Prediction of liquid viscosity for organic compounds by a quantitative structure-property relationship

The liquid viscosity of 361 organic compounds containing C, H, N, O, S and/or halogens was investigated using a quantitative structure–property relationship (QSPR) approach. A five-descriptor equation was obtained with a squared correlation coefficient (R2) of 0.854 and a standard error (S) of 0.22 log units. The data set­was divided into three subsets and each of these was cross-validated by the model obtained from the complementary two subsets; the result indicates a high statistical robustness of the overall model. The average absolute error S2 of 0.0494 log units is small compared with the overall range of eta of 1490 mPas.