Abstract: | A new polymorph of di‐2‐pyridyl ketone 4‐nitrophenylhydrazone alternative name: N‐(dipyridin‐2‐ylmethylene)‐N′‐(4‐nitrophenyl)hydrazine], C17H13N5O2, isolated from the filtrate of a sonicated acetonitrile solution of dpknph and CdCl2, was found to crystallize in the monoclinic space group P21/c, in contrast to the known form which crystallizes in P21/n. The non‐coplanar molecules pack in parallel stacks without any intermolecular hydrogen‐bonding interactions. This packing pattern contrasts with the interlocked interdigitated packing seen in the previously known polymorph. |