The electron density around each nucleus in a molecule varies according to the types of nuclei and bonds in the molecule. The opposing field and therefore the effective field at each nucleus will vary This is called the chemical shift phenomenon The chemical shift of a nucleus is the difference between the resonance frequency of the nucleus and a standard relative to the standard. This quantity is reported in ppm (parts per million) and given the symbol delta, memo: 8=(v-VREF X10/vREF Standard: TMS. DSS. etc THNMR YAN
The electron density around each nucleus in a molecule varies according to the types of nuclei and bonds in the molecule. The opposing field and therefore the effective field at each nucleus will vary. This is called the chemical shift phenomenon. The chemical shift of a nucleus is the difference between the resonance frequency of the nucleus and a standard, relative to the standard. This quantity is reported in ppm （parts per million) and given the symbol delta, memo: d = (n - n REF) x10 6 / n REF Standard: TMS, DSS, etc THNMR YAN
solvent dependence Ethanol-CDCI3 CH3 CH2. OH 109 Ethanol -D2O OH CH3 CH THNMR AN
solvent dependence THNMR YAN