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Properties of substance:

diborane(6)

Group of substances:

inorganic

Physical appearance:

colorless gas

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

H6B2

Structural formula as text:

B2H6

Molar/atomic mass: 27.67

Melting point (°C):

-165

Boiling point (°C):

-92.5

CAS №: 19287-45-7


Solubility (g/100 g of solvent):

carbon disulphide: soluble [Ref.]
diethyl ether: 1.1 (25°C) [Ref.]
tetrahydrofuran: 8.1 (25°C) [Ref.]
water: reaction [Ref.]

Numerical data:

Year of discovery: 1912
Interatomic distances (in pm): 133.9
Interatomic distances (in pm): 177.5
Interatomic distances (in pm): 119.6
Bond angles (in degrees): 97
Bond angles (in degrees): 119.9

Density:

0.557 (-183°C, g/cm3)
0.447 (-112°C, g/cm3)
0.001214 (25°C, g/cm3)

Reactions:

  1. Yeild 61%. [Ref.1]
    6(CH2CH2)2O + B2H6 → 2(CH3CH2CH2CH2O)3B
  2. [Ref.1]
    NaCN + B2H6 + O(CH2CH2)2O → NaBH3CNBH3 * O(CH2CH2)2O
  3. [Ref.1]
    2NaHg + 2B2H6 → NaBH4 + NaB3H8 + 2Hg
  4. [Ref.1]
    B2H6 + 2(CH3)2SO → (((CH3)2SO)2BH2)[BH4]
  5. [Ref.1]
    B2H6 + 2NH3 → ((NH3)2BH2)[BH4]

Vapour pressure (Torr):

10 (-146°C)
100 (-122°C)

Dipole moment (D):

0 (20°C)

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

38.5 (g)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

89.6 (g)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

232 (g)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

56.9 (g)

Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

4.47

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

13.3

Critical temperature (°C):

16.7

Critical pressure (MPa):

4

Critical density (g/cm3):

0.14

References:

  1. Bell C.F. Syntheses and Physical Studies of Inorganic Compounds. - Pergamon Press, 1972. - pp. 1-15
  2. Bretherick's Handbook of Reactive Chemical Hazards. - 6 ed., Vol. 1. - Butterworth-Heinemann, 1999. - pp. 73-74
  3. Dean J.A. Lange's handbook of chemistry. - 1999. - pp. 3.20
  4. Gangolli S. The Dictionary of Substances and their Effects. - 2 ed., Vol. 3, D. - RSC, 1999. - pp. 180
  5. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 161-164 [Russian]
  6. Девятых Г.Г., Зорин А.Д. Летучие неорганические гидриды особой чистоты. - М.: Наука, 1974 [Russian]
  7. Жигач А.Ф., Стасиневич Д.С. Химия гидридов. - Л.: Химия, 1969. - pp. 138-199 [Russian]
  8. Михайлов В.А. Химия бороводородов. - М.: Наука, 1967. - pp. 13-49 [Russian]
  9. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 20-22 [Russian]
  10. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 57 [Russian]
  11. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 38-39 [Russian]
  12. Успехи химии. - 1962. - Т.31, №4. - pp. 417-451 [Russian]
  13. Физер Л., Физер М. Реагенты для органического синтеза. - Т. 1: А-Е. - М., 1970. - pp. 258-268 [Russian]
  14. Хайош А. Комплексные гидриды в органической химии. - Л.: Химия, 1971. - pp. 28-36 [Russian]
  15. Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 307 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru