Coordination Chemistry of Fluorinated Allenes

The synthesis, spectroscopic data, and structure determinations of the allene complexes CpMn(CO)2L
3a−c (a, L = C3H4; b, C3H2F2; c, C3F4) are described.
The analysis of the IR spectroscopic data revealed
increasing acceptor properties on increasing the number
of fluorine substituents, making tetrafluoroallene a better
π-acceptor ligand than CO.

本文报道了丙二烯（allene）配合物CpMn(CO)₂L（3a~c，其中a: L=C₃H₄；b: L=C₃H₂F₂；c: L=C₃F₄）的合成、光谱数据及结构解析结果。该配合物中的Cp为环戊二烯基（cyclopentadienyl），对红外（IR，Infrared Spectroscopy）光谱数据的分析显示，随着氟取代基数量的增加，配合物的受体特性逐步增强，四氟丙二烯是比羰基（carbonyl，CO）更优异的π受体配体。