What makes a compound uv active and appear on a fluorescent tlc plate?
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Most commercially bought TLC plates contain a fluorescent material (e.g. zinc sulfide) in the silica or alumina, so the background of the plate will appear green when viewing with short-waved UV light. ... It is most useful for visualizing aromatic compounds and highly conjugated systems, as these strongly absorb UV
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The most common non-destructive visualization method for TLC plates is ultraviolet (UV) light. ... If a compound absorbs 254nm UV light, it will appear dark, as the compound prevents the fluorescent material from receiving the UV light. This method is so quick and easy that it is often the first visualization method tried.