A highly emissive Cu2N2 diamond core complex supported by a [PNP]- ligand

Area of Science:

• Coordination Chemistry
• Photophysics
• Materials Science

Background:

• Development of luminescent materials with long-lived excited states is crucial for advanced applications.
• Copper complexes offer tunable electronic properties and potential for redox catalysis.
• Ligand design plays a key role in stabilizing reactive metal centers and influencing photophysical properties.

Purpose of the Study:

• To synthesize and characterize a novel Cu2N2 diamond core complex.
• To investigate the photophysical properties, including luminescence and excited-state lifetime.
• To explore the potential of this bimetallic copper system in photochemically driven redox transformations.

Main Methods:

• Synthesis of the {(PNP)CuI}2 complex supported by the [PNP]- ligand.
• Photophysical characterization, including emission spectroscopy and lifetime measurements.
• Electrochemical studies to determine redox potentials and reversibility.

Main Results:

• Successful preparation of the Cu2N2 diamond core structure, {(PNP)CuI}2.
• The complex exhibits high emission intensity at room temperature in solid and solution states.
• Characterized by a long excited-state lifetime (> 10 μs) and high quantum yield (> 0.65).
• Estimated excited-state reduction potential of *2 is approximately -3.2 V vs Fc+/Fc.
• Two reversible ground-state redox processes were observed.

Conclusions:

• The observed photophysical properties are attributed to minimal structural reorganization and significant steric protection by the [PNP]- ligand.
• The bimetallic copper system demonstrates promising characteristics for photoredox catalysis.
• These findings suggest potential applications in driving multielectron redox transformations.