The coordination behaviour of a variety of amine containing phosphine ligands has been studied. Two new multifunctionalised ligands have been prepared and shown along with three known ligands to favour a variety of coordination modes when complexed with rhodium(III) centres. The hemilabile P∧N chelate ligands show three different types of behaviour: strong P,N chelation even in the presence of chloride ions, strong P,N chelation after a chloride ligand is removed (Ag salts), and weak coordination after chloride abstraction. Five of the complexes have been characterised by X-ray crystallography. Multinuclear NMR and IR spectroscopies were also highly diagnostic in assigning the coordination chemistry favoured by each ligand.
对多种含胺
膦配体的配位行为进行了研究。制备了两种新多功能化
配体,并与三种已知
配体一起展示了它们在与
铑(III)中心配位时偏好的多种配位模式。半可脱离的P∧N螯合
配体表现出三种不同的行为:即使在
氯离子的存在下也表现出强的P,N螯合,去除
氯配体后(
银盐)表现出强的P,N螯合,以及在去除
氯后表现出的弱配位。这五种配合物已通过X射线晶体学进行表征。多核NMR和红外光谱在确定每种
配体偏好的配位
化学方面也具有很高的诊断价值。