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Properties of substance:

dichlorine heptoxide

Group of substances:

inorganic

Physical appearance:

colorless oily liquid

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

Cl2O7

Structural formula as text:

Cl2O7

Molar/atomic mass: 182.9

Melting point (°C):

-90

Boiling point (°C):

80

Decomposition temperature (°C):

80

Solubility (g/100 g of solvent):

benzene: soluble [Ref.]
carbon tetrachloride: miscible (-22°C) [Ref.]
perchloric acid anhydrous: miscible (20°C) [Ref.]
phosphorus(V) trichloride oxide: soluble [Ref.]
water: reaction [Ref.]

Interatomic distances and bond angles:

Interatomic distances (in pm): 142 (O(1)-Cl)
Interatomic distances (in pm): 172,5 (Cl-O(4))
Bond angles (in degrees): 115 (Cl-O(4)-Cl)

Numerical data:

Year of discovery: 1900

Density:

1.967 (-50°C, g/cm3)
1.9 (-20°C, g/cm3)
1.855 (0°C, g/cm3)
1.811 (20°C, g/cm3)
1.8053 (25°C, g/cm3)

Reactions of synthesis:

  1. [Ref.1aster]
    2HClO4 + P2O5 → Cl2O7 + 2HPO3

Reactions:

  1. Yeild 56%. [Ref.1, Ref.2aster]
    C2H5OH + Cl2O7 → C2H5OClO3 + HClO4
  2. Yeild 60%. [Ref.1, Ref.2aster]
    HOCH2CH2OH + 2Cl2O7 → O3ClOCH2CH2OClO3 + 2HClO4
  3. Yeild 83%. [Ref.1]
    (CH2)4O + Cl2O7 → O3ClOCH2CH2CH2CH2OClO3
  4. [Ref.1]
    3H2NCOOC2H5 + Cl2O7 → C2H5OClO3 + [H2NC(OH)OC2H5]ClO4 + H2NCONHCOOC2H5

Vapour pressure (Torr):

1 (-47°C)
10 (-14.6°C)
100 (28.3°C)

Dipole moment (D):

0.72 (20°C)

Viscosity (mPa·s):

0.698 (20°C)
0.867 (0°C)
0.975 (-10°C)

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

251 (l)

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

32.3

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

285 (g)

References:

  1. Advances in Inorganic Chemistry and Radiochemistry. - 1963. - Vol. 5. - pp. 70
  2. Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 265 [Russian]
  3. Никитин И.В. Химия кислородных соединений галогенов. - М.: Наука, 1986. - pp. 78-82 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 109 [Russian]
  5. Реми Г. Курс неорганической химии. - Т.1. - М., 1963. - pp. 862-863 [Russian]
  6. Росоловский В.Я. Химия безводной хлорной кислоты. - М.: Наука, 1966. - pp. 115-129 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru