Conjugated organometallic polymer containing a redox-active center

Area of Science:

• Organometallic Chemistry
• Polymer Science
• Materials Science

Background:

• Conjugated organometallic polymers offer tunable electronic and optical properties.
• Platinum-containing polymers are of interest for their unique coordination chemistry and potential applications.

Purpose of the Study:

• Synthesize and characterize a novel conjugated organometallic polymer with platinum and quinone diimine units.
• Investigate the electronic and optical properties of the synthesized polymer and a related model complex.
• Explore the electrochemical behavior and charge transfer characteristics.

Main Methods:

• Synthesis of conjugated organometallic polymer and model complex via condensation reactions.
• Characterization using Gel Permeation Chromatography (GPC), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (ATG), electrochemistry, X-ray diffraction, NMR, and IR/Raman spectroscopy.
• Computational studies using density-functional theory (DFT) and time-dependent density-functional theory (TDDFT).

Main Results:

• A new conjugated organometallic polymer (3) and a cyclic mononuclear model complex (4) were successfully synthesized.
• Polymer 3 exhibited a defined molecular weight (M(n) = 18500, M(w) = 25000, PD = 1.37) and trans-geometry around platinum.
• Electrochemical studies revealed a quasi-reversible 2-electron reduction process in polymer 3 upon addition of trifluoroacetic acid.
• UV-vis spectra showed red-shifted charge transfer absorptions, consistent with DFT/TDDFT calculations.
• The polymer was found to be non-luminescent.

Conclusions:

• The synthesized organometallic polymer possesses interesting electronic and electrochemical properties.
• The quinone diimine unit can undergo reversible reduction, suggesting potential for redox-active applications.
• The study provides insights into the structure-property relationships of platinum-containing conjugated polymers.