Bisphosphine based hetero-capsules for the encapsulation of transition metals

Abstract

Just mixing of solutions of tetracationic diphosphine ligands and tetraanionic calix[4]arene building blocks leads to the formation of supramolecular heterocapsules that coordinate a palladium metal within the cavity of the assembly, giving rise to a new class of potential supramolecular transition metal catalysts.

Chemistry in Self‐Assembled Nanoreactors

“…54 This example involves a concave shaped bifunctional diphosphine ligand which can complexate a transition metal and also contains functional groups for capsule formation. Self -assembly of the tetracationic diphosphine ligand with a tetraanionic calix [4]arene leads to the formation of a reversible heterocapsule based on ionic interactions ( H ).…”

Selective Oxidation of Alcohols Catalyzed by a Hemicryptophane-Ruthenium Complex

“…Therefore, discoveries of new classes of synthetic transition metal complexes containing well-defined cavities that are analogous to the active sites of metalloenzymes have been of great interest for improving the reactivity and selectivity of bulk phase reactions [4][5][6][7][8][9][10][11][12][13][14]. Hemicryptophanes are covalent molecular capsules constructed from a cyclotriveratrylene (CTV) host unit and they are responsible for dissymmetry at the molecular cavity level [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Regioselectivity with Hemispherical Chelators: Increasing the Catalytic Efficiency of Complexes of Diphosphanes with Large Bite Angles

“…[1][2][3] The environment of a bound substrate can be closely controlled by confinement of the metal center, in particular enabling a catalytic reaction to be driven towards the product that best adapts to the steric restraints imposed by the confining structure. Although these and other effects of coordination are seen to operate ubiquitously in biology, their transposition to catalytic systems of industrial relevance still remains limited.…”