complexes can be protonated with the strong acid TfOH in CH2Cl2 to form cationic complexes having a μ-H bridge between the two iron centers. The parent hexacarbonyl complex 3 could act as a proton reduction catalyst at −2.0 V in the presence of TsOH as the proton source in CH2Cl2. When protonated complexes having MeCN or phosphine ligands were used, the proton reduction potentials catalyzed by these complexes
所述的P-P键的顺式- 1个
配体(μ-顺式- 1)的[Fe(CO)4 ] 2(顺式- 1 =
萘-1,8- diphenyldiphosphine)通过CO解离后在两个
铁中心切割从
铁中心,尽管所P-P键的顺式- 1是立体
化学与鲁棒
萘基团稳定化,不象通常的
二膦,缺乏这样的支持。将得到的(μ-nabip)的[Fe(CO)3 ] 2(3 ; nabip =
萘-1,8-二(phenylphosphido))具有由bisphosphido桥连接的二
铁芯。由于反式异构体(μ-反式- 1)的[Fe(CO)4 ] 2是在环境条件下稳定,顺两个的Fe(CO)的配置4个片段负责用于P-P键的断裂。的一个或两个终端CO
配体3即PME:可以通过的MeCN和一系列膦配位体来代替3,PPH 3,顺式- 1,和反式- 1。有趣的是,人们发现,
二膦顺- 1可以协调
铁中心在一个不寻常κ 2形成三元环,这已通过NMR光谱和X射