describe the process whereby iodine visualizes otherwise invisible components of a developed thin layer plate

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Expert Solution

The method for the visualization of organic compounds with iodine vapor is based on the observation that iodine has a high affinity for both unsaturated and Aromatic compounds.

The process whereby iodine visualizes otherwise invisible components of a developed thin layer plate has following points:

In this method a chamber of around 100 mL wide mouth jar (with

cap) is added a piece of filter paper and few crystals of iodine.

Iodine has a high vapor pressure for a solid and the chamber will rapidly become saturated with iodine vapor.

Now insert the TLC plate and allow it to remain within the chamber until it develops a light brown color over the entire plate.

If the compound has an affinity for iodine, it will appear as a dark brown spot on a lighter brown background.

Now remove the TLC plate Carefully and gently circle the spots with a dull pencil, because after some time iodine will not remain on the TLC plate .

queen_honey_blossom answered 1 year ago

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