The title Schiff base compound, C11H9N3O3, was obtained from a condensation reaction of furan-2-carbaldehyde and 2-nitro­phenyl­hydrazine. The mol­ecule is roughly planar, the largest deviation from the mean plane defined by all non-H atoms being 0.097 (4). An in ntra­molecular N—H⋯O hydrogen bond might influence the planar conformation of the mol­ecule. In the crystal, weak C—H⋯O hydrogen bonds link the mol­ecules, forming a chain.

C 21 H 17 N 3 O 2 ,triclinic, P1 (no. 2), a =8.169(1) Å, Source of materialThe title compound was obtained from acondensation reaction of 2-nitrophenylhydrazine and chalcone. 2-Nitrophenylhydrazine (1 mmol, 0.153 g) was dissolved in anhydrous methanol (10 ml), the mixture was stirred for several minitutes at room temperature. Chalcone (1 mmol, 0.208 g) in methanol (5 ml) was added dropwise and the mixture was stirred at refluxing temperature for 4h.The product was separated and recrystallised from methanol, red single crystals of the title compound were obtained after 2d.

C 15 H 13 NO 2 ,triclinic, P1 (no. 2), a =10.697(3) Å, b =10.791(3) Å, c =13.328(3) Å, a =89.39(2)°, b =67.05(2)°, g =62.45(3)°, V =1228.6 Å 3 , Z =4, Source of material]dioxole-5-carbaldehyde (2 mmol, 0.30 g) was dissolved in anhydrous methanol (10 ml), the mixture was stirred for several minitutes at room temperature, p-toluidine (2 mmol, 0.214 g) in methanol (5 ml) was added dropwise and the mixture was stirred at room temperature for 2h.The Schiff base was obtained and reduced with sodium borohydride (5 mmol, 0.185 g), The mixture was stirred for 5hatRT, then evaporated to dryness, the product was recrystallised from methanol, colorless single crystals of the title compound were obtained after 1d. DiscussionThe properties and molecular structure of complexes containing the amine group are of interest as their complexes with transition metal exhibit superior activity as catalysts in polymerizations [1,2]. The asymmetric unit of the title compound is built up from two independent but similar molecules. The title molecule crystallizes in the E conformation in each molecule, with the C9-N1-C8-C1and C24-N2-C23-C16 torsion angles of 172.6(2) and -178.9(2)°,1 ,3-dioxolane ring is almost co-planar with its attached benzene ring [dihedral angle =1 .3(1)°and 3.2(2)°], respectively. Each molecule is not planar, the dihedral angles between the two benzene ring are 42.4(1)°and 19.7(1)°in each molecule, respectively. The N1-C8 and N2-C23 bond distances of 1.273(2) and 1.271(2) Å are typical for the C=N double bond. Classic hydrogen bonds were not observed in the molecule.