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Properties of substance:

L-leucine



skc-file

Group of substances:

organic

Physical appearance:

colorless hexagonal crystals

Empirical formula (Hill's system for organic substances):

C6H13NO2

Structural formula as text:

(CH3)2CHCH2CH(NH2)COOH

Molar/atomic mass: 131.1729

Melting point (°C):

294

Decomposition temperature (°C):

295

Solubility (g/100 g of solvent):

acetic acid: 10.3 (20°C) [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: 0.072 (17°C) [Ref.]
water: 2.22 (0°C) [Ref.]
water: 2.281 (5°C) [Ref.]
water: 2.301 (10°C) [Ref.]
water: 2.332 (15°C) [Ref.]
water: 2.374 (20°C) [Ref.]
water: 2.44 (25°C) [Ref.]
water: 2.49 (30°C) [Ref.]
water: 2.568 (35°C) [Ref.]
water: 2.658 (40°C) [Ref.]
water: 2.764 (45°C) [Ref.]
water: 2.81 (50°C) [Ref.]
water: 3.028 (55°C) [Ref.]
water: 3.189 (60°C) [Ref.]
water: 3.374 (65°C) [Ref.]
water: 5.34 (100°C) [Ref.]

Density:

1.293 (18°C, g/cm3)

Dissociation:

pKBH+ (1) = 2.33 (25°C, water)
pKa (1) = 9.6 (25°C, water)

References:

  1. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 453-456
  2. Yalkowsky S.H., Yan H. Handbook of aqueous solubility data. - CRC Press, 2003. - pp. 316
  3. Губен И. Методы органической химии. - Т. 4, Вып. 2. - М.-Л.: ГНТИХЛ, 1949. - pp. 911 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 156 [Russian]
  5. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 458 [Russian]
  6. Тюкавкина Н.А., Бауков Ю.И. Биоорганическая химия. - М.: Медицина, 1985. - pp. 299 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru