Hello, I often see these vdW contact distance cut-off numbers (see below) in papers, but no reference was given.
"Contact distances are the following maximum allowed values: C-C, 4.1 Å; C-N, 3.8 Å; C-O, 3.7 Å; O-O, 3.3 Å; O-N, 3.4 Å; N-N, 3.4 Å; C-S, 4.1 Å; O-S, 3.7 Å; N-S, 3.8 Å." I am curious how these numbers were developed. For example, S has a larger vdW radius than C, but the vdW contact cut-offs are the same as for C. Does any one know such an old reference or textbook for these numbers? Thanks Rongjin Guan
