A number of compounds which can by their stoichiometry be classified into several groups have been prepared by reaction of tris(N-piperidinomethyl)phosphine oxide (tppo) with Zn(II) and Cd(II) salts. The structure of two Zn(II) complexes differing by their Zn : tppo ratio and of one Cd(II) complex has been determined by the X-ray diffraction technique. The results show that in all the cases tppo is bound as divalent chelate N,O-donor, but the geometry of coordination sphere of M(II) decisively affects the steric arrangement of the five-membered chelate ring. Structures of the compounds studied are entirely different from those of Zn(II) complexes of sterically less demanding P,P-dimethyl-P-aminomethylphosphine oxide (dmao). On the other hand, the way of coordination of tppo is the same as that found in the case of the Co(II) complex of tris(N,N-dimethylaminomethyl)phosphine oxide.
通过将三(N-哌啶甲基)氧化磷(TPPO)与Zn(II)和Cd(II)盐反应,制备了一些化合物,这些化合物可以根据它们的化学计量比分为几组。通过X射线衍射技术确定了两个Zn(II)配合物的结构,它们的Zn:TPPO比例不同,以及一个Cd(II)配合物的结构。结果表明,在所有情况下,TPPO以二价螯合的N,O-供体结合,但M(II)的配位球的几何结构决定了五元螯合环的立体排列。所研究化合物的结构与空间要求较小的P,P-二甲基-P-氨基甲基氧化磷(DMAO)的Zn(II)配合物的结构完全不同。另一方面,TPPO的配位方式与三(N,N-二甲基氨基甲基)氧化磷的Co(II)配合物中发现的方式相同。