Electronic Spectroscopy Powerpoint Templates Page 1 Powerpoint Templates

Electronic Spectroscopy Powerpoint Templates Page 1

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· 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 10

· 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 11

* 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 150 -250 nm region. n * and * transitions: most common transitions observed in organic molecular UVVis, observed in compounds with lone pairs and multiple bonds with max = 200 -600 nm. · Charge transfer (CT) – MLCT (metal-to-ligand charge transfer) – LMCT (ligand-to-metal charge transfer) Powerpoint Templates Page 12

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