Strain in organometallics II: controlling the properties of tetra-coordinated iridium complexes using diastereomers of a bis(tropp) ligand system
作者:Cècile Laporte、Torsten Büttner、Heinz Rüegger、Jens Geier、Hartmut Schönberg、Hansjörg Grützmacher
DOI:10.1016/j.ica.2004.01.034
日期:2004.4
d ]cyclohepten-5-yl)phenylphosphanyl]-propane, bis(tropp Ph )propane, were synthesised. For the binding of transition metals, these ligands offer two olefin moieties and two phosphorus centres and form mixtures of diastereomers with a R , S -configuration at the phosphorus centres ( meso ), or a R , R ( S , S )-configuration ( rac ), respectively. meso / rac -bis(tropp Ph )ethane was separated by fractional
四螯合配体1,2-双[(5H-二苯并[a,d]环庚基-5-基)苯基膦基]乙烷,双(tropp Ph)乙烷和1,3-双[(5H-二苯并[合成了a,d]环庚基-5-基)苯基膦基]丙烷双(tropp Ph)丙烷。为了结合过渡金属,这些配体提供了两个烯烃部分和两个磷中心,并形成了在磷中心(内消旋)具有R,S-构型或R,R(S,S)-构型( rac)。通过分级结晶分离内消旋/ rac -bis(tropp Ph)乙烷,并与[Ir(cod)2] OTf(cod =环十八碳二烯,OTf-= CF 3 SO 3-)反应,得到五配位络合阳离子/ rac-[Ir(bis(tropp Ph)ethane)(cod)] +,其中bis(tropp Ph)乙烷仅用作三齿配体。一个烯烃单元保持未键合,但是,建立了该烯烃与配位烯烃单元之间的缓慢分子内交换(内消旋-[Ir(bis(tropp Ph)乙烷)(cod)]