S-(−)-1-phenyl ethyl ammonium(1+) sulphate and S-(−)-1-phenyl ethyl ammonium(1+) hydrogen phosphate 2.5 hydrate, preparation and characterization of crystallographic, optical and dielectric properties

S-(−)-1-phenyl ethyl ammonium(1+) sulphate and S-(−)-1-phenyl ethyl ammonium(1+) hydrogen phosphate 2.5 hydrate, preparation and characterization of crystallographic, optical and dielectric properties

S-(−)-1-phenyl ethyl ammonium(1+) sulphate and S-(−)-1-phenyl ethyl ammonium(1+) hydrogen phosphate 2.5 hydrate were prepared at laboratory temperature by slow evaporation of aqueous solutions of a mixture of S-(−)-1-phenyl ethyl amine and H 2SO 4 or H 3PO 4 in a molar ratio of 2: 1. The chirality o...

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Bibliographic Details
Published in:Journal of molecular structure Vol. 980; no. 1; pp. 31 - 38
Main Authors: Cihelka, Jaroslav, Havlíček, David, Gyepes, Róbert, Němec, Ivan, Koleva, Zoja
Format: Journal Article
Language:English
Published: Elsevier B.V 10-09-2010
Subjects:
Beta
Chiral amines – salts
Crystal structure
Crystallization
Density
Dielectric properties
Hydrates
IR and Raman spectroscopy
Mathematical analysis
Phosphates
Second harmonic generation
Sulfates
Second harmonic generation
IR and Raman spectroscopy
Dielectric properties
Chiral amines – salts
Crystal structure
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Summary:S-(−)-1-phenyl ethyl ammonium(1+) sulphate and S-(−)-1-phenyl ethyl ammonium(1+) hydrogen phosphate 2.5 hydrate were prepared at laboratory temperature by slow evaporation of aqueous solutions of a mixture of S-(−)-1-phenyl ethyl amine and H 2SO 4 or H 3PO 4 in a molar ratio of 2: 1. The chirality on the organic amine was retained during the preparation and the obtained substances crystallized in non-centrosymmetric space groups. S-(−)-1-phenyl ethyl ammonium (1+) sulphate crystallizes in a monoclinic crystal system, space group C2, a = 10.8050(5) Å, b = 6.1080(4) Å, c = 13.3430(8) Å, β = 90.679(4)°, V = 880.54(9) Å 3, Z = 2, calculated density 1.284 g cm −3. S-(−)-1-phenyl ethyl ammonium(1+) hydrogen phosphate 2.5 hydrate crystallizes in a monoclinic crystal system, space group P2 1, a = 16.7810(10) Å, b = 6.2870(2) Å, c = 19.7060(12) Å, β = 109.160(2)°, V = 1963.86(18) Å 3, Z = 4, calculated density 1.303 g cm −3. Space groups C2 and P2 1 belong amongst “polar” groups, that could exhibit interesting dielectric properties, which have been studied (dependence of the polarization on an external electric field or of the relative permittivity on the temperature), and generation of the second harmonic frequency. Both substances were further characterized by chemical analysis, X-ray structural and powder analysis, infrared and Raman spectroscopy and thermal analysis (DTA, TGA).
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2010.06.033