Mass Spec

Mass Spec - Peaks with smaller m/z values __ called...

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Analytical Chemistry • Chromatography (Separations) Mass Spectrometry • Infrared (IR) Spectroscopy • Nuclear Magnetic Resonance (NMR) Spectroscopy • X-ray Crystallography (visual solid state molecular structure)
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What insights are we hoping to gain? • Molecular Mass/Isotopic Distribution • Molecular Formula • Some Structural Characteristics – Fragmentation Pattern Mass Spectrometry
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Only molecules of the correct m/z (mass/charge) will make it to the detector. Mass Spectromeric Isotope Indentification
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EI-MS of toluene
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EI-MS of 2,2-Dimethyl Pentane
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Molecular ("parent") ion Fragment ("daughter") ions Base peak (largest signal)
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Unformatted text preview: Peaks with smaller m/z values __ called fragment ion peaks __ represent positively charged fragments of the parent molecule EI-MS of 2,2-Dimethyl Pentane Molecular ion tert-butyl cation ( iso ) propyl cation Me Me Me methyl cation ethyl cation EI-MS of 2,2-Dimethyl Pentane 60 31 42 EI-MS of n-Propanol EI-MS of 4-Heptanone EI-MS of 4-Heptanone Molecular Ion Why is there a signal higher than the Molecular ion? EI-MS of 4-Heptanone Isotopes 170 172 91 EI-MS of Benzyl Bromide Isotopes 170 172 91 C 7 H 7 79 Br C 7 H 7 81 Br Benzyl cation EI-MS of Benzyl Bromide EI-MS of 4-Chloroanisole Isotopes Isotopes...
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This note was uploaded on 02/09/2010 for the course CH CH242 taught by Professor Katz during the Spring '10 term at Colby.

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Mass Spec - Peaks with smaller m/z values __ called...

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