X-ray diffraction study. In the anion a very short W–Fe bond [2.512(2)Å] is bridged by the xylylmethylidyne ligand [µ-C–W 2.02(1), µ-C–Fe 1.82(1)Å]. Both metal centres carry two terminally bound CO groups. As expected, the tungsten atom is ligated by the six atoms in the open face of the carbaborane cage, but the latter also bridges the W–Fe linkage via an exopolyhedral B–H⇀Fe three-centre two-electron
将盐Na 2 [C 2 B 10 H 10 Me 2 ]的
四氢呋喃溶液加到化合物[W(CR)Cl(CO)2 L 2 ](R = C 6 H 4 Me- 4或C 6 H 3 Me 2 -2,6; L =
吡啶或4-
甲基吡啶),在[NEt 4 ] Cl存在下,提供配合物[NEt 4 ] [W(CR)(CO)2(η 6 -C 2 B 10 H 10 Me 2)]。一个R = C 6 H 3 Me 2 -2,6的产物的X射线衍射研究表明,
钨原子由两个CO基团连接:亚烷基片段[W C 1.84(1)Å]和碳
硼烷笼。后者的开口面是η 6 -CO-统筹到
钨但是断然是非平面的。在五个
硼原子的五边形带上方需要有六个原子的原子环,导致笼中的两个面从三角形排列变形为基本上正方形。可变温度核磁共振研究表明,阴离子在溶液中经历了动态交换过程。盐的治疗[净4 ] [W(CR)(CO)2(η 6 -C2 B 10 H 10