Glycine

Glycine ;
Names:	glycine; aminоacetic acid; 2-aminoethanoic acid; Gly; Е640 food additive;
Formula:	NH2CH2COOH;
Molar mass:	75.067 g/mol;
Density:	1.1607 g/cm3;
Crystal system:	monoclinic (α-glycine); a=5.107 Å, b=12.04 Å, c=5.46 Åα=90°, β=111.82°, γ=90°; monoclinic (β-glycine); a=5.0943 Å, b=6.286 Å, c=5.3831 Åα=90°, β=113.21°, γ=90°; hexagonal (γ-glycine); a=7.035 Å, b=7.035 Å, c=5.481 Åα=90°, β=90°, γ=120°;
Shapes:	https://en.crystalls.info/w/uploads/media/0/0e/Truncated_rhombic_bipyramid.json Truncated rhombic bipyramid https://en.crystalls.info/w/uploads/media/3/35/Deformed_tetragonal_bipyramid.json Deformed tetragonal bipyramid https://en.crystalls.info/w/uploads/media/9/9a/Truncated_deformed_hexagonal_prism.json Truncated deformed hexagonal prism ;
Color:	colorless;
Melting point:	265 °C538.15 K <br />509 °F <br />968.67 °R <br /> (α-glycine); 266.7 °C539.85 K <br />512.06 °F <br />971.73 °R <br /> (γ-glycine);
Decomposition point:	290 °C563.15 K <br />554 °F <br />1,013.67 °R <br />;
Refractive index:	2.25 (γ-glycine);
Magnetic properties:	diamagnetic; χ=-4.03 · 10-5cm³/mol;
Stability:	stable

Description

Organic compound, simple monobasic aminoacid. Doesn't form water hydrates.

From water solution without impurities α-glycine crystals are formed. Some impurity like sodium chloride (>8g per 100g of water) or barium nitrate could form γ-glycine crystals.
In water solutions may form adducts with other compounds. Adduct crystals have different shapes and properties comparing to pure compounds.

Notes

Small crystals of α-glycine can spontaneously phase into γ-glycine, becoming opaque and craked. Larged crystals are stable

Storage conditions

Keep in its original form or under several layers of varnish at average humidity and room temperature. Do not keep crystals near heaters.

Solubility

TableGraph

Temperature	g/`100,00` g water	g/`100,00` g ethanol 75%	g/`100,00` g ethanol 90%	g/`100,00` g ethanol	g/`100,00` g methanol	g/`100,00` g acetone	g/`100,00` g pyridine	g/`100,00` g formamide	g/`100,00` g quinoline	g/`100,00` g 1-butanol
0°C273.15 K <br />32 °F <br />491.67 °R <br />		`0.2`
25°C298.15 K <br />77 °F <br />536.67 °R <br />	`25.3`	`0.448`	`0.053`	`0.0037`	`0.041`	`0.0029`	`0.61`	`0.555`	`0.07`	`0.00089`
45°C318.15 K <br />113 °F <br />572.67 °R <br />		`0.756`
60°C333.15 K <br />140 °F <br />599.67 °R <br />		`1.23`
75°C348.15 K <br />167 °F <br />626.67 °R <br />	`57.5`

Insoluble in diethyl ether.

Gallery

α-GlycineGlycine, Manzana cristal, twitter.comManzana cristalTwitter.com
α-Glycine, 1cmGlycine, Maxim MartynovMaxim Martynov
β-GlycineGlycine, Manzana cristal, twitter.comManzana cristalTwitter.com
γ-GlycineGlycine, Manzana cristal, twitter.comManzana cristalTwitter.com
γ-Glycine, 3cm x 2cmGlycine, Maxim MartynovMaxim Martynov
γ-GlycineGlycine, Manzana cristal, twitter.comManzana cristalTwitter.com
γ-GlycineGlycine, Sergey Solobchuk, VKontakteSergey SolobchukVKontakte
γ-Glycine, 1cmGlycine, Maxim MartynovMaxim Martynov

Sources

Acids

Inorganic

Boric (H₃BO₃) • Disulfozirconium (H₂ZrO(SO₄)₂) • Tetrachlorauric (H[AuCl₄])

Organic

4-aminobenzoic (H₂NC₆H₄COOH) • Acetylsalicylic (C₉H₈O₄) • Ascorbic (C₆H₈O₆) • Benzoic (C₆H₅СООН) • Citric (C₃H₅O(COOH)₃) • Cyclamic (C₆H₁₃NO₃S) • Glutamic (C₅H₉NO₄) • Glycine (NH₂CH₂COOH) • Oxalic (HOOCСООН) • Phenol (C₆H₅OH) • Phthalic acid (C₈H₆O₄) • Saccarin (C₇H₅NO₃S) • Salycilic (С6Н4(OH)CООН) • Sulfamic (H₂NSO₃H) • Succinic (НООССН2СН2СООН) • Tartaric (C₄H₆O₆) • Trichloroisocyanuric (C₃Cl₃N₃O₃) • Vanillic (C₈H₈O₄)

Glycine compounds
Diglycine hydrochloride (2NH₂CH₂COOH · HCl) • Diglycine oxalate ((NH₂CH₂COOH)₃ · H₂C₂O₄) • Glycine (NH₂CH₂COOH) • Glycinecopper(II) sulfate ([Cu(NH₂CH₂COOH)]SO₄) • Triglycine sulfate ((NH₂CH₂COOH)₃ · H₂SO₄)

Glycine
Names:	glycine aminоacetic acid 2-aminoethanoic acid Gly Е640 food additive
Formula:	NH₂CH₂COOH
Molar mass:	75.067 g/mol
Density:	1.1607 g/cm³
Crystal system:	monoclinic (α-glycine) a=5.107 Å, b=12.04 Å, c=5.46 Åα=90°, β=111.82°, γ=90° monoclinic (β-glycine) a=5.0943 Å, b=6.286 Å, c=5.3831 Åα=90°, β=113.21°, γ=90° hexagonal (γ-glycine) a=7.035 Å, b=7.035 Å, c=5.481 Åα=90°, β=90°, γ=120°
Shapes:	Truncated rhombic bipyramid Deformed tetragonal bipyramid Truncated deformed hexagonal prism
Color:	colorless
Melting point:	265 °C538.15 K <br />509 °F <br />968.67 °R <br /> (α-glycine) 266.7 °C539.85 K <br />512.06 °F <br />971.73 °R <br /> (γ-glycine)
Decomposition point:	290 °C563.15 K <br />554 °F <br />1,013.67 °R <br />
Refractive index:	2.25 (γ-glycine)
Magnetic properties:	diamagnetic χ=-4.03 · 10^-5cm³/mol
Stability:	stable

Glycine

Description

Where to buy

Influence of impurities

Notes

Storage conditions

Solubility

Gallery

Sources

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