IRMSHLSF07

IRMSHLSF07 - The molecular mass The molecular formula...

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Unformatted text preview: The molecular mass The molecular formula Certain structural features of the compound Information Obtained from Mass Spectrometry A Mass Spectrometer The mass spectrometer records a mass spectrum • Only positively charged fragments are detected • m/z = mass to charge ratio of each fragment •Most fragments have a single positive charge therefore m/z = mass •The peak with the highest m/z value represents the molecular ion (M) = molecular weight of the parent molecule Molecular ion unstable - continues to fragment CH 3 CH 2 CH 2 CH 2 CH 3 high energy beam of electrons CH 3 CH 2 CH 2 CH 2 CH 3 + e- molecular ion C 5 H 12 : 5(12) + 12(1) = 72 Isotopes and Mass Spectrometry 1 H : 2 H = 0.015 : 99.0985 12 C : 13 C = 1.10 : 98.90 35 Cl : 37 Cl = 3:1 79 Br : 81 Br = 1:1 *Relative peak height of M+1 or M+2 peak is proportional to the natural abundance of the isotope Infrared Spectroscopy E = h υ = hc λ Wavenumber = = 1/ λ (cm-1 ) 4000 600 % transmission (or % reflectance at Duke)...
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This note was uploaded on 05/13/2010 for the course CHEM 151L taught by Professor Roy,christopher during the Fall '08 term at Duke.

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IRMSHLSF07 - The molecular mass The molecular formula...

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