Lecture 3 - TLC

Lecture 3 - TLC - Announcements TLC lab next time BRING...

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Announcements TLC lab next time BRING ruler (mm) , pencil & calculator Before next lab period, complete: MP post-lab quiz TLC pre-lab quiz MP/Recrystallization post-lab report* Tutorials: Require MS Internet Explorer Tutorials now online Post-lab quizzes now available TLC handwritten notes: pp. 15-20 of manual Lab manuals available at area bookstores
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Chromatography: Separation TLC Plate ? ABCDE Basic principle -- components of a mixture will distribute unequally between two immiscible phases: mobile phase (“eluant,” or solvent) stationary phase (thin layer of silica gel on plate… hence TLC ) “writing with color”
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Thin-Layer Chromatography (TLC) A form of solid-liquid adsorption chromatography; a powerful and largely analytical technique used for: - Determining the purity of materials (One spot = pure) BEFORE DEVELOP AFTER (PURE) AFTER (IMPURE)
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Thin-Layer Chromatography (TLC) A form of solid-liquid adsorption chromatography; a powerful and largely analytical technique used for: - Determining the purity of materials (One spot = pure) - Preliminary identification purposes (Forensic analysis of inks, drugs, etc.) DIFFERENT BEFORE DEVELOP LIKELY MATCH cocaine (standard) unknown compound
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Thin-Layer Chromatography (TLC) A form of solid-liquid adsorption chromatography; a powerful and largely analytical technique used for: - Determining the purity of materials (One spot = pure) - Preliminary identification purposes (Forensic analysis of inks, drugs, etc.) - Monitoring progress of reactions (Still a starting material spot? New spot?) SOME SM BEFORE DEVELOP NO RXN Starting material Reaction mixture NO SM
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Lecture 3 - TLC - Announcements TLC lab next time BRING...

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