Abstract
Present communication reports on the experimental values of NMR spin–lattice relaxation time (T1) of 3-hydroxy, 4-methoxy benzaldehyde, 4-hydroxy, 3-methoxy benzaldehyde, o-nitrobenzaldehyde, o-hydroxy benzaldehyde and p-chlorobenzaldehyde and Mutual viscosity (η12) of o-chlorobenzaldehyde, m-chlorobenzaldehyde and p-chlorobenzaldehyde. The experimental values of T1 have been correlated with the calculated values of T1 obtained using various equations of the dielectric relaxation time (τ). It has been concluded that the equations of Writz and Murty are better representations of the dielectric relaxation phenomenon. From the correlation of τ and η1 it has been found that the coefficient of mutual viscosity (η12) is a better representation of the hindrance to the rotation of the individual solute molecules.
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