Dipole moments, semiempirical molecular orbital modeling

Murdachaew et used the SCP-NDDO semiempirical molecular orbital model to calculate an increase in the dipole moment from the equilibrium gas-phase value to the liquid-phase value from 2.16 D to 2.8 D, an increase of 30%, whereas with the older PM3 and PM6 NDDO-t3q)e method, which significantly underestimate the polarizability of water, they found that the increase was only 9% and 11%, respectively. 

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