Refractive index of 5 glycols and glycerol versus wavelength and temperature

Description

The dataset consists of tables of refractive index values versus wavelength and temperature (n(lambda, T) for 6 hygroscopic organic liquids. Each table corresponds to one liquid: ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol (propane-1,2-diol), and glycerol. The measurements cover the range from 390 to 1070 nm in wavelength and from 1 to 45ºC in temperature. Each data point corresponds to a mean value of several measurements. The outlaying measurement series were discarded. The accuracy of the refractive index measurement is estimated to be ±0.0003, while the accuracy of the wavelength measurement is ~1%, and the accuracy of the temperature measurement is −0.3/+0.6 K. The measurements were performed with a modified Abbe refractometer, calibrated with water at each temperature. For liquids other than ethylene glycol, the calibration at 1ºC was augmented with that for ethylene glycol. We sampled the following liquids: (i) ethylene glycol, anhydrous, 99.8% Sigma-Aldrich lot # STBG3967V; (ii) diethylene glycol, ≥99.0%, Sigma lot # BCBT4833; (iii) triethylene glycol, 99%, Alfa Aesar lot # 10198029; (iv) tetraethylene glycol, 99%, Alfa Aesar lot # M17E015; (v) propylene glycol (propane-1,2-diol), ≥99.5%, Sigma-Aldrich lot # MKC80613V; (vi) glycerol, BioUltra, anhydrous, ≥99.5%, Sigma lot # BCBS7814V.

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