Novel Multicolor Schiff Base Polymers Prepared via Oxidative Polycondensation

Area of Science:

• Materials Science
• Polymer Chemistry
• Organic Synthesis

Background:

• Schiff bases and their polymers are versatile organic compounds with diverse applications.
• Oxidative polycondensation is a key method for synthesizing conjugated polymers.
• Understanding the photophysical and thermal properties is crucial for material development.

Purpose of the Study:

• To synthesize novel diimine Schiff bases and their corresponding polymers.
• To characterize the synthesized compounds using various spectroscopic and analytical techniques.
• To investigate the optical, electrochemical, and thermal properties of the synthesized materials.

Main Methods:

• Synthesis via oxidative polycondensation.
• Structural confirmation using Nuclear Magnetic Resonance ((1)H-NMR, (13)C-NMR), Fourier-Transform Infrared (FT-IR), and Ultraviolet-Visible (UV-vis) spectroscopy.
• Electrochemical analysis using cyclic voltammetry (CV).
• Photophysical characterization including fluorescence spectroscopy and quantum yield determination.
• Thermal analysis using Thermogravimetric Differential Analysis (TG-DTA) and Differential Scanning Calorimetry (DSC).

Main Results:

• Successful synthesis and structural elucidation of diimine Schiff bases and polymers.
• Determination of electrochemical and optical band gaps.
• Investigation of fluorescence properties in different solvents and concentrations.
• Calculation of a 16% fluorescence quantum yield for the polymer 5-(diethylamino)-2-(biphenylmethylene) hydrazonomethylphenol (PDEAHP) in N,N-Dimethylformamide (DMF).
• Analysis of thermal stability and transitions of the polymers.

Conclusions:

• The synthesized diimine Schiff bases and polymers possess interesting photophysical and electrochemical properties.
• PDEAHP demonstrates significant fluorescence, suggesting its potential for optoelectronic applications.
• The materials exhibit good thermal stability, as indicated by TG-DTA and DSC analyses.