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The current version of the CGenFF program at paramchem.org will accept fullerenes, albeit with warnings. As can be read in the change log, the reason for this is that the diameter of the buckyball will be a bit too small; this could be remedied by defining a new atom type, copying all the parameters from CG2R61, then setting the reference value for the bond to 1.42 rather than 1.3750 (with thanks to Christian Schönbeck for pointing this out). We have a separate script for graphene structures but it suffers the same shortcoming when applied to C60.
https://www.charmm.org/ubbthread ... at&Number=34288
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