The phosphine derivatives, R2R P or R3P (where R = aryl or substituted aryl group and R = alkyl or alkoxy group) form 1:1 and 1:2 adducts with iodine. The stoichiometries of these adducts depend upon the molar ratios of the reactants. In carbon tetrachloride solutions, these adducts are present as "ion pairs". The tetraiodides are comparatively unstable and change into the more stable diiodides with time. The nature of the adducts and changes in the electronic spectra are discussed.


A MOHAMMAD ,O H AMIN ,A AUGHUSTEEN ,