A chain of edge-fused rings generated by the combination of an N-H...O hydrogen bond and an iodo-nitro interaction in 2-iodobenzaldehyde 4-nitrophenylhydrazone versus disordered and effectively isolated molecules in 2-iodobenzaldehyde 2,4-dinitrophenylhydrazone.
Source:http://linkedlifedata.com/resource/pubmed/id/12711775
