New phosphorous-nitrogen compounds 2,3-F2—C6H3C(O)NHP(O)[N(CH3)CH2C6H5]2 (I), C6H5OP(O)[NHCH(CH3)2]2 (II) and (CH3O)2P(S)[NHC6H4NH]P(S)(OCH3)2 (III) were synthesized and characterized by 19F NMR for (I) and 1H, 13C, 31P NMR and IR and mass...