With regard to the hydrogen bonding in complexes of pyridylureas, less is more. a role for shape complementarity and CH...O interactions?
A pyridylurea.tetraazaanthracenedione complex with three hydrogen bonds is more stable than an analogous complex with four hydrogen bonds. An X-ray analysis and modeling suggests a steric mismatch destabilizing the latter and a CH...O contact enhancing the stability of the former.
Quinn
Jordan R
JR
Department of Chemistry, 600 South Mathews Avenue, University of Illinois, Urbana, Illinios 61801, USA.
Zimmerman
Steven C
SC
D000880:Anthraquinones / Q000737:chemistry*; D006860:Hydrogen Bonding; D015394:Molecular Structure; D014508:Urea / Q000031:analogs & derivatives / Q000737:chemistry*
D000880:Anthraquinones; D014508:Urea