Acta Crystallographica Section B

Structural Science

Volume 55, Part 2 (April 1999)

research papers

Acta Cryst. (1999). B55, 221-225 [ doi:10.1107/S0108768198011975 ]

Interaction of lysine with iodic acid

A. M. Petrosyan, R. P. Sukiasyan, S. S. Terzyan and V. M. Burbelo

Abstract: A new compound in the Lys-HIO₃-H₂O system (where Lys = lysine), lysine-iodic acid (1/3), C₆H₁₄N₂O₂.3HIO₃, has been discovered. Its crystals display nonlinear optical properties. They were investigated by X-ray analysis, IR spectroscopy and NQR methods. The parameters of the unit cell are a = 8.360 (2), b = 6.330 (1), c = 14.750 (3) Å, [beta] = 92.86 (3)°, D_x = 2.87 Mg m^-3, space group P2₁, Z = 2. The three iodate groups in the structure have different roles. Interaction of lysine and iodic acid results in a compound containing a doubly protonated lysine cation and two counterions, IO and I₂O₅OH^-.