Chemical transformations supported by the [Re6(μ3-Se)8]2+ cluster core

Area of Science:

• Inorganic Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Octahedral rhenium-selenium clusters offer unique reactivity due to their electronic structure.
• Transition metal clusters are promising for catalysis and materials applications.

Purpose of the Study:

• To investigate novel chemical transformations of the [Re(6)(μ(3)-Se)(8)](2+) cluster core.
• To explore the synthesis and reactivity of imino ester, imine, and carbonyl complexes.
• To evaluate the stability and catalytic potential of these new cluster complexes.

Main Methods:

• Nucleophilic addition of alcohols to cluster-bound nitriles.
• Reaction of cluster nitrile solvates with organic azides.
• Synthesis and characterization of cluster carbonyl complexes.
• Experimental and computational studies of electronic structure and bonding.
• Evaluation of thermal, photochemical stability, and reactivity studies.

Main Results:

• Z-configured cluster-imino ester complexes were predominantly formed via nucleophilic attack by alcohols, with a proposed mechanism involving hydrogen bonding.
• Cluster-imine complexes were synthesized with geometric specificity through reaction with organic azides, likely via intermediate cluster-azide complexes.
• Novel cluster carbonyl complexes were synthesized, exhibiting significant back-bonding interactions, and their stability and reactivity were assessed.

Conclusions:

• The [Re(6)(μ(3)-Se)(8)](2+) cluster core effectively promotes diverse chemical transformations of its ligands.
• These reactions provide access to new classes of rhenium-selenium cluster complexes with tunable properties.
• The findings suggest a promising new direction for developing solid-state type transition metal cluster chemistry and catalysis.