4-aminobenzoic acid

4-aminobenzoic acid ;
Names:	4-aminobenzoic acid; para-aminobenzoic acid; vitamin B10; PABA;
Formula:	NH2C6H4COOH;
Molar mass:	137.138 g/mol;
Density:	1.374 g/cm3 (α-form); 1.39 g/cm3 (β-form); 1.43 g/cm3 (γ-form); 1.48 g/cm3 (δ-form);
Crystal system:	monoclinic (α-form); a=18.571 Å, b=3.843 Å, c=18.632 Åα=90°, β=93.67°, γ=90°; monoclinic (β-form); a=6.278 Å, b=8.583 Å, c=12.365 Åα=90°, β=100.13°, γ=90°; cubic (γ-form); a=26.9945 Å, b=26.9945 Å, c=26.9945 Åα=90°, β=90°, γ=90°; monoclinic (δ-form); a=6.4341 Å, b=4.6151 Å, c=10.5313 Åα=90°, β=100.73°, γ=90°;
Shapes:	https://en.crystalls.info/w/uploads/media/5/52/Needle.json Needle ;
Color:	white;
Melting point:	187 °C460.15 K <br />368.6 °F <br />828.27 °R <br />;
Stability:	stable;
Hardness:	fragile;
Toxicity:	slightly toxic; LD50=1000mg/kg

Description

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

Can be bought in pharmacy (as vitamin B10 - in form of pills).

Due to low solubility in water, it's easier to grow crystals by cooling the solution.

Can be easily separated from insoluble impurities containing in the pharmacy pills by dissolving in hot water and filtration.

TableGraph

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

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)

4-aminobenzoic acid
Names:	4-aminobenzoic acid para-aminobenzoic acid vitamin B10 PABA
Formula:	NH₂C₆H₄COOH
Molar mass:	137.138 g/mol
Density:	1.374 g/cm³ (α-form) 1.39 g/cm³ (β-form) 1.43 g/cm³ (γ-form) 1.48 g/cm³ (δ-form)
Crystal system:	monoclinic (α-form) a=18.571 Å, b=3.843 Å, c=18.632 Åα=90°, β=93.67°, γ=90° monoclinic (β-form) a=6.278 Å, b=8.583 Å, c=12.365 Åα=90°, β=100.13°, γ=90° cubic (γ-form) a=26.9945 Å, b=26.9945 Å, c=26.9945 Åα=90°, β=90°, γ=90° monoclinic (δ-form) a=6.4341 Å, b=4.6151 Å, c=10.5313 Åα=90°, β=100.73°, γ=90°
Shapes:	Needle
Color:	white
Melting point:	187 °C460.15 K <br />368.6 °F <br />828.27 °R <br />
Stability:	stable
Hardness:	fragile
Toxicity:	slightly toxic LD₅₀=1000mg/kg