BDFFRAG is a small tools to generate input for FLMO calculation. BDFFRAG use Guassian input file prepared from Gview to generate FLMO input automatically for BDF. Connectivity information will be used. There are two methods to generate fragments.

We prefer to extend Guassian input. Input format:

#HF 3-21G       

Lines of Guassian input

cutbond    # define which bond will be cut to get atomic groups.
3 C C 1.0 C N 1.5 C O 1.5
centeratom # define center atoms used to generate molecule fragment via K-mean cluster algortim
1  5  9  3
radbuff       # define buffer radius, default 4.5
4.5

To run command

$BDFHOME/sbin/bdffrag.drv inputfile

A file named tmp.inp will be generated. You may modify it by yourself. Good luck!