Comparison of the structure of (E)-2-(2-benzylidenehydrazinylidene)quin­oxaline with those of its chloro- and bromobenzylidene analogues

The structures of (E)-2-(2-(phenylidene)hydrazinyl)quinoxaline and six Cl and Br derivatives have similar supramolecular structures involving an N-H...N hydrogen bond and [pi]-[pi] stacking interactions.

Two polymorphs of N-(2-meth­oxy­phen­yl)-4-oxo-4H-chromone-3-car­box­amide

Two polymorphs of N-(2-meth­oxy­phen­yl)-4-oxo-4H-chromone-3-car­box­amide crystallise in the monoclinic space group P2₁/c, each with two molecules in the asymmetric unit. The conformations of all four molecules are similar, the main differences being in their supramolecular interactions.