(E)-N'-(Furan-2-ylmethyl-ene)-4-(quinolin-8-yl-oxy)butanohydrazide

Crystal structure of (8-hydroxy-5-nitroquinolinium) perchlorate – 8-hydroxy-5-nitroquinoline (1/1), C18H13ClN4O10

C18H13ClN4O10, monoclinic, P21/c (no. 14), a = 21.009(9) Å, b = 9.474(4) Å, c = 9.747(4) Å, β = 98.360(9)°, V = 1919.4(14) Å3, Z = 4, R gt(F) = 0.0560, wR ref(F 2) = 0.1752, T = 293 K.

(E)-N′-(4-Nitrobenzylidene)-4-(8-quinolyloxy)butanohydrazide

In the title compound, C₂₀H₁₈N₄O₄, conformation along the bond sequence linking the benzene and quinoline rings, which have a mean inter­planar dihedral angle of 2.7 (5)°, is trans–(+)gauche–trans–trans–(−)gauche–trans–trans. In the crystal structure, a pair of inter­molecular N—H⋯O hydrogen bonds links the mol­ecules into centrosymmetric cyclic R₂²(8) dimers, which are aggregated via π–π inter­actions into parallel sheets [quinoline–benzene ring centroid separation = 3.6173 (16)–3.6511 (16) Å]. The sheets are further connected through weak C—H⋯O inter­actions, giving a supra­molecular two-dimensional network.

(E)-N′-(5-Chloro-2-hydroxybenzylidene)-4-(8-quinolyloxy)butanohydrazide monohydrate

The crystal of the title Schiff base compound, C₂₀H₁₈ClN₃O₃·H₂O, was twinned by a twofold rotation about (100). The asymmetric unit contains two crystallographically independent mol­ecules with similar conformations, and two water mol­ecules. The C=N—N angles of 115.7 (6) and 116.2 (6)° are significantly smaller than the ideal value of 120° expected for sp²-hybridized N atoms and the dihedral angles between the benzene ring and quinoline ring system in the two mol­ecules are 52.5 (7) and 53.9 (7)°. The mol­ecules aggregate via C—Cl⋯π and π–π inter­actions [centroid–centroid distances = 3.696 (5)–3.892 (5) Å] and weak C—H⋯O inter­actions as parallel sheets, which are further linked by water mol­ecules through N—H⋯O and O—H⋯O hydrogen bonds into a supra­molecular two-dimensional network.

(E)-N'-(4-Pyridylmethyl-ene)-4-(8-quinol-yl-oxy)butanohydrazide 0.25-hydrate

The asymmetric unit of the title compound, C₁₉H₁₈N₄O₂·0.25H₂O, contains two organic mol­ecules and a solvent water mol­ecule with 50% occupancy. The two molecules differ in their conformations: in one mol­ecule it is (+)gauche-trans-trans-(+)gauche-trans, whereas in the other it is (−)gauche-trans-trans-(−)gauche-trans. The dihedral angles between the pyridine ring and the quinoline ring system are 67.4 (3) and 68.0 (2)°. Mol­ecules are linked into a supra­molecular two-dimensional array via N—H⋯N hydrogen bonds, with each partially occupied water mol­ecule connected via an O—H⋯O hydrogen bond. C—H⋯O inter­actions are also present.