Optical, mechanical and thermal characterization of l-threonine single crystals grown in dimethyl urea solution

Shanthi, A.; Krishnan, C.; Selvarajan, P.

doi:10.1088/0031-8949/88/03/035801

Cited by 8 publications

(2 citation statements)

References 26 publications

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“…Rodriguez et al (2003) published a study of linear and nonlinear optical properties of this crystal, where they determined refractive indices and their dispersion, along with phase-matching conditions for second harmonic generation at a wavelength of 1064 nm (typical Nd:YAG laser wavelength for SHG experiments), proving the suitability of Lthreonine as nonlinear optical material. Recently, Shanti et al (2013) showed that from a solution of dimethylurea, large single crystals can be grown and confirmed the physical parameters published by Rodriguez et al (2003).…”

Section: Threoninesupporting

confidence: 58%

Amino Acid Structures

Fleck

Petrosyan

2014

Salts of Amino Acids

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Although this book deals with salts of amino acids, this chapter discusses the structures of pristine amino acids, since these molecular structures are also found in salts, and factors as solubility and conditions of crystal growth are important for the synthesis of amino acid salts as well as the pure form. In this context, the impact of minimal changes in conditions (such as impurities) on the growth of amino acid crystals is noted. The structural variation is very high, as not only amino acids differ from each other, but many amino acids exist in more than one form. This refers to the fact that enantiopure crystals can be grown as well as racemates (so-called DL-amino acids). Moreover, often more than one hydration state is found: Anhydrous forms are common, but many amino acids form hydrated crystals. For some amino acids (e.g., glycine, proline, methionine), more than one polymorph of the same hydration state is found. Some of these polymorphs form at ambient condition, often due to minuscule changes in conditions. For others, variation in temperature and pressure has been found to be the cause of the formation of different polymorphs. High-pressure data are available for some amino acids (e.g., alanine, serine, cysteine). Most amino acids are found to form a so-called head-to-tail motif, where acid and amino groups connect to form infinite chains. In some of the larger, nonpolar amino acids, a bilayer pattern is found, where polar groups of opposing molecules face each other, forming a layer, with the hydrophobic side chain facing outward (this motif is found in phenylalanine, methionine, leucine, or isoleucine). Not all amino acids crystallize readily, as is proved by the crystal structure of L-arginine, which could be determined only very recently, and that of lysine, which could not be solved at all to date. In addition to the standard 20, some nonstandard amino acids are discussed. Finally, notes on remarkable physical effects (such as piezoelectric data) or possible applications (as for instance the interactions of amino acids with carbon nanotubes) are presented.

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Section: Threoninesupporting

confidence: 58%

Amino Acid Structures

Fleck

Petrosyan

2014

Salts of Amino Acids

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“…The key factor for successful growth of any crystal is the proper selection of solvents. To find out the suitable solvent, the solubility test was carried out by gravimetrical method [5] and here water was found to be the suitable solvent for growing crystals. The solubility of the solute can be determined by dissolving the solute in the solvent maintained at a constant temperature with continuous stirring.…”

Section: Growth and Solubilitymentioning

confidence: 99%

Growth, structural, mechanical and dielectric studies of undoped and urea doped L-alaninium maleate

Krishnasamy¹,

Subramanian²,

Selvarajan³

2013

IJSEA

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Undoped and urea doped L-alaninium maleate crystals were grown by solution method with slow evaporation technique. Solubility studies were carried out for the grown crystals and it is found that solubility increases with temperature for both the samples. XRD studies were performed to find the crystal structure of the samples. NLO activity of the grown crystals was studied using a Nd:YAG laser and SHG efficiency was found for both the samples. Microhardness studies were performed to understand the mechanical strength of the samples. Measurements of values of dielectric constant and dielectric loss were carried out and the electrical processes that are taking place in the samples are discussed.

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Influence of gamma radiation on the properties of l-ascorbic acid crystal for photonic applications

Tilak¹,

Kumar²

2021

J Mater Sci: Mater Electron

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Optical, mechanical and thermal characterization of l-threonine single crystals grown in dimethyl urea solution

Cited by 8 publications

References 26 publications

Amino Acid Structures

Amino Acid Structures

Growth, structural, mechanical and dielectric studies of undoped and urea doped L-alaninium maleate

Influence of gamma radiation on the properties of l-ascorbic acid crystal for photonic applications

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