An unusually stable octanuclear σ-mesityl-bridged µ4-oxo-copper(i) complex encapsulated by a pyrazolate-based compartmental ligand scaffold

Abstract

A new compartmental pyrazole-derived chelating ligand, four equivalents of mesitylcopper and stoichiometric amounts of dioxygen lead to the formation of a remarkably stable organometallic framework that can be described as a heteroleptic O-centered cuprate anion [(MesCu^I)₄(µ₄-O)]²⁻ linked via σ-mesityl-bridges to two surrounding binuclear Cu^I-pyrazolate clamps.