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-Before using any instruments, make sure the lab instructor (TA or professor) has instructed you on its use. DO NOT use any of the instrument unless you are supervised by a lab instructor, graduate instrument assistant, or by a professor. All of these instruments are very expensive, and printing out and reading the directions alone is not enough information to be able to properly use any of the instruments. |
Nuclear Magnetic Resonance
-Nuclear magnetic resonance (NMR) spectroscopy is an instrumentation method based on measuring the absorption of electromagnetic radiation in a region of 4 to 900 MHz. It is a very powerful tool for chemists for the determination of the structure of molecules (Skoog et al. 1998). -In 1924, the theoretical basis of NMR spectroscopy was proposed by W. Pauli. He suggested that certain nuclei should have properties of spin and magnetic moment; therefore, the exposure of the nuclei to a magnetic filed should split their energy levels (Skoog et al. 1998). In 1953, the first commercial NMR instruments became available,but were limited to 60 to 100 MHz (Silverstein and Webster, 1998). -Within
a molecule, the different hydrogens respond differently to the
electromagnetic radiation due to many different factors. The important
information to note is that this different response allows a chemist
to determine the structure of a chemical, given enough practice
and information.
Under construction Please be patient.
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