膦酸根型水溶性膦配体的质子离解和紫外光谱特性  

Determination of dissociation constants of some novel water-soluble phosphine ligands containing phosphonic acid and their ultraviolet property

作　　者：马学兵[1] 傅相锴[2] 李龙芹[2] 程静蓉[2] 

机构地区：[1]四川大学化学学院,四川成都610064 [2]西南师范大学化学化工学院,重庆400715

出　　处：《化学研究与应用》2002年第4期436-438,共3页Chemical Research and Application

基　　金：重庆市科委资助项目

摘　　要：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.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.

关 键 词：膦酸根型 水溶性膦配体 质子离解 离解常数 紫外光谱特性 二苯基膦甲基 两相催化 

分 类 号：O627.51[理学—有机化学] O643.322[理学—化学]