WebElements Periodic Table of the Elements | Phosphorus

Phosphorus compounds: tetraphosphorus heptasulphide

The phosphorus in tetraphosphorus heptasulphide formally is in the oxidation state .

Tetraphosphorus heptasulphide

Formula as often written: P₄S₇
Hill system formula: P₄S₇
CAS registry number: [15578-16-2]
Formula weight: 348.357
Class: sulphide

Synonyms

tetraphosphorus heptasulphide
phosphorus heptasulphide
phosphorus heptasulfide
phosphorus sulfide
phosphorus sulphide
tetraphosphorus heptasulfide

Physical properties

Colour: very pale yellow
Appearance: crystalline solid
Melting point: 308°C
Boiling point: 523°C
Density: 2190 kg m^-3

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Element analysis

Element percentages for the elements in tetraphosphorus heptasulphide
Element	%
P	35.57
S	64.43

Synthesis

Not available

Solid state structure

Geometry of phosphorus: mixed 3-, 4-coordinate: pyramidal and tetrahedral
Prototypical structure:

Crystal structure of tetraphosphorus heptasulphide

Isotope pattern

What follows is the calculated isotope pattern for the P₄S₇ unit with the most intense ion set to 100%.

Formula: P₄S₇

mass  %
348 100.0 __________________________________________________
349   5.5 ___
350  31.1 ________________
351   1.5 _
352   4.3 __
353   0.2 
354   0.3 
355   0.0 
356   0.0

References

The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.

R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.