The proton dissociation constants of some novel water soluble phosphine ligands containing phosphonic acid were determined pH metrically at 25℃ and at an inonic strength of 0.1mol·L -1 (KNO 3).From these data it...The proton dissociation constants of some novel water soluble phosphine ligands containing phosphonic acid were determined pH metrically at 25℃ and at an inonic strength of 0.1mol·L -1 (KNO 3).From these data it had been established that when the complexing group PPh 2 was introdued,the proton dissociating power of phosphonic acid significantly increased and the p K 1,p K 2 values were 1.35～1.75 log units smaller than those of the corresponding 2 aminoethylphosphonic acid analogues;while ertheric linkenge was introdued into the corresponding phosphonic acid,the proton dissociating ability of NH + 3, PO 3H - groups decreased and that of PO 3H 2 group increased respectively;However,as hydroxyethyl group was introduced,all proton dissociating power of NH + 3, PO 3H - and PO 3H 2 groups decreased.The ultraviolet properties of this type of phosphine complexes were also determinated.展开更多
文摘The proton dissociation constants of some novel water soluble phosphine ligands containing phosphonic acid were determined pH metrically at 25℃ and at an inonic strength of 0.1mol·L -1 (KNO 3).From these data it had been established that when the complexing group PPh 2 was introdued,the proton dissociating power of phosphonic acid significantly increased and the p K 1,p K 2 values were 1.35～1.75 log units smaller than those of the corresponding 2 aminoethylphosphonic acid analogues;while ertheric linkenge was introdued into the corresponding phosphonic acid,the proton dissociating ability of NH + 3, PO 3H - groups decreased and that of PO 3H 2 group increased respectively;However,as hydroxyethyl group was introduced,all proton dissociating power of NH + 3, PO 3H - and PO 3H 2 groups decreased.The ultraviolet properties of this type of phosphine complexes were also determinated.
基金This work was supported by the State Key L ab.OSSO( Oxo Synthesis and Selective Oxidation) of Lanzhou Institute ofChemical PhysicsThe Chinese Academy of Sciences
