Transition Metal Complexes Coordinated by Water Soluble Phosphane Ligands: How Cyclodextrins Can Alter the Coordination Sphere?

• Published in: Molecules (Basel, Switzerland) Vol. 22; no. 1; p. 140
• Main Authors: Ferreira, Michel, Bricout, Hervé, Tilloy, Sébastien, Monflier, Eric
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01.01.2017; MDPI
• Subjects: beta-Cyclodextrins - chemistry; Cadmium; Catalysis; Chemical Sciences; Coordination Complexes - chemistry; cyclodextrin; Cyclodextrins; Expulsion; hydrosoluble organometallic complexes; Ligands; Magnetic Resonance Spectroscopy; Metal complexes; Molecular Structure; NMR; NMR spectroscopy; Nuclear magnetic resonance; Organometallic complexes; Organophosphorus Compounds - chemistry; Palladium; Palladium - chemistry; Phosphines - chemistry; Platinum; Platinum - chemistry; Steric hindrance; Sulfonic Acids - chemistry; supramolecular chemistry; TPPTS; Transition Elements - chemistry; Transition metal compounds; Water; β-Cyclodextrin; hydrosoluble organometallic complexes; palladium; platinum; supramolecular chemistry; TPPTS; cyclodextrin
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules22010140

The behaviour of platinum(II) and palladium(0) complexes coordinated by various hydrosoluble monodentate phosphane ligands has been investigated by P{¹H} NMR spectroscopy in the presence of randomly methylated β-cyclodextrin (RAME-β-CD). This molecular receptor can have no impact on the organometallic complexes, induce the formation of phosphane low-coordinated complexes or form coordination second sphere species. These three behaviours are under thermodynamic control and are governed not only by the affinity of RAME-β-CD for the phosphane but also by the phosphane stereoelectronic properties. When observed, the low-coordinated complexes may be formed either via a preliminary decoordination of the phosphane followed by a complexation of the free ligand by the CD or via the generation of organometallic species complexed by CD which then lead to expulsion of ligands to decrease their internal steric hindrance.