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#1 2023-08-29 12:44:00

Zubair Sadiq
Member
Registered: 2023-08-29
Posts: 10

Energy value using Gaussian

Hi. Dear.
I optimized a transition metal complex at two different spin states as Doublet and Quartet using Gaussian UDFT. Now, I want to calculate the energy difference between the two spin states. For this, I could see two energy values E(UB3LYP) as highlighted in yellow in the attached picture. Which energy value should I consider. Either highlighted on the right side or left side of the image. The attached image is screenshot from .log file at doublet state.
Thank You so much
Co1D.jpg

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#2 2023-08-29 14:58:58

sobereva
Tian Lu (Multiwfn developer)
From: Beijing
Registered: 2017-09-11
Posts: 1,639
Website

Re: Energy value using Gaussian

I do not recommend to check result using "Summary" interface of gview, sometimes the data is misleading. For unrestricted B3LYP calculation, always manually check E(UB3LYP) printed last time.

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#3 2023-08-30 01:16:43

Zubair Sadiq
Member
Registered: 2023-08-29
Posts: 10

Re: Energy value using Gaussian

How I can check manually? I didn't get you. Thank you!

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#4 2023-08-30 05:34:16

sobereva
Tian Lu (Multiwfn developer)
From: Beijing
Registered: 2017-09-11
Posts: 1,639
Website

Re: Energy value using Gaussian

Search E(UB3LYP) from end of the file to bottom, then take the value.

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#5 2023-08-31 01:53:39

Zubair Sadiq
Member
Registered: 2023-08-29
Posts: 10

Re: Energy value using Gaussian

Could you please make it little more clearer so I can better understand. Because I can see SCF Done= E(UB3LYP) in various places in .log file. I do not know exactly which E(UB3LYP) is the optimized energy.

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#6 2023-08-31 03:40:25

sobereva
Tian Lu (Multiwfn developer)
From: Beijing
Registered: 2017-09-11
Posts: 1,639
Website

Re: Energy value using Gaussian

E(UB3LYP) is printed in each geometry optimization step. Evidently you should take the final one, which corresponds to optimized structure.

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#7 2023-09-01 01:16:05

Zubair Sadiq
Member
Registered: 2023-08-29
Posts: 10

Re: Energy value using Gaussian

Alright. I get it. Thank You!

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#8 2023-10-28 07:19:19

Zubair Sadiq
Member
Registered: 2023-08-29
Posts: 10

Re: Energy value using Gaussian

Hi! Dear Sir!
Sir, I want to ask something from you if you could find some free time to answer my query. I would be very thankful to you!
I have optimized some transition metal complexes using B3LYP/6-31G* by Gaussian09. I want to calculate descriptors using Codessa software. So, can I directly use output files from Gaussian (.log files) as input files in Codessa for descriptor calculations? If so, then please share some references. I also need to cite Thank you so much for your time.

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#9 2023-10-28 15:51:30

sobereva
Tian Lu (Multiwfn developer)
From: Beijing
Registered: 2017-09-11
Posts: 1,639
Website

Re: Energy value using Gaussian

I don't know, I have never heard of Codessa.

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