CCL:G: a question about gaussian!





On Thu, Apr 21, 2011 at 9:37 AM, Laleh Rezaei lalerezaei|*|gmail.com <owner-chemistry**ccl.net> wrote:

Sent to CCL by: "Laleh  Rezaei" [lalerezaei,gmail.com]
To whom it may concern,

I am a graduate student of Organic chemistry. I need to work with Gauusian software as part of my project, but I am beginner in this area. I faced a problem and I would be grateful if you could help me.

I have a series of stereoisomers of one compound. I need to calculate their energy to see how stable they relative to each other. I draw the structures in chemdraw and I want to calculate the energy of them. I am not sure if there is any way that I be able to open chemdraw file in gaussian or not?

One of my friend suggested hyperchem for this reason. But when I have coppied my structure in to hyperchem and did optimization, the final structure was not what I put in. And it is important in my case, because I am doing conformational analysis and I want to calculate the field effect energy for each conformer.

It sounds like you don't want to do an optimization here.  There should be an option in Hyperchem to just do a single point calculation, so just choose that one.  Hyperchem is likely much easier to use than Gaussian if you don't have Gaussview.

HTH,
Jason
 

Now, my question is how I can make an input data for gaussian and do the calculation without changing structure of the molecule?

I really appreciate your time and reply in advance.

Sincerely,
Laleh Rezaei



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--
Jason M. Swails
Quantum Theory Project,
University of Florida
Ph.D. Graduate Student
352-392-4032