Temperature Dependent Magnetic Susceptibility and Equilibrium Studies in Solution: Evans’s Method

The chemical shift in a solvent caused by the presence of a paramagnetic species and thetemperature dependence of the chemical shift difference to determine the temperaturedependent magnetic susceptibility can be studied using Evans method. The method is very useful because a common NMR instrument, easily accessible in a department of chemistry, allows the accurate measurement of paramagnetic susceptibilities. The present review highlights planar (S = 0) and octahedral (S = 1) forms of Ni(II) complexes are in equilibrium and has been followed in the temperature range 298 − 338 K by 1H NMR technique using the protocol of Evans’s method.