Synthesis and structure of the helicate (M)-(-)-[Pt-2{(R,R)-tetraphos}(2)] (CF3SO3)(4)center dot 4.5 H2O

Kitto HJ; Rae AD; Willis AC; Zank J; Wild SB

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Synthesis and structure of the helicate (M)-(-)-[Pt-2{(R,R)-tetraphos}(2)] (CF3SO3)(4)center dot 4.5 H2O

机译：螺旋（M）-（-）-[Pt-2 {（R，R）-tetraphos}（2）]（CF3SO3）（4）中心点4.5 H2O的合成与结构

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The complex (M)-(-)-[Pt-2{(R,R)-tetraphos}(2)](CF3SO3)(4) . 4.5 H2O, where tetraphos = 1,1,4,7, 10,10-hexaphenyl-1,4,7,10-tetraphosphadecane, has been isolated and structurally characterized. The compound crystallizes in the space group C2 with two crystallographically different, but very similar, cations in the structure, each of which contains a 2-fold axis coincident with the crystallographic 2-fold axis. Each independent cation of the salt consists of a double-stranded, diplatinum(II) helicate that completes a ca. one-eighth turn of a double alpha-helix in the M direction, as evidenced by the angle between the two, non-orthogonal PtP4 square planes in each of the independent molecules. A feature of the structures is the 10-membered ring containing the two platinum atoms and the four chiral phosphorus stereocentres of R configuration; this ring has a distorted twist-boat-chair-boat conformation of lambda helicity, which is responsible for the M twist of the helicate.

机译：配合物（M）-（-）-[Pt-2 {（R，R）-tetraphos}（2）]（CF3SO3）（4）。已分离出4.5 H2O，其中四phos = 1,1,4,7,10,10-六苯基-1,4,7,10-四磷金刚烷并对其结构进行了表征。该化合物在空间群C2中结晶，具有两个晶体学上不同但非常相似的阳离子，结构中的每个阳离子都包含一个与晶体学2倍轴重合的2倍轴。盐的每个独立阳离子都由一个双链双铂（II）螺旋结构组成，该螺旋结构完成一个ca。每个M方向上的双α螺旋的八分之一转，由每个独立分子中两个非正交的PtP4正方形平面之间的角度证明。该结构的特征是含有两个铂原子和四个R构型的手性磷立体中心的10元环。此环具有扭曲的lambda螺旋形扭曲-椅子-椅子-构型，这是导致螺旋形扭曲M的原因。

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《Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences》 |2004年第12期|共4页
作者
Kitto HJ; Rae AD; Willis AC; Zank J; Wild SB;
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正文语种 eng
中图分类化学;
关键词
platinum complex; tetraphosphine; helicate; COMPLEXES; PHOSPHINE);

机译：铂络合物;四膦;螺旋;复合物;膦）;

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Synthesis and structure of the helicate (M)-(-)-[Pt-2{(R,R)-tetraphos}(2)] (CF3SO3)(4)center dot 4.5 H2O

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