Posted by Audrey on Friday, October 24, 2008 at 6:40pm.
Iodine has a high vapor pressure, for a solid, plus it is quite reactive to unsaturated compounds. The long and short of it is that iodine has a high affinity for organic compounds and because it vaporizes easily it can stain those spots on a TLC plate that are colorless thus making them visible. Care must be taken to circle the spots on the plate lightly (with a pencil) for the I2 often does not stay put when the compound is removed from the staining vessel.
Thank you!! =]
Thank you!! =]
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