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(just a brief about nmr, as my friend needed some help..so thought to share it with you guys too).
Nuclear Magnetic Resonance (NMR) spectroscopy is an analytical chemistry technique used in quality control and reserach for determining the content and purity of a sample as well as its molecular structure.
The principle behind NMR is that many nuclei have spin and all nuclei are electrically charged. If an external magnetic field is applied, an energy transfer is possible between the base energy to a higher energy level (generally a single energy gap). The energy transfer takes place at a wavelength that corresponds to radio frequencies and when the spin returns to its base level, energy is emitted at the same frequency. The signal that matches this transfer is measured in many ways and processed in order to yield an NMR spectrum for the nucleus concerned.
Chemical shifts are the locations in an nmr spectrum where a nucleus absorbs energy.
Organic chemists use nmr spectroscopy to find about, particularly, the hydrogen atoms in molecules.
low resolution nmr enables identification of:
1. no. of diff types of proton- from the no. of peaks.
2. relative no. of hydrogen atoms in each group- from area under the peaks.
Nuclear Magnetic Resonance (NMR) spectroscopy is an analytical chemistry technique used in quality control and reserach for determining the content and purity of a sample as well as its molecular structure.
The principle behind NMR is that many nuclei have spin and all nuclei are electrically charged. If an external magnetic field is applied, an energy transfer is possible between the base energy to a higher energy level (generally a single energy gap). The energy transfer takes place at a wavelength that corresponds to radio frequencies and when the spin returns to its base level, energy is emitted at the same frequency. The signal that matches this transfer is measured in many ways and processed in order to yield an NMR spectrum for the nucleus concerned.
Chemical shifts are the locations in an nmr spectrum where a nucleus absorbs energy.
Organic chemists use nmr spectroscopy to find about, particularly, the hydrogen atoms in molecules.
low resolution nmr enables identification of:
1. no. of diff types of proton- from the no. of peaks.
2. relative no. of hydrogen atoms in each group- from area under the peaks.