configuration. Thermal oxidative additions (TOA) of alkyl halides were performed with both complexes leading, in the case of 5, to a mixture of isomers and, in the case of 6, to isomerically pure products. The predetermination of chirality at the metal center is therefore preserved in the octahedral (OC-6) platinum(IV) complexes. Crystals of Pt(th4,5ppy)(2) (5) are orthorhombic, of space group P2(1)2(1)2(1),
通过使用强烈的空间相互作用的
配体,可以获得在
金属中心具有预定螺旋手性的顺式-双-双亲
铂(II)配合物。为此目的,两个新的
配体,(8R,10R)-2-(2'-
噻吩基)-4,5-松果
吡啶,th4,5ppy(2)和(8R,10R)-2-(2'-
噻吩基)-5,6-pinenopyridine,th5,6ppy(4),已合成并与
铂配位。通过X射线衍射确定所得配合物Pt(th4,5ppy)(2)(5)和Pt(th5,6ppy)(2)(6)的结构,发现它们都在Delta-cis配置。进行烷基卤化物的热氧化加成(
TOA),这两种配合物在5的情况下导致异构体的混合物,在6的情况下导致异构体纯的产物。因此在八面体(OC-6)
铂(IV)配合物中保留了
金属中心手性的预定值。Pt(th4,5ppy)(2)(5)的晶体是正交晶体,空间群P2(1)2(1)2(1),a = 12.973(1)Å,b = 13.619(2)Å,