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The refractive indices measurements are carried out on a number of Schiff’s base 6O.Om compounds with m = 4, 6 to 10 using a wedge shaped cell with a modified spectrometer. The transition temperatures obtained using the POM and DSC are in agreement within the experimental errors. The birefringence data  along with the density results are employed to estimate the molecular polarisabilty anisotropy,  assuming a particular local field (due to Vuks and Neugebauer) the nematic molecule experiences and the order parameter S is estimated from  and  i.e., polarisabilty anisotropy in the perfect order which is estimated employing different methods. Using these values, the orientational order parameter S has been estimated at different temperatures in their nematic phase. Further, S can also be obtained from Kuczynski et al. model and also using the effective geometry parameter, Further, it is observed that from our analysis the S value obtained from  and  are identical. The results are analyzed and compared with the body of data available. 

Schiff’s base 6O.Om LC compounds, refractive indices, orientational order parameter, molecular polarizabilities.