Organic Chemistry II |
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Professor Carl C. Wamser |
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Chem 335 - Winter 2005 |
Chapter 13 Skills |
Spectroscopy - Structure Determination
Knowledge - Level 1
Terminology:
electromagnetic radiation, frequency, wavelength, wavenumber
spectroscopy, absorption spectrum
index of hydrogen deficiency (degrees of unsaturation)
nuclear spin, precession, resonance
shielding/deshielding effects, chemical shift, TMS, ppm (delta)
spin-spin splitting, coupling constant, (n+1) rule
C-13 NMR, MRI
vibrational modes, fingerprint region, stretching frequencies
electronic energy, lambda max
m/z , mass-to-charge ratio
parent molecular ion - reference for M , M+1 , M+2 , M-1 peaks
base peak
low-resolution, high-resolution mass spectrometry
identify characteristics of electromagnetic radiation
identify types of molecular energy levels and the types of radiation that stimulate transitions within those energy levels
explain the concept of nuclear spin, the effects of a magnetic field, and the phenomenon of resonance
describe the types of vibrational energy modes - e.g., stretching, bending
explain the basic workings of an IR, UV-visible, NMR, or Mass Spec instrument
recognize possible ionization and fragmentations of a molecule
predict the number of peaks, their integrated area ratios, their approximate chemical shifts, and their spin-spin coupling patterns for a given compound in both H and C NMR spectra
use IR tables to identify the presence or absence of various functional groups
predict whether a compound will show absorption in uv/visible and an approximate lambda max
deduce the presence or absence of Br, Cl, S, N in a mass spectrum
identify the base peak and parent molecular ion in a typical mass spectrum
identify structures of major fragments in a mass spectrum
identify the likely structure of a compound based on spectral and other data