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
A more convenient and economic method has been developed for synthesizing bis (4 bromophenyl)phosphine oxide in a high yield, which was introduced to prepare three water soluble phosphine precursors successfully. All ...A more convenient and economic method has been developed for synthesizing bis (4 bromophenyl)phosphine oxide in a high yield, which was introduced to prepare three water soluble phosphine precursors successfully. All new compounds were fully characterized by IR, 1H NMR, 13 C NMR , 31 P NMR , MALDI TOFMS and elemental analyses.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.
文摘A more convenient and economic method has been developed for synthesizing bis (4 bromophenyl)phosphine oxide in a high yield, which was introduced to prepare three water soluble phosphine precursors successfully. All new compounds were fully characterized by IR, 1H NMR, 13 C NMR , 31 P NMR , MALDI TOFMS and elemental analyses.
