Suggestions on Gaussian calculation of Spiro-OMe-TAD

Hello,

I am trying to optimize the structure of the well-known reported molecule Spiro-OMe-TAD, a HTL for solar cells. As reported, it should give zero dipole moment as it has a symmetry structure. But to the surprise, I am getting 0.9575 debye while optimizing in ground state DFT and the obtained HOMO and LUMO diagrams are also not matching with the reported one.

I couldn't figure out the error what might have done. Also, it took very long time for the calculation as I am using my personal computer.

Also, I am attaching my gaussian file here. (.log)

So, It would be great help for me on this regard.

Thanks.

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