Variable coordination behaviour of pyrazole-containing N,P and N,P(O) ligands towards palladium(ii)
作者:Steven Kealey、Nicholas J. Long、Philip W. Miller、Andrew J. P. White、Peter B. Hitchcock、Antony Gee
DOI:10.1039/b704051b
日期:——
pzphos(O) towards palladium(II) has been investigated. Depending on the ligand to metal molar ratio employed in the reactions of palladium(II) with pzphos, either the 1 : 1 chelate [Pd(pzphos)Cl2] 1a or the 2 : 1 N,P chelate [Pd(pzphos)2]Cl2 1b was obtained. 1b contains two six-membered chelate rings in which the chlorides have been displaced from the inner coordination sphere of palladium. Exchange of
合成了3个基于在一个苯环的邻位带有吡唑基的三苯基膦单元的二齿混合供体配体。N,P配体[2-(3-吡唑基)苯基]二苯基膦膦酸酯已合成并转化为新的N,P(O)和N,P(S)衍生物,[2-(3-吡唑基)苯基]二苯基膦氧化物pzphos(O)和[2-(3-吡唑基)苯基]二苯基膦硫化物pzphos(S)。研究了对膦和对膦对钯(II)的配位化学。取决于钯(II)与pzphos反应中使用的配体与金属的摩尔比,是1:1螯合物[Pd(pzphos)Cl2] 1a还是2:1 N,P螯合物[Pd(pzphos)2]获得Cl 2 1b。1b包含两个六元螯合环,其中的氯化物已从钯的内部配位球中移出。用AgClO4将1b中的氯离子交换为高氯酸根,得到[Pd(pzphos)2] [ClO4] 2 1c。在相同条件下,pzphos(O)的反应会形成2:1加合物[Pd(pzphos(O))2Cl2] 2b,而与金属与配体的