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Properties of substance:

1,3,5-triazine-2,4,6-triamine

Synonyms:

melamine

Group of substances:

organic

Physical appearance:

colorless monoclinic crystals

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

C3H6N6

Structural formula as text:

C3N3(NH2)3

Molar/atomic mass: 126.12

Melting point (°C):

354

Decomposition temperature (°C):

354

Solubility (g/100 g of solvent):

ammonia liquid : slightly soluble 3.48 (14.5°C) [Ref.]
ammonia liquid : 1 (134°C) [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: soluble (78°C) [Ref.]
organic solvents: insoluble [Ref.]
water: 0.5 (20°C) [Ref.]
water: 4 (90°C) [Ref.]

Numerical data:

Year of discovery: 1834

Density:

1.571 (20°C, g/cm3)

Index of refraction:

1.872 (20°C)

    Dissociation:

    pKBH+ (1) = 6.47 (25°C, water)
    pKBH+ (2) = 0.37 (25°C, water)
    pKBH+ (3) = -2.83 (25°C, water)

    Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

    -64.3 (s)

    Heat of combustion (kJ/mol):

    1976.2

    References:

    1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 3-516
    2. Russian Journal of Coordination Chemistry. - 2002. - Vol. 28, No. 5. - pp. 303-304
    3. Smolin E.M., Rapoport L. s-Trizines and derivatives. - New York: Interscience Publishers Inc., 1959. - pp. 309-349
    4. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 61
    5. Вирпша З., Бжезиньский Я. Аминопласты. - М.: Химия, 1973. - pp. 21-27 [Russian]
    6. Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.2. - Л.: Химия, 1976. - pp. 479-480 [Russian]
    7. Грушко Я.М. Вредные органические соединения в промышленных сточных водах. - 2 изд. - Л.: Химия, 1982. - pp. 107 [Russian]
    8. Краткая химическая энциклопедия. - Т. 3: Мальтаза-Пиролиз. - М.: Советская энциклопедия, 1964. - pp. 108-109 [Russian]
    9. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 159 [Russian]
    10. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 390 [Russian]
    11. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 776-777 [Russian]
    12. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 21 [Russian]
    13. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советсткая энциклопедия, 1983. - pp. 319 [Russian]
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru