Solvent Resonance Decoupling in Carbon/13 NMR
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
In high resolution nuclear magnetic resonance (NMR), the samples are dissolved in solvents containing the isotopes of deuterium or fluorine. An electronic signal derived from these isotopes is used to stabilize the static magnetic field and/or the sources of radio frequency fields. This method is called field-frequency lock. The carbon-13 resonances of the solvent often cover a certain range of frequencies due to nuclear coupling between the carbon-13 isotopes and the solvent isotopes used for field-frequency stabilization. These complex resonances often overlap the carbon-13 resonances of the sample being investigated. The strong radio frequency irradiation of the deuterium (or fluorine) resonances is called decoupling, and it produces single resonances for carbon-13 resonances due to the solvent.