been characterized by means of single crystal X-ray diffraction studies and shown to be homobimetallic, with cyclic dimeric structures. Each ligand bridges two metal centers via P coordination to one and η5-coordination of the cyclopentadienyl moiety to a second Ni2+. Each nickel atom is thus formally five-coordinate with average bonding parameters of Ni–Centroid (Cp), Ni–P, and Ni–X of 1.760(5), 2.154(5)
diphenylphosphinylcyclopentadienylthallium(反应1)与NIBR 2 ·2
DME已产生的Ni 2(η 5 -C 5 H ^ 4 PPH 2)2
溴2(2)以定量产率。的反应2用
甲基锂得到的Ni 2(η 5 -C 5 H ^ 4 PPH 2)2(CH 3)2(3)以高收率。两个2 ·0.5CH 2
氯2和3已经被表征通过单晶X射线衍射研究的手段和显示是homobimetallic,与环二聚结构。各
配体桥接通过P协调两个
金属中心的一个和η 5
环戊二烯基部分与一个第二Ni的-coordination 2+。因此,每个
镍原子的形式为五坐标,其平均Ni-Centroid(Cp),Ni-P和Ni-X的平均键合参数分别为1.760(5),2.154(5),Br:2.301(8)Å(2)和1.769(5),2.113(5),CH 3:1.944(1)Å(3)。P–Ni