User ec839d1ceb
06-06-2014 02:21:32
Dear
experts
I
want to calculate pKa values of planar (trans) and non-planar (cis) types of a
molecule.
But
when I make the structure from IUPAC name (Marvin sketch) and calculate pKa
values, the pKa values predicted by Marvin are the same. But I consider that
these two values should be different.
I
have stable structures which are calculated by GAMESS. Can I use these coordinates
for Marvin?
I want to know the procedure to put the coordinates obtained by
GAMESS into Marvin to obtain pKa values.
I
also want to calculate pKa values of a molecule in various solvent.
There
is another problem.
When
I select [calculation] and click [pKa], there comes "a license is not
found and this is evaluation mode" in the PC window, and after I push OK
button, the calculated values of pKa come out (Marvin Sketch).
Am
I doing a correct procedure?
How
can I set a license file for the academic license?
Thanks
a lot in advance.
User 851ac690a0
12-06-2014 13:57:52
Hi,
Yes you are right , the cis and the trans isomers have to have different pKa values.
I am working on this now. On the first attached figure the "cis" and the "trans" isomers are drawn in the MarvinSketch. The calculated pKa values are different for the two isomers. These are not the correct values yet.
The improvement will be available in the 6.4 version.
Could you save your 3D structure created in GAMESS in a known file format like the "sdf" for example?
I attached 3 more files about the "sdf" file / structure of the "cis" isomer generated by Marvin's 3D cleaner.
The solvent effect on the pKa is a planned feature which will be implemented in the near future.
Your licence question will be answered by one of my colleague.
Jozsi
User ec839d1ceb
13-06-2014 03:00:09
Hi, Jozsi
Thank you.
I am looking forward to use 6.4 Version. I would like to calculate the pKa of Methyl Red.
Unfortunately, I do not know the "sdf" format, so I attach the pdf file of structure calculated by GAMESS ( the view is made by Winmoster )
Many many thanks.
atsuko