✦ LIBER ✦

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

✍ Scribed by Prof. Dr. S. Haussühl; J. Chrosch; Dr. F. Gnanam; Dr. E. Fiorentini; Prof. Dr. K. Recker; Dr. F. Wallrafen

Publisher: John Wiley and Sons
Year: 1990
Tongue: English
Weight: 402 KB
Volume: 25
Category: Article
ISSN: 0232-1300
DOI: 10.1002/crat.2170250602

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Single crystals of optical quality of L‐arginine HCl · H~2~O and L‐arginine HBr · H~2~O 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 d~211~ which surmounts the longitudinal electrostrictive constant d~111~ of alpha‐quartz by a factor three.

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