺.2Br^–.SiF₆^2– (IV) (space group C2, Z=2, a=27.063(6) Å, b=7.1013(17) Å, c=5.5076(11) Å, β=92.141(11)°), as well as triclinic 2L-His²⁺.SO₄^2–.SiF₆^2–.3H₂O (V) (space group P1, Z=1, a=8.5005(17) Å, b=8.7896(18) Å, c=9.7286(19) Å, α=71.49(3)°, β=92.141(11)°, γ=86.17(3)°).

In the present work we will provide crystallization conditions of single crystals of these salts, their crystal and molecular structures as well as vibrational (infrared and Raman) spectra.

Apart from possible applications as materials with interesting physical properties (as many amino acid salts possess), the salts of amino acids with hexafluorosilicate anions may be used in stomatology as preparations having anti-caries activity [3].

References

[1] V.V. Ghazaryan, M. Fleck, A.M. Petrosyan, Mixed salts of amino acids with different anions,  J. Crystal Growth 362, 182-188(2013).

[2] V.V. Ghazaryan, M. Fleck, A.M. Petrosyan, Salts of amino acids with hexafluorosilicate anion,  J. Crystal Growth 362, 162-166(2013).

[3] Petrosyan A.M., Ghazaryan V.V., Fleck M., Harutyunyan A.V., Andriasyan L.H., Brsikyan N.A., Hexafluorosilicates of amino acids having anti-caries activity, Armenian patent #2695 (2012).

1. POSTER: New mixed salts of L-histidinium(2+) comprising hexafluorosilicate anions, Zip archive data, at least v2.0 to extract, 0MB

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