A Corannulene-based Metallobox for the Encapsulation of Fullerenes

Overview

Journal Chem Sci

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2024 Aug 26

PMID 39183911

Authors

Susana Ibanez

Carmen Mejuto

Katherin Ceron

Pablo J Sanz Miguel

Eduardo Peris

Affiliations

Soon will be listed here.

Abstract

A corannulene-bis-N-imidazolium salt was used for the synthesis of two corannulene-bis-N-heterocyclic carbenes of dirhodium(i) complexes of formula (corannulene-di-NHC)[RhCl(COD)] and (corannulene-di-NHC)[RhCl(CO)]. Both complexes were characterized by spectroscopic techniques, and the electron-donating properties of the corannulene-di-NHC ligand were studied by means of infrared spectroscopy and cyclic voltammetry. The complex (corannulene-di-NHC)[RhCl(COD)] was used for the encapsulation of fullerenes C and C, generating host-guest complexes with 2 : 1 stoichiometry, as evidenced by H NMR and ITC titrations. Then, a tetra-rhodium(i) metallo-rectangle supported by two corannulene-bis-imidazolylidene ligands and two cofacial 4,4'-bipyridine ligands was prepared and characterized. This metallobox is capable of quantitatively encapsulating fullerenes C and C, forming complexes that are highly stable even at high temperatures. The molecular structure of the metallobox with encapsulated C reveals a perfect size and shape complementarity that benefits from the concave-convex π-π interaction between the polyaromatic surfaces of the host and the guest.

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