研究目的
To synthesize and study new photochromic indoline spiropyrans containing cationic substituents and bulky groups in the 2H-chromene moiety, and to investigate their spectral and photochromic properties.
研究成果
The introduction of a cationic substituent at the 60-position of the 2H-chromene moiety significantly increases the photoinduced isomer's lifetime and causes a bathochromic shift in the absorption maximum of the open form. These findings suggest potential applications in molecular electronics and photonics.
研究不足
The study focuses on the synthesis and photochromic properties of specific spiropyrans, with potential limitations in the applicability of these compounds in broader contexts or under different conditions.
1：Experimental Design and Method Selection:
The synthesis involved a one-pot condensation reaction of 1,2,3,3-tetramethyl-3H-indolium perchlorate with aromatic dialdehydes in the presence of triethylamine.
2：Sample Selection and Data Sources:
The structures of the synthesized compounds were confirmed using NMR, IR spectroscopy, elemental analysis, and HRMS.
3：List of Experimental Equipment and Materials:
Instruments included a Bruker AVANCE-600 spectrometer, Varian Excalibur 3100 FT-IR, Agilent 8453 spectrophotometer, and an Agilent Xcalibur Eos diffractometer.
4：Experimental Procedures and Operational Workflow:
The reaction mixtures were refluxed, followed by purification through column chromatography and recrystallization.
5：Data Analysis Methods:
The photochromic properties were studied by recording absorption spectra and kinetic curves under UV irradiation.
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