Solubilizing the most easily ionized molecules and generating powerful reducing agents

Area of Science:

• Inorganic Chemistry
• Organometallic Chemistry
• Electrochemistry

Background:

• Guanidinate ligands are known to stabilize metal-metal bonds.
• Paddlewheel structures are common motifs in dinuclear metal complexes.
• Tuning redox properties is crucial for developing new reducing agents.

Purpose of the Study:

• To synthesize and characterize novel W2 compounds with bicyclic guanidinate ligands.
• To investigate the electronic and redox properties of these W2 compounds.
• To evaluate their potential as stoichiometric reducing agents.

Main Methods:

• Synthesis of W2(bicyclic guanidinate)4 compounds.
• Electrochemical measurements (cyclic voltammetry) in THF.
• Density Functional Theory (DFT) computations.

Main Results:

• Compounds exhibit record low ionization energies (3.4-3.5 eV).
• Observed very negative oxidation potentials in THF (-1.84 to -1.90 V vs Ag/AgCl).
• DFT calculations correlate gas-phase ionization energies with solution redox potentials and chemical behavior.

Conclusions:

• The synthesized W2 compounds are thermally stable and readily prepared in high yield and purity.
• These compounds are highly reactive and demonstrate potential as stoichiometric reducing agents.
• Their utility is suggested for nonpolar, nonprotonated solvent systems.