Crystal structure of (E)-N'-((7-(diethylamino)-2-oxo-2H-chromen- 3-yl)methylene)-2-hydroxybenzohydrazide, C21H21N3O4

Abstract

C 21 H 21 N 3 O 4 ,monoclinic, P12 1 /c1(no. 14), a =10.075(2) Å, Source of materialAm ixture of equivalent amounts of 2-hydroxybenzohydrazide (60.8 mg, 0.4 mmol) and 7-(diethylamino)-2-oxochroman-3-carbaldehyde (98.8 mg, 0.4 mmol) in ethanol (20 ml) was refluxed for 8h,and then was filtered and dried after cooling. The title compound was recrystallized from ethanol in 89 %y ield (135.1 mg). Block-like yellow single crystals were obtained after slowly evaporating of ethanol solution of the title compound. Experimental detailsPositions of the C-bonded hydrogen atoms were calculated (riding model) with U iso fixed at 1.2 or 1.5 Ueq of the corresponding carbon atom. The hydrogen atoms of the imine and hydroxyl group were firstly found in difference Fourier maps and then included in the refinement as riding with U iso(H) fixed at 1.5 U eq (N,O).