1,3-Bis(1H-benzimidazol-2-yl)-2-oxapropane

The title molecule, C16H14N4O, lies on a crystallographic inversion center. The –CH2– groups and the O atom are disordered over two sites with equal occupancy, the disorder of the O atom being symmetry imposed. In the crystal structure, mol­ecules are linked into a two-dimensional network parallel to (001) via inter­molecular N—H⋯N hydrogen bonds

2,2′-(Imino­dimethyl­ene)dibenz­imid­azol­ium bis­(perchlorate) methanol solvate

In the title compound, C16H17N5 2+·2ClO4 −·CH3OH, the dihedral angle between the two benzimidazolium ring systems is 34.6 (1)°. The anions and solvent mol­ecules are linked to the cation by N—H⋯O hydrogen bonds. In the crystal structure, the combination of N—H⋯O and O—H⋯O hydrogen bonds results in two-dimensional layers running parallel to the (010) plane; these are in turn linked by π–π inter­actions, forming a three-dimensional network