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I'm trying to generate a figure for a physics textbook to show examples of the vector addition of dipole moments in small molecules. For this purpose, I would like to render pictures of a bunch of small molecules, such as CS2, formaldehyde, benzene, SF6, and chloroform. I've got avogadro running on my linux box, but I'm finding it very time-consuming and confusing to construct the molecules using the GUI. Is there anywhere that I could find pre-made CML files for small molecules like these?

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    $\begingroup$ Do you have access to chemoffice? Chem3D can produce 3D structures from formulas and if you run the optimization in there it should be good enough for this application. Other than that: how many molecules are we speaking about? With the right software making each of those takes less than a minute each including low level geometry optimization. If it's not too many I'm happy to help, we can speak in chat. Another option: you can open the 3D model in jmol from their wikipedia page and extract the *.mol file which to my knowledge can be opened by Avogadro. $\endgroup$ – DSVA Nov 5 '17 at 0:37
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    $\begingroup$ @DSVA: Thanks for the ideas, and for the offer of help. This pointed me to the info that I'll give in an answer to my own question. $\endgroup$ – Ben Crowell Nov 5 '17 at 1:43
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DSVA's comment pointed me to a database that contains the information I need. The wikipedia articles contain links to an app called jsmol, but that app appears to be getting its data from a database called ChEBI. You can search the database using search terms such as "formaldehyde" or "sf6." The entry for each molecule contains a link to a .mol file, which avogadro can read.

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Another location, if you're ok with the mol2 format (which Avogadro can open), PQR has links to download structures on every page. For example, on the cadaverine page:

enter image description here

This will trigger a browser download dialog box for a mol2 file.

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