Common compounds showing pink or blue under 366 nm UV:

1. Flavonoids:

• Often show bright blue or green-blue fluorescence under UV.
• Example: Quercetin, Rutin, Kaempferol.
• Usually found in plant extracts.

2. Anthraquinones:

• Exhibit pink to red or violet fluorescence.
• Found in plants like Senna, Aloe, Rhubarb.
• Examples: Emodin, Aloin.

3. Coumarins:

• Show blue or bluish-white fluorescence.
• Example: Coumarin, Umbelliferone, Scopoletin.
• Common in many essential oils and plant materials.

You Can Do Next:

From what you described, the compounds in your extract are likely flavonoids or other polyphenols. The bluish and pinkish glow under UV light (366 nm) is quite common for some flavonoids. Spraying with AlCl₃ usually makes the glow stronger or clearer, which fits with what you saw — this suggests the presence of flavonoids, though not all will change color a lot.

The slight gray color after FeCl₃ spray means there might be phenolic groups, but this test doesn’t always give a strong reaction with every flavonoid.

Overall, your results match the typical behavior of flavonoids or polyphenols on TLC. If you want to be sure, you could run known flavonoid standards (like quercetin or rutin) next to your sample, or do further testing like HPLC or LC-MS.

I think it is Flavonoids or other phenolic compounds, you need more qualifications tests to make sure ( like HPLC compared with mass spectroscopy MS) because TLC alone is not a suitable precise method to study the structure or to determine the compound structure