I drew a structrue with a pyridine coordinated to Pt (coordinating atom: N). When I put the structure into Chem3D it always showed a lone pair on N which should not exist. I changed the bond between N and Pt to a dative bond and then did MM2 calculation to get the configuration, but when the calculation started it changed the dative bond to a single bond automatically and the lone pair appeared again. What can I do to delete the lone pair on N?
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