DIPOLE MOMENTS OF SOME PHENYL AND CHLOROPHENYL PHOSPHORUS-HALOGEN COMPOUNDS

The electric dipole moments of o-ClC 6 H 4 PCl 2 1, C 6 H 5 PF 4 2, o-ClC 6 H 4 PF 4 3, C 6 H 5 P(O)F 2 4, C 6 H 5 P(O)HF 5. C 6 H 5 P(O)H(OH) 6, and o-ClC 6 H 4 P(O)Cl 2 7, were determined in dilute benzene solution at 25°C. The phosphoryl bond moment PO in compounds 4, 5, and 7 was estimated using simple bond-additivity calculations. The results obtained were 4.55D, 3.64D, and 5.52D for compounds 4, 5, and 7, respectively. Dipole moments for compounds 2 and 3 were also calculated theoretically using INDO MO techniques. The calculated values differed from the experimental values by about 12%.