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#1 Re: Multiwfn and wavefunction analysis » How to: ESP values and input file creation for newbie » 2023-05-04 07:40:15

What is the outputted unit for those Mulliken-Charges? a.u.? To what is it related?

Thank you!

#2 Re: Multiwfn and wavefunction analysis » How to: ESP values and input file creation for newbie » 2022-04-30 11:15:19

Thank you! I guess I have to switch over to Multiwfn program.
After I had a look at all ESP at nuclear position for two molecules, it turned out that those values were almost identical for the isomers of 1,2- and 1,4-Dihydroxybenzene:
    1,2-DHB    1,4-DHB
a1    -14.77    -14.71
a2    -14.77    -14.76
a3    -14.72    -14.76
a4    -14.72    -14.71
a5    -14.77    -14.76
a6    -14.77    -14.76
a7    -1.1            -1.1
a8    -1.09    -1.09
a9    -1.09    -1.09
a10    -1.1           -1.09
a11    -22.35    -22.34
a12    -0.99    -0.99
a13    -22.34    -22.34
a14    -0.98    -0.98

This surprises me a bit, as I expect the electron density at the aromatic carbons to be way more different because of electron donating groups. Is there another property to look for with Multiwfn?

#3 Re: Multiwfn and wavefunction analysis » How to: ESP values and input file creation for newbie » 2022-04-30 08:15:58

Thank you very much for this example.
I did exactly this but I got only negative ESP values. I expected to get also positive ones from those calculations as I did with the GFN1-xTB method (see screen above).
I'd like to evaluate the polar/non-polar character of small aromatic drug molecules and the sum of negative values gave me the correlation I was looking for (from GFN1-xTB method). Iam a bit curios right now. Maybe I have to modify the isovalue?

Thank you!

#4 Re: Multiwfn and wavefunction analysis » How to: ESP values and input file creation for newbie » 2022-04-29 09:33:26

Thanks for your fast reply!
I did finally manage to create the .molden file with ORCA.
Now, Iam interested in gaining the electrostatic potential at nucleus position. How do I get those values? I'd like to verify my results calculated with another software.

entos-envision.jpg

Which values from Multiwfn are comparable to those gained from Envision by Entos? They state the displayed values are "Electrostatic potential at nuclear centers".



Thank you in advance!

#5 Multiwfn and wavefunction analysis » How to: ESP values and input file creation for newbie » 2022-04-27 19:30:47

Dialin
Replies: 11

Hello,
I do need to calculate the molecular electrostatic potentials for different aromatics at nucleus position. Therefor, at first I need to generate the .wfn file as I read. How exactly is the right order to do that, as Iam new to computational chemistry. Can I draw a molecule in WebMO, then somehow export that file to what? ORCA? Where calculation begins?

Thanks in Advance!

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