Dear Sir. Concerning your issue about the possibility to find refractive index of a material in solution form, from its UV/Vis absorption spectrum. The dispersion curve of CaF2 (i.e., refractive index as a function of wavelength) was determined by temperature-dependent UV-vis spectroscopy of solid CaF2powder intercalated by liquid hexadecane. The relative error between the literature and the experimental values for the index of refraction of CaF2 was about 1‰ at most visible wavelengths. This exercise introduces students to a novel spectroscopic method for refractive index measurement and illustrates the variation in refractive index of a typical solid over the visible wavelength region. I think the following below links and the attached file may help you in your analysis:

https://pubs.acs.org/doi/abs/10.1021/ed079p619

https://www.osapublishing.org/DirectPDFAccess/2167E7BB-08B8-A980-FCA971D68CEA7EDB_227618/oe-20-4-4653.pdf?da=1&id=227618&seq=0&mobile=no

Thanks

Yes. It is possible to find the refractive index from uv-vis spectra. Before you proceed further, you need to find out optical band gap.

If you want to find more precise value of refractive index of your dye, use abbe refractometer.

Thank you everyone for your response !

Dear Srinivas Boora

Dear Rishibrind Upadhyay

I have found the optical band gap. Please share the method to calculate the refractive index.

Find the following attached file, in which use equation 12 to get refractive index from optical band gap.

thanks.

Thanks a lot Srinivas Boora.

I have also found one paper to find refractive index. It might also be helpful.