Increasing the landscape of structural motifs in co-crystals of resorcinols with ditopic aromatics:: A one-dimensional π-stacked hydrogen-bonded polymer involving a phenanthroline

Co-crystals involving 4,6-dichlororesoreinol (4,6-diCl-res) and 2,9-phenanthroline (2,9-phen) of composition 2(4,6-diCl-res).2(2,9-phen).(nitromethane) (1) reveal a previously unobserved one-dimensional structural motif that involves a pi-stacked columnar polymer held together by O - (HN)-N-... hydrogen bonds. Each resorcinol participates in short Cl(...)0 contacts and (ClCl)-Cl-... forces along the polymer backbone. The included nitromethane solvent molecules pack in columns held together by C - H(...)0 forces.