Just to add to Cristobal's comment; once you have two structures on the screen use Calculate\Molecule Overlay then pick an atom in each structure to be overlaid. Alternatively you can use Calculate\Structure Overlay and choose which atoms in each structure you want to overlay.
A further comment; for large structures it gets a bit messy looking at two structures on top of each other. You might wish to colour by molecule to help see which is which! Hope that helps.
There is a youtube video on how to do it here;
http://www.youtube.com/watch?v=uNxqYKx2tqk
Or see sections 4.3 and 4.4 of the manual here:
http://www.ccdc.cam.ac.uk/Lists/DocumentationList/mercury.pdf?productname=Mercury
Enjoy!
At the right bottom, you can see, below the tree view, a check that says "multiple structures", check it, and select as much structures as you want in the tree view, you will see them overlaid.
Regards
Just to add to Cristobal's comment; once you have two structures on the screen use Calculate\Molecule Overlay then pick an atom in each structure to be overlaid. Alternatively you can use Calculate\Structure Overlay and choose which atoms in each structure you want to overlay.
A further comment; for large structures it gets a bit messy looking at two structures on top of each other. You might wish to colour by molecule to help see which is which! Hope that helps.
There is a youtube video on how to do it here;
http://www.youtube.com/watch?v=uNxqYKx2tqk
Or see sections 4.3 and 4.4 of the manual here:
http://www.ccdc.cam.ac.uk/Lists/DocumentationList/mercury.pdf?productname=Mercury
Enjoy!
In the full version of Mercury that you get when you buy a licence tp the Cambridge Structural Database in the structural navagator window at the bottom there is a box that says Mulitple structures and you need to check this box and then you can import more than one .cif or .res file. It has near features if you go into Calculate and then molecule overlay you can overlay two or more molecules on top of each other, I find that useful. Its unfortunate that this option is not available on the free download version.
I don't know if you solved the problem but you can get the same result without paying any dime.
A good program to do the same is the MoleKel 4.3. This old version works fine also under windows 7 where I currently use it. It allows you to ovelap two molecules and compare them. It accepts as input many formats including xyz.
You can find the differen version of the program here
ftp://ftp.cscs.ch/out/molekel/molekel_4.3/
I think it has one of the best rendering for molecules.
enjoy !
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