Re: [ccp4bb] restraints for 4Fe4S in shelxl

2009-03-13 Thread George M. Sheldrick
Dear Guenter, There is a very convenient option in SHELXL for cases like this where it is reasonable to assume that some distances are equal but one does not know how long they are: the SADI equal distance restraint. For an Fe4S4 cluster this might look like: SADI_FS4 0.02 Fe1 S2 Fe1 S3 Fe1 S4

[ccp4bb] restraints for 4Fe4S in shelxl

2009-03-11 Thread Guenter Fritz
Dear All, I am looking for a set of suitable restraints for 4Fe4S clusters in shelxl refinement (the PRODRG server does not like Fe). So far I have put there distance restraints. Has somebody experience with angle restraints for the 4Fe4S clusters? Thanks, Guenter