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Calculating transition state in Gaussian

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n48102:
Hi all,

I am relatively new to Gaussian, and am attempting to calculate the transition state for a simple cis to trans isomerization reaction--no catalyst, no solvent. I have not had any luck with the opt=ts approach or the QST2 algorithm. I would have tried using the QST3 algorithm, but I cannot seem to generate a reasonable TS guess (that is, a structure with one negative force constant) to input along with the cis and trans conformer. Any tips are greatly appreciated!

mikeB:
Maybe you should do the relax scan for the angle defined by the double bond and substituent you move from cis to trans configuration? Use the structure at the maximum as your guess for the TS.

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