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Fluorescence and Phosphorescence: Instrumentation

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.

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In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

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Fluorescence on the Flow: Continuous Xanthene Dye Synthesis from Gallic Acid in a Coiled Flow Inverter.

Anikesh Tripathi¹, Surja Kanta Pal², Swapna Patel¹

¹Department of Chemical Engineering and Biochemical Engineering, Rajiv Gandhi Institute of Petroleum Technology, An Institution of National Importance, Government of India, Jais, Uttar Pradesh, 229304, India.

|August 28, 2025

Summary

Transparent coiled flow inverters (CFI) enable efficient continuous flow condensation reactions for organic molecules. This study optimized gallic acid condensation using CFI, yielding a green emissive xanthene analog.

Keywords:

coiled flow inverter condensation reactions continuous‐flow synthesis heat transfer stimuli‐responsive fluorophore

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Published on: April 1, 2013

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Published on: April 1, 2013

Area of Science:

Organic Chemistry
Chemical Engineering
Materials Science

Background:

Transparent coiled flow inverters (CFI) offer advantages over opaque reactors but are underexplored for condensation reactions.
Continuous flow synthesis provides enhanced control and scalability for chemical processes.

Purpose of the Study:

To investigate the continuous flow condensation reaction of gallic acid using transparent coiled flow inverters (CFI).
To optimize the production of a green emissive xanthene analog via flow chemistry.
To demonstrate the tailor-made and economical nature of CFI-based flow reactors.

Main Methods:

Utilized transparent coiled flow inverters (CFI) with a 4 mm internal diameter for continuous flow synthesis.
Varied reactor length by connecting CFIs in series to achieve desired residence times.
Employed real-time imaging to monitor reaction dynamics and product formation.
Optimized reaction parameters including temperature, flow rate, and residence time.

Main Results:

Successfully synthesized a green emissive xanthene analog from gallic acid condensation in dimethyl formamide.
Identified optimal conditions: 190°C, 5 mL/h flow rate, ~14 h residence time, and 4.46 W/m² heat flux for maximizing product yield.
Observed enhanced product yield due to the presence of a vapor-liquid phase boundary increasing interfacial area.

Conclusions:

Transparent coiled flow inverters (CFI) are effective for continuous flow condensation reactions, offering superior insights compared to opaque reactors.
CFI-based flow reactors are adaptable and cost-effective for synthesizing organic emitters.
The study highlights the potential of CFI for scalable and efficient organic synthesis.