lect_22 - LECTURE 22 OPTICAL SPECTROSCOPY II UV/VIS -...

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Unformatted text preview: LECTURE 22 OPTICAL SPECTROSCOPY II UV/VIS - CHIROPTICAL P 8 BEGIN HERE UV-VIS SPECTROMETERS ARE UBIQUITOUS UV = 300 kcal/mol 10-5 10-5 What functional groups are observed in UV/vis spectrum? UV/vis (200-600 nm) Functional groups Ketone Ester Amide Conjugated D.B Not observed C-C C-H C=C (isolated) C-C LUMO HOMO C=C LUMO HOMO C=C-C=C LUMO HOMO =217 nm Excitation 4 3 2 1 =165nm =125nm UV Absorbance A = log (I /I) = cl I : intensity of the transmitted light I : intensity of the incident light : the molar excitation coefficient or molecular absorption ( max ) c: concentration of the sample (mol/L) l: path length (cm) P354 A = 0.8 Conc: 4x10-5 M Path: 1 cm = 0.8/4x10-5 x1 = 2x10 4 = 20000 Isoprene P354 P352 P356 (see also 359) P360 1. * 1. 3100cm-1 =C-H 2. 1700cm-1 C=C 3. m/z (APT) = 136 C 10 H 16 U# = 3 5. 2 db & 1 ring pg 390 1. * 1. 3100cm-1 =C-H 2. 1700cm-1 C=C 3. m/z (APT) = 136 C 10 H 16 U# = 3 5. 2 db & 1 ring C Me Me H C Me C C H C H 253 15 268 217 20 237 217 20 237 P356-2H (134)-Me 119 Moler Rotation:...
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lect_22 - LECTURE 22 OPTICAL SPECTROSCOPY II UV/VIS -...

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