1,2,3,3,8-Pentamethyl-5-(trifluoromethyl)-2,3-dihydro-1H-pyrrolo[3,2-g]quinolin-7(8H)-one TCI P2441

TCI P2441, 1,2,3,3,8-Pentamethyl-5-(trifluoromethyl)-2,3-dihydro-1H-pyrrolo[3,2-g]quinolin-7(8H)-one, is a functional dye built on a quinolinone framework fused to a pyrroline ring. It belongs to the family of photonic and optical materials. In the laboratory, dyes of this type are used to study light absorption and emission, to serve as test compounds in fluorescence work, and to act as components in optical materials research. The molecule pairs an amine-based electron-donating unit with an electron-withdrawing quinolinone core.

What sets this compound apart is its intramolecular push–pull structure. The nitrogen atom in the methylated pyrroline ring acts as the electron donor. The quinolinone core and the trifluoromethyl group at the 5-position act as electron acceptors. This combination typically produces an intramolecular charge-transfer transition that responds to its surroundings. The many methyl groups and the rigid framework also help keep the molecule stable. These features make this type of scaffold useful for photophysical studies and for developing new optical materials.

In Indonesia, this material is relevant to research groups working in photonics, spectroscopy, physical and organic chemistry, and materials science at universities and research institutes. Researchers can use it as a reference dye when they characterise absorption and emission behaviour, compare solvent effects on charge-transfer bands, or test new optical formulations. It also fits graduate and postgraduate projects that explore how donor–acceptor molecular design affects the optical properties of functional dyes.

• Absorption and emission spectroscopy: the push–pull quinolinone scaffold gives an intramolecular charge-transfer transition, so the compound works well for UV-Vis and fluorescence measurements.
• Solvatochromism and environment-sensitivity studies: its charge-transfer band typically responds to the surrounding medium, so researchers can probe how solvent polarity affects optical behaviour.
• Fluorescence reference or test compound: the rigid, heavily methylated framework helps molecular stability, which suits it to repeated comparative measurements in fluorescence experiments.
• Optical materials research: as a functional dye from the photonic materials class, it can be added as a component when formulating and evaluating experimental optical films or matrices.
• Structure–property relationship studies: its clearly defined donor (pyrroline nitrogen) and acceptor (quinolinone, trifluoromethyl) units make it a useful model for studying donor–acceptor dye design.

Store this dye in its original, tightly closed container in a cool, dry, well-ventilated area, away from direct light, heat sources, and strong oxidising agents. Amber glass or other light-protective containers work best for functional dyes, because prolonged light exposure can affect optical performance. Always follow the storage temperature shown on the TCI label and Safety Data Sheet. When handling, wear a laboratory coat, safety glasses, and chemical-resistant gloves, and work in a fume hood or well-ventilated area so you do not inhale dust or vapours. Avoid contact with skin and eyes, weigh only the amount you need, and label any prepared solutions clearly with their concentration and date. Dispose of waste according to local regulations and institutional chemical safety procedures.

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