Dear Md. Sajid Hasan,

You can draw the structure with the dotted lines containing the charges. Otherwise, the output optimized file will treat it as a single bond.

Dear Soumik De,

Thank you very much for your reply.

I would like to know is it possible to assigne charge on atom in gaussian? I during calculations it is possible to assign total molecule charge. If you idea please share.

Thank you for your time.

Dear Sajid,

Should I avoid Cl atom from my structure?

If you do: you must specify charge +1 for R4N+

If you don't: the molecule is neutral (I suggest this one)

Should I join Cl by dotted line?

Actually, it doesn't matter, since you are going to optimize. However, I suggest to put chloride at 1.75 A near N (ammonium)

Tip: Don't worry for GaussView (or other visualizer) bond drawing. The real bond analysis is made by inspecting molecular orbitals, bond orders, etc.

However, you should put atom-atom distances appropriately, (e.g., C-C at 1.5 A, which is default in QM visualizers)

Should I just join 5 bond with N atom?

See previous reply, the code will optimize it!

I would like to know is it possible to assigne charge on atom in gaussian?

Yes, but you are not interested in such type of calculations. Just run the optimization and the charges in atoms will be automatically calculated (population analysis).

Best, Pablo

Dear Pablo Mtz sir

Thank you so much. Your tips is really awesome. I am grateful to you.

Regards