Ansa-metallocenes with BN and BP linkages: the importance of NH⋯FC hydrogen bonding in pentafluorophenyl boron compounds
作者:Simon J. Lancaster、Andrew J. Mountford、David L. Hughes、Mark Schormann、Manfred Bochmann
DOI:10.1016/s0022-328x(03)00346-2
日期:2003.8
Cp′(CpB)(μ-NHCMe3)ZrCl, with a constrained-geometry type CpBN chelate ligand. The 19F-NMR spectrum of the zirconium complexes, as well as that of the titanium analogue, reveals CF⋯HN hydrogen bonding to one of the ortho-F atoms of a C6F5 ring, strong enough to persist in solution at room temperature. The reaction of Cp′(CpB)TiCl2 with LiPPh2 affords the CpBP chelate complex Cp′(CpB)(μ-PPh2)TiCl, the first
Cp的反应“(CP乙)的ZrCl 2混合[Cp乙=η 5 -C 5 H ^ 4 B(C 6 ˚F 5)2 ]与LiNHCMe 3,得到CP'(CP乙)(μ-NHCMe 3)的ZrCl,与几何形状受限的CpBN螯合物。锆配合物以及钛类似物的19 F-NMR光谱显示CF⋯HN氢键与C 6 F 5环的邻位-F原子之一结合,强度足以持久在室温下溶解。Cp'(Cp B)TiCl的反应2与LiPPh 2次,得到CpBP螯合物CP'(CP乙)(μ-PPH 2)的TiCl,一个晶体学表征的Ti(IV)化合物膦的第一个例子。甲19数目B的加合物中的F-NMR研究(C 6 ˚F 5)3与整洁-和仲-胺演示分子内氢键至C的重要性6 ˚F 5在这类化合物中,而没有这样的B(C 6 F 5)3(PHR 2)(R = Cy,Ph)中的相互作用。Cp'(Cp的晶体结构乙)(μ-PPH 2)的TiCl,B(C