>I would think they would be better suited to your needs.
>On Mon Jan 19 '15 2:12pm, Enrico wrote
>>Hello to everyone,
>>I'm trying to estimate a trend in the complexation constant of sodium ion with several polycarboxylic ligand in water, i know that i should calculate the dG value of the complex from the G value of the reagents, i read several paper on which they explain the need of corrections that account for the solvatation contribution and for the thermal factor (in order to bring the system from 0 K to 298 K and 1 bar). In order to do that I've found the optimized structure of the participant molecule under PCM solvent modeling and than i run an hessian calculation to obtain the thermochemistry at RT but if i use the gibbs energy that i obtained from the thermochemistry i obtain a positive dG for the complex that do not reflect at all the experimental behavior so now i have some question to which i couldn't find an answer elsewhere:
>>- what is the correct energy value that i have to consider from the firefly output?
>>- what are the correct correction factor (Ezpe,Hcorr,Scorr,solvent) that i need to get a formally correct dG for the complexation reaction?
>>solved these basic issues, in your opinion is it better to take into account explicitly the first solvatation sphere of the sodium ion (6 water molecules)?
>>you can find attached a set of output file for the smaller complex of my serie,