Powerpoint Templates Page 1 Powerpoint Templates Electronic Spectroscopy

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Powerpoint Templates Page 10  UV-Vis Terminology –Chromophore: a UV-Visible absorbing functional group –Bathochromic shift (red shift): to longer wavelengths –Auxochrome: a substituent on a chromophore that causes a red shift –Hypsochromic shift (blue shift): to shorter wavelengths –Hyperchromic shift: to greater absorbance –Hypochromic shift: to lesser absorbance

Powerpoint Templates Page 11  Classes of Electron transitions (1) ,  and n electrons (mostly organics) (2) d and f electrons (inorganics/organometallics) (3) charge-transfer (CT) electrons

Powerpoint Templates Page 12    * and    * transitions: high-energy, accessible in vacuum UV ( max <150 nm). Not usually observed in molecular UV-Vis. n   * and    * transitions: non-bonding electrons (lone pairs), wavelength ( max ) in the nm region. n   * and    * transitions: most common transitions observed in organic molecular UV- Vis, observed in compounds with lone pairs and multiple bonds with max = nm.  Charge transfer (CT) –MLCT (metal-to-ligand charge transfer) –LMCT (ligand-to-metal charge transfer)

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