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IR Region of Electromagnetic Radiation

Sample Preparation. Solution-dissolve sample in halogenated solvent such as CCl4Neat liquid-small amount (1 drop) of sample on salt platesThin film-sheet of sample placed directly in IR beamPressed Pellet-small amount of solid sample mixed with KBr and pressed into a thin waferNujol-small amount

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IR Region of Electromagnetic Radiation

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    1. IR Region of Electromagnetic Radiation 4000-600 cm-1 is most useful for identification of functional groups. 4000-1450 cm-1 is called the functional group region and is where characteristic signals for specific functional groups are most commonly found. 1450-600 cm-1 is called the fingerprint region because unique patterns for individual molecules are produced (often difficult to interpret).

    2. Sample Preparation Solution-dissolve sample in halogenated solvent such as CCl4 Neat liquid-small amount (1 drop) of sample on salt plates Thin film-sheet of sample placed directly in IR beam Pressed Pellet-small amount of solid sample mixed with KBr and pressed into a thin wafer Nujol-small amount of solid sample mixed with Nujol (mineral oil) and paste is applied to salt plates

    3. Polystyrene Standard for IR

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