Metal-Carbodithioate-Based 3D Semiconducting Metal-Organic Framework: Porous Optoelectronic Material for Energy...

Area of Science:

• Materials Science
• Chemistry
• Energy Conversion

Background:

• Efficient solar energy conversion demands materials that balance photoinduced charge generation with effective charge delivery.
• Achieving high charge conductivity often compromises the optical band gap, necessitating new molecular designs.
• Metal-organic frameworks (MOFs) offer tunable porosity and electronic properties for energy applications.

Purpose of the Study:

• To develop a novel semiconducting metal-organic framework (MOF) with enhanced electronic communication for solar energy conversion.
• To investigate the structural, electronic, and electrochemical properties of the new MOF material.
• To assess the potential of the MOF as an electrocatalyst and photoelectrocatalyst.

Main Methods:

• Synthesis of a semiconducting MOF (Spiro-CS2Ni) utilizing metal-carbodithioate linkage chemistry.
• Characterization using total scattering experiments and reverse Monte Carlo simulations.
• Electrochemical measurements and transient-absorption spectroscopy to evaluate electronic and photophysical properties.
• Assessment of material stability across a wide pH range and under electrochemical conditions.

Main Results:

• A stable, semiconducting 3D-porous MOF, Spiro-CS2Ni, was successfully synthesized with enhanced metal-linker electronic communication.
• The MOF exhibits a band gap of 1.57 eV and a long-lived charge-transfer state (6.5 μs).
• Spiro-CS2Ni demonstrates excellent stability in a broad pH range (1-12) and under electrochemical/photoelectrochemical conditions.

Conclusions:

• The developed metal-carbodithioate MOF provides a promising platform for light-energy conversion materials.
• The material's tunable electronic properties and stability make it suitable for electrocatalytic and photoelectrocatalytic applications.
• This work offers crucial design principles for creating low-density, porous materials for solar energy conversion.