Thermodynamic properties of phosphorus-containing molecules

Syntheses, properties and reactions of some phosphorus compounds have been reviewed briefly.The thermochemistry and infrared spectra of phosphoryl halide - boron halide complexes have been reported.. The phosphoryl chloride - boron trichloride complex has been studied by a vapour tensimetric method and the derived thermodynamic data compared with that obtained directly by calorimetry.The thermochemistry of phosphorus trihalide - boron trihalide complexes has been reported and the nature of donor acceptor bond is discussed.The standard enthalpy of formation of diphosphorus tetraiodide has been determined followed by the estimation of P - P bond strength. A new value for the standard enthalpy of formation of phosphorous acid has been reported The phosphorus (V) chloride - boron trichloride complex has been studied both thermochemically and vapour tensi-metrically.The standard heats of hydrolysis of phenyl phosphorus dihalides and diphenyl phosphorus halides have been measured. The heat of solution of phenyl phosphonous acid has been determined. Infrared spectra of halo phosphines including the far infrared spectra of phenyl phosphorus dibromide and dipheynl phosphorus bromide have been recorded. The existence of phenyl phosphorus mixed halide has beeninvestigated by 31 magnetic resonance.