title: Bis(metallo) capsules based on two ionic diphosphines.
abstract: Self-assembly and characterization of heterodimeric diphosphine capsules formed by multiple ionic interactions are described. The first type of capsules is composed of one novel tetrasulfonato-xantphos ligand and one complementary tetraammonium calix[4]arene. Encapsulation of a transition metal is achieved by self-assembly of a rhodium complex containing the tetraanionic diphosphine ligand and a tetracationic calix[4]arene. The second type of capsules is composed of two oppositely charged diphosphine ligands: one tetrasulfonato-xantphos and one tetraammonium-diphosphine (of the xantphos-, DPEphos-, and 1,2-bis(diphenylphosphino)ethane (dppe)-type). Bis(metallo) capsules, that is, simultaneous encapsulation of two different transition metals, are created by self-assembly of a palladium or platinum complex containing a tetracationic ligand and a rhodium complex containing a tetraanionic ligand. Diphosphine ligands with different flexibilities and shapes assemble into metallocapsules with a proper capsular structure, as is indicated by (1)H NMR and 1D-NOESY spectroscopy, ESIMS, and modeling studies.
authors: Homogeneous and Supramolecular Catalysis, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Postbox 94720, 1090 GS Amsterdam, The Netherlands.
authors: Tehila S
authors: TS
authors: Koblenz
authors: Henk L
authors: HL
authors: Dekker
authors: Chris G
authors: CG
authors: de Koster
authors: Piet W N M
authors: PW
authors: van Leeuwen
authors: Joost N H
authors: JN
authors: Reek
mesh_terms: D047250:Calixarenes / Q000737:chemistry; D002214:Capsules / Q000737:chemistry*; D008024:Ligands; D010165:Palladium / Q000737:chemistry; D010636:Phenols / Q000737:chemistry; D010720:Phosphines / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry; D012238:Rhodium / Q000737:chemistry; D028561:Transition Elements / Q000737:chemistry*
chemical_list: D002214:Capsules; D008024:Ligands; D010636:Phenols; D010720:Phosphines; D028561:Transition Elements; C121325:calix(4)arene; D047250:Calixarenes; D010984:Platinum; D010165:Palladium; D012238:Rhodium; C044646:phosphine