Crystal growth and physical properties of monoclinic L-arginine hydrochloride monohydrate, C6H14O2N4HCl · H2O, and L-arginine hydrobromide monohydrate, C6H14O2N4HBr · H2O

Autor: S. Haussühl, J. Chrosch, F. Wallrafen, E. Fiorentini, K. Recker, F. D. Gnanam
Rok vydání: 1990
Předmět:
Zdroj: Crystal Research and Technology. 25:617-623
ISSN: 1521-4079
0232-1300
DOI: 10.1002/crat.2170250602
Popis: Single crystals of optical quality of L-arginine HCl · H2O and L-arginine HBr · H2O with dimensions up to 80 × 60 × 30 mm have been grown from aqueous solutions by controlled evaporation at about 310 K. The isotypic crystals exhibit a quite similar behaviour with respect to morphological, pyroelectric, dielectric, optical, thermal expansion, electrostrictive, electrooptic, elastic, thermoelastic and non-linear optical properties. A distinct anisotropy of the longitudinal elastic stiffness is observed with a maximum along the direction of the alignment of the arginine ions. Nearly in the same direction a minimum of thermal expansion, dielectric constant and index of refraction is found. The pyroelectric, electrostrictive, electrooptic and non-linear-optical effects are of only mediocre magnitude except the electrostrictive constant d211 which surmounts the longitudinal electrostrictive constant d111 of alpha-quartz by a factor three.
Databáze: OpenAIRE
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