研究目的
To study the dependence on the π-conjugated bridge length of the intervalence charge-transfer transitions (IV-CT) and of the electronic coupling between the redox centers in biarylaminofluorene-based systems with donor-π-donor (D-π-D) structure.
研究成果
The study demonstrated that biarylaminofluorene-based systems with D-π-D structure exhibit intense intervalence charge transfer (IV-CT) in the NIR region, which can be exploited for electrochromic and electrofluorochromic applications. The compounds showed excellent photophysical properties, with high quantum yield and molar absorptivity of the IV-CT. The fluorescence switching experiments highlighted the potential of these materials in displays, molecular logic gates, sensors, and memory devices.
研究不足
The study focuses on the electronic properties and optoelectronic applications of biarylaminofluorene-based systems. The limitations include the specific focus on these systems and the solvents used for studying photophysical properties.
1：Experimental Design and Method Selection:
The study involved the synthesis of biarylaminofluorene-based systems with D-π-D structure and related D-π compounds. Cyclic voltammetry, UV/Vis-NIR, fluorescence spectroscopy, and computational investigations were employed to characterize the electronic structure of the compounds in neutral, mono-, and dication states.
2：Sample Selection and Data Sources:
The samples were synthesized through palladium-catalyzed C-N (Buchwald-Hartwig) and C-C (Suzuki, Sonogashira) cross-coupling reactions. The photophysical properties were studied in solvents with different polarity.
3：List of Experimental Equipment and Materials:
UV-Vis absorption spectra were recorded on a Varian-Cary 3000 spectrophotometer. Luminescence experiments were performed with an Edinburgh FLS980 spectrometer. Redox titrations monitored by UV/Vis/NIR spectroscopy were performed using a Varian-Cary 5000 UV-Vis-NIR absorption spectrometer.
4：Experimental Procedures and Operational Workflow:
The compounds were synthesized, characterized, and their photophysical properties were studied in various solvents. Electrochemical characterization was carried out by cyclic voltammetry. Spectroelectrochemical experiments were performed to study electrochromic and electrofluorochromic properties.
5：Data Analysis Methods:
The data were analyzed using Gaussian functions to extrapolate the main parameters characterizing the IV-CT band. The electron coupling between diabatic states in MV systems was estimated according to the Mulliken-Hush theory.
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