Investigation of Some New Nonlinear Optical Crystals by Means of NQR, IR and X-Ray Diffraction Methods

Abstract

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.

Growth and characterization of nonlinear optical single crystals of l-arginine diiodate

“…The absence of absorption band between 600 and 700 cm -1 due to OH stretch of HIO 3 confirms absence of any free HIO 3 molecule in the lattice of LADI [22].…”

“…2 1200 cm -1 . The iodate (IO 3 À ) vibrations appear between 700 and 850 cm -1 [22]. The torsional oscillation of NH 3 + occurs at 540.7 cm -1 .…”

“…The earlier work was concentrated on the growth of bulk size crystals of L-arginine diiodate and limited studies like NQR and IR. The NQR and IR studies indicate that the formation of ArgU2HIO 3 is a peculiarity of the arginine structure (namely, due to the existence of both amino and guanidyl groups) and not the property of HIO 3 to form acid compounds [22]. The growth of LADI in bulk size with dimensions up to 60 Â 50 Â 50 mm 3 was reported and its decomposition temperature and optical absorption edge were studied and reported by Petrosyan et al [23].…”

Vibrational spectra of l-lysine monohydrochloride dihydrate and its two anhydrous forms

“…Salts of L-lysine are studied to a lesser degree [1][2][3][4][5][6][7][8][9][10][11][12]. Ramesh Babu et al have grown and investigated crystals of L-lysine mono hydrochloride dihydrate (L-LysÁHClÁ2H 2 O) [8,9].…”

Studies on the growth and characterization of L-cysteine hydrogen fluoride single crystal

“…The stretching bands S-H and C-S appear at 2515 cm −1 . The group of S-H thiol is observed at 2571 cm −1 [11]. The band of C-S absorption is 664 cm −1 .…”