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The title compound, C33H24N4, was prepared by the reaction of a bifunctional aromatic diamine (4,4′-diaminodiphenylmethane) and an aldehyde (quinoline-2-carboxaldhyde). The molecule consists of two nearly planar (or r.m.s. deviation = 0.017 Å) 4-methyl-N-[(E)-quinolin-2-ylmethylidene]aniline moieties, which are linked by the methylene group. The angle between the mean planes of the two benzene rings connected to the methylene group is 77.86 (11)°.

The title Schiff base compound, C32H22N4O, was prepared by a reaction of 4,4′-diaminodiphenyl ether and 2-quinolinecarboxaldehyde. The molecule consists of two 4-{N-[(E)-quinolin-2-ylmethylidene]amino}phenyl units linked by an oxygen bridge. The dihedral angles between two benzene rings and between the two quinoline ring systems are 53.81 (7) and 42.56 (4)°, respectively. Intermolecular C—H...N hydrogen bonding is present in the crystal structure.

The title Schiff base compound, C(32)H(22)N(4)O, was prepared by a reaction of 4,4'-diamino-diphenyl ether and 2-quinoline-carboxaldehyde. The mol-ecule consists of two 4-{N-[(E)-quinolin-2-yl-methyl-idene]amino}-phenyl units linked by an oxygen bridge. The dihedral angles between two benzene rings and between the two quinoline ring systems are 53.81 (7) and 42.56 (4)°, respectively. Inter-molecular C-H⋯N hydrogen bonding is present in the crystal structure.

The title compound, C(33)H(24)N(4), was prepared by the reaction of a bifunctional aromatic diamine (4,4'-diamino-diphenyl-methane) and an aldehyde (quinoline-2-carboxaldhyde). The mol-ecule consists of two nearly planar (or r.m.s. deviation = 0.017 Å) 4-methyl-N-[(E)-quinolin-2-yl-methyl-idene]aniline moieties, which are linked by the methyl-ene group. The angle between the mean planes of the two benzene rings connected to the methyl-ene group is 77.86 (11)°.