April18_2005_2pp

April18_2005_2pp - Website updates Typo#20-6(should refer...

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1 April 18, 2005 ¾ Website updates ¾ Typo: #20-6 (should refer to example 20- 4, not 20-2) ¾ Review Session: TODAY! 5 pm, B203 ¾ Exam #3: Wednesday, 7 pm, B104 •(No Class on Wednesday!) ¾ Office Hours: TODAY! (until 1:55 pm) 2 More on Isotopes ¾ Determine abundance patterns of molecular ion peak(s) and of fragment peaks ¾ Patterns are characteristic of: 9 Element(s) responsible for isotopomers 9 The number of elements in the compound/fragment ¾ This can get complex . . . consider hemoglobin: C 2954 H 4516 N 780 O 806 S 12 Fe 4 - a BIG molecule! 3 3 2 3 4 4 isotopes (nat’l) (Aside: it is unlikely to find two identical hemoglobin molecules in a single drop of blood!)
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3 Molecular Structure Determination ± Fragmentation is due to the chemistry of the ions in the ionization chamber and is indicative of molecular structure: ¾ Alcohols: lose water peak at (M-18) + ¾ Acids: lose OH peak at (M-17) + ¾ Amides: lose NH 2 peak at (M-16) + ¾ CH 3 is commonly lost peak at (M-15) + ¾ etc!
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April18_2005_2pp - Website updates Typo#20-6(should refer...

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