研究目的
Investigating the impact of replacement of nitrogen with phosphorus atom in the pyromellitic diimides on their photophysical and electrochemical properties.
研究成果
The replacement of nitrogen with phosphorus atom in pyromellitic diimides results in a red shift of absorptions, enhancing charge transfer character and narrowing band gaps. The materials showed weak emissions in solution and exhibited phosphorescence in solid films. Electrochemical studies revealed multi-step reduction processes, with the generation of radical anion species. These findings suggest potential applications in organic electronics as host materials or electron acceptors.
研究不足
The study is limited by the low solubility of some compounds in common organic solvents, which affected the quality of spectroelectrochemical spectra and EPR analysis.
1：Experimental Design and Method Selection:
The study employed steady- and time-resolved spectroscopic and spectroelectrochemical techniques to investigate the photophysical and electrochemical properties of benzene-cored diketophosphanyl compounds.
2：Sample Selection and Data Sources:
Diketophosphanyl compounds (1, 2, and 1-O) were used as samples, characterized by NMR, IR, and mass spectroscopic techniques.
3：List of Experimental Equipment and Materials:
UV-3600 Shimadzu spectrophotometer, Jobin Yvon Horiba Fluoromax 3, Nd:YAG laser, gated intensified charge coupled device CCD camera, Ecochemie AUTOLAB potentiostat-galvanostat, UV-Vis Hewlett Packard spectrophotometer, JEOL JES-FA 200 EPR spectrometer.
4：Experimental Procedures and Operational Workflow:
Samples were prepared by dropcasting a toluene solution of the phosphorus compounds with zeonex? onto clean quartz substrates. Electrochemical measurements were performed in a three-electrode cell.
5：Data Analysis Methods:
Data were analyzed using WinSim software for EPR spectra simulation and Gaussian 09 package for theoretical calculations.
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