Single crystals of L-arginine diphosphate (L-HN:C(NH 2 )NH(CH 2 ) 3 CH(NH 2 )COOH . 2 H 3 PO 4 , abbreviated as LADP) with dimensions of ca 15 x 20 x 40 mm and of optical quality were grown by controlled evaporation of aqueous solutions. A structure analysis showed that LADP (space group P2 1 2 1 2 1 , a 1 = 9.681(2), a 2 = 21.756(4), a 3 = 7.000(14) A, Z = 4 at 293 K) is isotypic to L-arginine . 2 H 3 AsO 4 . The tensors of thermal expansion as well as of dielectric, elastic, thermoelastic, piezoelastic and piezoelectric properties were measured and compared with corresponding properties of L-arginine . H 3 PO 4 . H 2 O (LAP).

Crystal structure and properties of L-arginine diphosphate

This is the first report representing Brillouin Scattering Studies on single crystals of monoclinic LAP, which is a new organic material very useful for secondary harmonic generation. The crystal elastic constants were evaluated from the measured data. The curves of the reciprocal velocity and the acoustic velocity as a function of temperature are given here.

Zhao Mingzhuo

Papers

Brillouin Scattering Study on the single crystals ofl-arginine phosphate (LAP)