CCL:G: Antiferromagentism of dinulear transition metal complexes



Dear Dr. Neese and all

Thanks for your reply. I am Gaussian user, so could I calculate the broken symmetry state using Gaussian 09. If yes please give a hint about the recipe.

On the other hand, the experiment told us that the complex is antiferromagentic. So do I need to determine which the broken symmetry state for this molecule or work directly as antiferromagentic state?

Thanks in advance
Sayed

--- On Wed, 11/10/10, Frank Neese neese_-_thch.uni-bonn.de <owner-chemistry * ccl.net> wrote:

From: Frank Neese neese_-_thch.uni-bonn.de <owner-chemistry * ccl.net>
Subject: CCL: Antiferromagentism of dinulear transition metal complexes
To: "Mesa, Sayed " <elsayed.elmes * yahoo.com>
Date: Wednesday, November 10, 2010, 2:36 PM


Sent to CCL by: Frank Neese [neese!=!thch.uni-bonn.de]
Dear Sayed,

> I have to start with the optimized geometry of septet state, right?.
> yes
>
> Then divide the complex into three fragments (Co1, Co2 and the ligand). The charge and multiplicities will be:
> 4 1, 2 3, 2 -3, 0 1 respectively.  where
>
> 4 1 charge and multiplicity of  the whole complex
> 2 3 charge and multiplicity of  Co2+ with three alpha electron spin
> 2 -3  charge and multiplicity of  Co2+ with three beta  electron spin
> 1 0  charge and multiplicity of  the ligand
>
> Is this scenario is right or not?
>

No, it is not correct. You simply state

%scf brokensym 3,3 end

and the program will (hopefully) find the correct broken symmetry state. Good luck!
Best regards,
FN



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