New values for the standard heats of formation of phosphorus tri-iodide and diphosphorus tetraiodide [ΔHf°(c)=–59·3 ± 2·5; –113·1 ± 5·0 kJ mole–1 respectively] are reported. The mean bond dissociation energy ![[D with combining overline]](https://www.rsc.org/images/entities/i_char_0044_0305.gif)
P – I is calculated to be 210 kJ mole–1, and the bond energy EP – P= 232 kJ mole–1.
A. Finch, P. J. Gardner and K. K. SenGupta, J. Chem. Soc. A, 1969, 2958 DOI: 10.1039/J19690002958
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