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Stable Luminescent [Cu(NN)(PP)]+ Complexes Incorporating a β-Cyclodextrin-Based Diphosphane Ligand with
Tuan-Anh Phan1,2, Nicola Armaroli3, Alejandra Saavedra Moncada3
1Équipe Confinement Moléculaire et Catalyse, Université de Strasbourg, Institut de Chimie de Strasbourg, UMR 7177 CNRS, 4 rue Blaise Pascal, CS90032, 67081, Strasbourg Cedex, France.
Abstract:
A β-cyclodextrin-based diphosphane with metal-confining properties was efficiently synthesized thanks to an unprecedented Smiles-like rearrangement of diphenyl-(2-phosphanylphenyl)phosphane in the presence of excess n-BuLi. The cis-chelating bidentate ligand is capable of forming very stable heteroleptic [Cu(NN)(PP)]+ complexes in which a metal-bound diimine ligand (bpy, phen, or mmp) is located within the cyclodextrin cavity. As a result of ligand encapsulation, flattening of the metal tetrahedral geometry in the excited state is disfavored, thereby resulting in enhanced luminescent properties.
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