homework_HWK3 - C, insoluble in water, soluble in acetone,...

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CHEM 520 Analytical Mass Spectrometry Homework 3 Due February 26, 2010 Use the given mass spectra, isotope abundances, and accurate mass measurements to assign ion compositions, identify molecular ions, and attempt to interpret the spectra to list plausible structure candidates. You may need to consult the textbook for the important ion series to help you with structure assignment. The accurate masses are within 0.0006 of theoretical values. Unknown #1 This mass spectrum served as a quality control document for a colorless synthetic chemical of melting point 185 ° C. Accurate mass measurements gave m/z 140.0269, 123.0242, and 30.9984. Note that peaks of <0.8% intensity may not be reported in the spectrum. You may need to use a ruler to estimate the isotope peak intensities. 1
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Unknown #2 A biodegradation product of a well-known pesticide. A colorless solid of m.p. 75-77
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Unformatted text preview: C, insoluble in water, soluble in acetone, ether, benzene, and other organic solvents. This low-resolution mass spectrum was obtained by GC-MS, and so accurate mass measurements are not available. m/z rel. intensity m/z rel. intemsity m/z rel. intensity 219 1.4 182 1.2 114 0.6 218 10.1 181 8.7 113 9.7 217 4.4 142 1.8 112 2.0 216 30.6 141 22.9 111 30.0 140 5.5 106 7.8 139 71.7 105 100.0 78 3.4 77 52.0 2 Unknown #3 This spectrum belongs to a well-known herbicide and was obtained by GC-MS, so that only ion relative intensities were measured with reproducibilities within 5% relative or 0.2% absolute, whichever was greater. See the table of ion relative abundances on the next page. The herbicide is known to form salts when reacted with alkali hydroxides. 3 4...
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This note was uploaded on 03/04/2010 for the course CHEM chem 520 taught by Professor Turecek during the Winter '10 term at University of Washington.

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homework_HWK3 - C, insoluble in water, soluble in acetone,...

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