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1,5-Bis(4-chloro­phenyl)-3-(2-oxo-1,2-dihydro­quinolin-3-yl)pentane-1,5-dione, (Ia), and 1,5-bis­(2-chloro­phenyl)-3-(2-oxo-1,2-dihydro­quinolin-3-yl)pentane-1,5-dione, (Ib), crystallize as an 84:16 mixture, 0.84C26H19Cl2NO3·0.16C26H19Cl2NO3, in the space group I41/a, where the mol­ecules of the two isomers occupy very similar sites in the unit cell. A combination of one N—H...O hydrogen bond and one C—H...O hydrogen bond links the mol­ecules, regardless of isomeric form, into a single three-dimensional framework structure. The mol­ecules of (9RS,10RS)-8,9-bis­(4-chloro­benzyl)-10-(2-oxo-1,2-dihydroquinolin-3-yl)-5,6,9,10-tetra­hydro­phenanthridine, C36H22Cl2N2O4, (II), are linked by two hydrogen bonds, one each of the N—H...O and C—H...O types, into a mol­ecular ribbon in which centrosymmetric rings of R22(18) and R44(24) types alternate. The hydrogen-bonded ribbons enclose channels, which contain highly disordered solvent mol­ecules.
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