Crystal growth, optical, mechanical and electrical properties of organic NLO material γ-glycine

Abstract

Single crystals of organic non-linear optical material, γ-glycine have been grown by gel method for the first time. The γ -phase is confirmed by single crystal XRD. The presence of various functional groups of γ-glycine are confirmed by FTIR. The UV-Vis-NIR spectrum reveals the high percentage of transmission of the sample in the entire visible region. The SHG of γ-glycine is confirmed by Kurtz powder technique. TGA-DTA studies indicate that the crystal is structurally stable upto 170 o C. Microhardness investigations are conducted on the grown crystals. The dielectric constant measurements are carried out and the nature of variation of dielectric constant ε΄ and dielectric loss D in the frequency range of 50 Hz to 5 MHz is studied and reported. Photoconductivity studies of γ-glycine crystals revealed the negative photoconducting nature.

Effect of sodium chloride on the nucleation and polymorphic transformation of glycine

“…The g-form is thermodynamically the most stable form at room temperature but transforms to the a-form at high temperatures (165-175 1C) [19][20][21]. The growth of g-form crystals can be from aqueous solution or gel in the presence of additives [22], from supersaturated solution irradiated with plane-polarized laser light [23], or from surfactantbased microemulsion and lamellar phases [24]. Previous studies [19][20][21] have already investigated the effect of additives on the crystal morphology and polymorphism of glycine.…”

Synthesis, crystal growth and characterization of glycine lithium sulphate

“…The Vickers microhardness number was calculated using H v ¼ 1.854 P/d 2 (kg/mm 2 ), where H v is the microhardness number, P is the load in kg and d is the diagonal length of the indenter impression in mm. The hardness value of GLS is found to be 389 kg/mm 2 at the load 0.025 kg, whereas for g-glycine at the same load H v is found to be 38 kg/mm 2 [14]. The present investigation indicates that the mechanical strength of GLS is higher compared to that of starting material, glycine.…”

Antimicrobial Screening of Endophytic Fungi Isolated from the Aerial Parts of Paepalanthus chiquitensis (Eriocaulaceae) Led to the Isolation of Secondary Metabolites Produced by Fusarium fujikuroi

“…25 The glycine (amino acetic acid) has the molecular formula NH 2 CH 2 COOH and is the simplest amino acid, optically inactive and exist as a zwitterion in solution. 26 The chemical structure of the compound 3 can be the combined product of the junction of the 4-butyl-picolinic acid with the glycine resulting in its acidic and basic caractheristics present.…”