The difference between the gas phase standard condition of 1Atm, 298C and the 1M, 298C is 1.9kcal/mol. That is if the calculated DELTA G for the free energy of solvation at reference conditions of 1Atm, 298, is -10kcal/mol, than for gas phase reference condition at 1M,298C , solvation energy would be -11.89kcal/mol which is a large difference. From comparison between the experimental figures and the Gaussian calculated, it seems that Gaussian report address the standard 1M,298C gas phase condition, but I couldn't find any reference for that. Is this so?
You will probably find interesting this report written some years ago by a member of the Gaussian team:
"Thermochemistry in Gaussian", Joseph W. Ochterski, Gaussian Inc., 2000
Freely available as a PDF file at http://web.thu.edu.tw/ghliu/www/pdf/thermo.pdf
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