Photoinduced Charge Separation within Metallo-supramolecular Wires Built around a [Ru(bpy)3](2+)-Bisterpyridine...

Area of Science:

• Coordination Chemistry
• Materials Science
• Photochemistry

Background:

• Development of photosensitive molecular wires is crucial for advanced electronic applications.
• Bridging ligands play a key role in mediating electronic interactions between metal centers.

Purpose of the Study:

• To synthesize and characterize a novel ruthenium complex (L1) with terpyridine groups.
• To construct and investigate a bimetallic coordination polymer and an inorganic triad based on L1.
• To evaluate the photosensitive properties and photocurrent generation of these molecular assemblies.

Main Methods:

• Synthesis and characterization of the L1 complex.
• Electrochemical synthesis and characterization of the bimetallic polymer on ITO electrodes.
• Construction and surface anchoring of the inorganic triad on ITO and SiO2.
• Cyclic voltammetry, emission lifetime measurements, and photocurrent measurements.

Main Results:

• The bimetallic polymer [{Ru(II_)Fe(II)}n](4n+) exhibits excited-state interactions between metal centers and generates photocurrent as a photocathode.
• The inorganic triad [Co(III_)Ru(II_)Fe(II)](7+) generates a stable anodic photocurrent, enhanced by 30% compared to previous designs.
• AFM confirmed the linear, upward orientation of the triad on surfaces.

Conclusions:

• The rigid, linear phenylene bridges in L1 facilitate efficient photoinduced charge transfer.
• The synthesized molecular wires demonstrate promising potential for applications in molecular electronics and photovoltaics.
• Surface anchoring strategies enhance the stability and performance of photoactive molecular assemblies.