1 research outputs found
Homoleptic Cyclic Trinuclear d10 Complexes: From Self-Association via Metallophilic and Excimeric Bonding to the Breakage Thereof via Oxidative Addition, Dative Bonding, Quadrupolar and Heterometal Bonding Interactions
Trinuclear coinage metal metallacycles are obtained when two-coordinate metals are
bonded to C, N or N, N anionic ligands of the proper symmetry to form cycles where metals alternate with bridging ligands. Cyclotrimers often exhibit semiplanar structures
and mostly columnar or finite stacking in the solid state by means of metallophilic
interactions. They show some peculiar properties with an impact on many
different fields such as supramolecular architectures, luminescence, molecular recognition,
host-guest chemistry, and acid-base chemistry. The comprehensive evaluation
of the data shows that, depending on the nature of the central metal and bridging
ligand, there is a fine balance of the energy involved in the inter-trimer bond cleavages
and the energy gained from the formation of new intermolecular electrostatic interactions,
proceeding occasionally to the chemical extreme of redox processes. In this
review, a number of important developments are highlighted and systematically analyzed
along with structural and computational data and chemical properties to rationalize
and build a unifying leitmotif for this chemistry; the focus is made on the
authors’ contributions in these areas