Crystal growth, structural, optical, thermal and SHG studies of γ-glycine single crystal grown from ammonium formate

Azhagan, S. Anbuchudar; Ganesan, S.

doi:10.1016/j.ijleo.2012.06.077

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…The indexed powder XRD patterns of the grown crystals are shown in figure 2. The characteristic peak at 25.5°(2θ ) corresponds to γ -glycine [27]. The calculated lattice parameter values are, a = b = 7.05Å, c = 5.50Å and V = 237Å 3 .…”

Section: Powder X-ray Diffraction Analysismentioning

confidence: 92%

Effect of cesium chloride addition on crystal growth, structural, thermal and optical properties of γ‐glycine single crystal

Yogambal

Vizhi

Babu

2014

Crystal Research and Technology

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Single crystals of γ‐glycine in the presence of cesium chloride were grown from aqueous solution by low temperature solution growth technique. The phase purity and crystal structure of the grown crystals were confirmed by Powder X‐ray diffraction analysis. The presence of functional groups were confirmed by FT‐IR spectrum. Thermal analysis of the grown crystal was determined by thermogravimetric and differential thermal analysis (TG/DTA), which results the thermal stability of the grown crystal. The optical absorption and lower cut‐off values were ascertained by recorded UV‐Visible spectrum of γ‐glycine crystals. The existence of second harmonic generation efficiency of frequency doubling was found to be 6 times greater than that of KDP.

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Section: Powder X-ray Diffraction Analysismentioning

confidence: 92%

Effect of cesium chloride addition on crystal growth, structural, thermal and optical properties of γ‐glycine single crystal

Yogambal

Vizhi

Babu

2014

Crystal Research and Technology

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“…Challenging polymorph βglycine is highly unstable and undergoes solutionmediated phase transformation in solution, thereby it transforms rapidly into other forms of glycine. From the thorough literature study of glycine polymorphs it was concluded that metastable αpolymorphic form of glycine produces spontaneously in pure aqueous solutions whereas the most thermodynamically stable form γ-glycine can be obtained in acidic or basic solution, low pH or high pH solutions or in the presence of inorganic salts or tailor made additives [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][19][20][21][22]. In recent times, γ-glycine single crystals have grown in the presence of potassium chloride [31], magnesium chloride [15], phosphoric acid [16], ammonium acetate [17], ammonium carbonate [18], zinc acetate [23], strontium chloride [29], cesium chloride [30] and ammonia solutions [24].…”

Section: Introductionmentioning

confidence: 99%

Selective crystallization of gamma glycine for NLO applications using magnesium sulfate (MgSO₄) as an additive

Azhagan¹,

Kathiravan²

2019

Materials Science-Poland

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Crystallization of γ-glycine in the presence of selected concentration (9 g/mL) of tailor-made additive magnesium sulfate heptahydrate salt (MgSO 4 ·7H 2 O) has been studied at ambient temperature by adopting slow solvent evaporation procedure. The morphological modifications of glycine crystals grown from pure aqueous solutions of glycine and from glycine solutions containing magnesium species in the amount of 0.1 g/mL to 16 g/mL have been investigated thoroughly. The crystalline nature and phase identification of the crystalline material were confirmed by X-ray powder diffraction and SXRD studies. NMR studies revealed the information about the molecular conformation in solution, phase changes, functional groups and chemical environment. FT-IR spectra revealed distinct difference between α and γ-glycine polymorphs in the region around 880 cm −1 to 930 cm −1 . The grown γ-glycine crystal had a lower cut-off value at 200 nm and the bandgap value evaluated from the Tauc plot was found to be 5.83 eV. The marked differences between α and γ-polymorphs of glycine were also revealed by DSC thermograms. The mechanical strength of the γ-glycine crystal was studied with the help of Vickers microhardness instrument. Kurtz-powder NLO study proved the generation of second harmonics (i.e. green light emission) in the grown γ-glycine crystal and its efficiency was calculated as 1.44 times better than that of the reference material potassium dihydrogen phosphate.

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“…γ-glycine was reported to form in acidic or basic solutions * E-mail: anbuchudarazhagan@gmail.com or in solutions with addition of electrolytes or in the presence of tailor-made additives or other inorganic impurities/additives. γ-glycine was reported to become visible, when supersaturation generation is very slow, such as controlled evaporation of solvents [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]34]. The investigation of polymorphism in pharmaceuticals has attracted an interest of scientific community because of its technological applications.…”

Section: Introductionmentioning

confidence: 99%

Crystallization, habit modification and control of nucleation of glycine polymorphs from aqueous solutions doped with magnesium sulfate impurity

Azhagan¹,

Kathiravan²,

Priya³

2018

Materials Science-Poland

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The influence of magnesium sulfate as an additive in the nucleation of α and γ-polymorphs of glycine crystallized from aqueous solutions has been explored for the first time. Based on crystallization experiments, it was concluded that lower concentration of magnesium sulfate, say less than 2 g/mL, favors α-nucleation sites, whereas the optimized concentration of magnesium sulfate impurity to yield -nucleation sites is 2 g/mL and above. The nucleation time span (in days), solubility and pH were measured for α- and γ-nucleation sites in the aqueous solutions doped with magnesium sulfate. The glycine polymorphs α- and γ-single crystals were grown by slow solvent evaporation technique at ambient temperature. Crystal habit of glycine polymorphs was investigated and analyzed using goniometry. The unit cell dimensions and space group of the as-grown crystal were identified by single crystal XRD analysis. Both α- and γ-polymorphs of glycine were characterized structurally by powder XRD studies. The percentage of magnesium present in the grown glycine crystals was estimated by inductively coupled plasma optical emission spectrometry elemental analysis (ICP-OES). The nonlinear optical properties of the γ-glycine crystals were examined by Q-switched high energy Nd:YAG laser. The second harmonic generation output efficiency of the as-grown gamma glycine single crystals was computed to be 1.31 times superior than that of the reference material potassium dihydrogen phosphate (KDP).

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Crystal growth, structural, optical, thermal and SHG studies of γ-glycine single crystal grown from ammonium formate

Cited by 6 publications

References 14 publications

Effect of cesium chloride addition on crystal growth, structural, thermal and optical properties of γ‐glycine single crystal

Effect of cesium chloride addition on crystal growth, structural, thermal and optical properties of γ‐glycine single crystal

Selective crystallization of gamma glycine for NLO applications using magnesium sulfate (MgSO₄) as an additive

Crystallization, habit modification and control of nucleation of glycine polymorphs from aqueous solutions doped with magnesium sulfate impurity

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Crystal growth, structural, optical, thermal and SHG studies of γ-glycine single crystal grown from ammonium formate

Cited by 6 publications

References 14 publications

Effect of cesium chloride addition on crystal growth, structural, thermal and optical properties of γ‐glycine single crystal

Effect of cesium chloride addition on crystal growth, structural, thermal and optical properties of γ‐glycine single crystal

Selective crystallization of gamma glycine for NLO applications using magnesium sulfate (MgSO4) as an additive

Crystallization, habit modification and control of nucleation of glycine polymorphs from aqueous solutions doped with magnesium sulfate impurity

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Selective crystallization of gamma glycine for NLO applications using magnesium sulfate (MgSO₄) as an additive