A new compound in the Lys-HIO(3)-H(2)O system (where Lys = lysine), lysine-iodic acid (1/3), C(6)H(14)N(2)O(2).3HIO(3), 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) degrees, D(x) = 2.87 Mg m(-3), space group P2(1), 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(3)(-) and I(2)O(5)OH(-).

Some new analogues of the nonlinear optical crystal L-arginine phosphate monohydrate (LAP) (Arg • HI0 3 , Arg • 2HI0 3 , Lys • HI0 3 , Lys • 2HI0 3 , Lys • 3HI0 3 , Bet • 3HI0 3 ) were obtained and investigated by means of IR, NQR, X-ray diffraction and SHG methods. The importance of this class of crystals for revealing new nonlinear optical crystals is pointed out.

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The structure o f iodates of α- and β-alanine ( Ala) (2(β-Ala • HIO3) • H2O , β-Ala-2HIO3 , D L-Ala• HIO3 • 2H2O, L-Ala • HIO3) and L-lysine (L-Lys) (L-Lys • HIO3, L-Lys • 2HIO3,L-Lys • 3HIO3, L-Lys • 6HIO3) have been investigated by means of iodine-127 NQR, IR spectroscopy and X-ray diffraction