Hydrogen bonding and picosecond relaxation studies of ortho-hydroxybenzaldehyde from dielectric measurement's

Molar polarization P-2, Kirkwood correlation factor g, dipole moment mu, av erage relaxation time tau(0), relaxation time corresponding to overall rota tion tau(1) and groups rotation tau(2) and dielectric free energy of activa tion Delta F tau(0) of ortho-hydroxybenzaldehyde in dilute solutions of ben zene have been calculated by measurements of the static dielectric constant at 1MHz, the refractive index (using a sodium light) and 9.83 GHz microwav e dielectric constant at 10, 20 and 35 degrees C. It is found that all thes e parameters are temperature dependent. The anomalous behaviour of g and P2 with concentration has been observed. The calculated relaxation time has b een discussed in terms of molecular structure of ortho-hydroxybenzaldehyde with temperature variation.