Crystal structures of three ortho-substituted N-acyl-hydrazone derivatives

Crystal structures of three N-acyl-hydrazone isomers

The crystal structures of three isomers of (E)-4-chloro-N-{2-[2-(chloro-benzyl-idene)hydrazin-yl]-2-oxoeth-yl}-benzene-sulfonamide, namely, (E)-4-chloro-N-{2-[2-(2-chloro-benzyl-idene)hydrazin-yl]-2-oxoeth-yl}-benzene-sulfonamide (I), (E)-4-chloro-N-{2-[2-(3-chloro-benzyl-idene)hydrazin-yl]-2-oxoeth-yl}-benzene-sul-fon-amide (II) and (E)-4-chloro-N-{2-[2-(4-chloro-benzyl-idene)hydrazin-yl]-2-oxo-eth-yl}-benzene-sulfonamide (III), with the general formula C15H13Cl2N3O3S are described, with the chloro group in ortho, meta and para positions in the benzyl-idene benzene ring. All the three isomeric compounds crystallize in the centrosymmetric triclinic P space group with one mol-ecule each in the asymmetric unit and two mol-ecules in the unit cell. The dihedral angles between the two phenyl rings are 11.09 (14), 53.79 (18) and 72.37 (11)° in (I), (II) and (III), respectively. The central part of the mol-ecule (-C-N-N=C-) is almost linear with C-N-N-C torsion angles of 179.1 (2), -169.5 (3) and 178.5 (2)° for (I), (II) and (III), respectively. In all the three crystals, the mol-ecules form inversion dimers with R 2 2(8) ring motifs, which are further augmented by C-H⋯O inter-actions.

Crystal structures and Hirshfeld surface analyses of a des-A-B-aromatic steroidal compound, and two of its derivatives, having a trans-2,3,4,5-tetrahydro-3a-methyl-7-methoxybenz[e]indane skeleton – structural comparisons with reported tetrahydrobenz[e]indene derivatives

The crystal structures and Hirshfeld surface analyses of the des-A-B-aromatic steroid derivative, (3a,9b)-1,2,3a,4,5,9b-hexahydro-7-methoxy-3a-methyl-3H-benz[e]-inden-3-one (or 5-methoxy-des-A-estra-5,7,9-triene-17-one) 1, its acetohydrazide derivative, 2, and its hydrazone derivative, 3, are reported. All three compounds crystallize in chiral space groups: compounds 1 and 2 in the orthorhombic space group P212121 each with one molecule in the asymmetric unit, and compound 3 in the monoclinic space group P21 with two similar but independent molecules, Mol A and Mol B, in the asymmetric unit. Both the five-membered and six-membered non-aromatic rings in all three compounds have envelope or near envelope shapes. In compounds 2 and 3 the N=N units have (E)-arrangements. The intermolecular interactions in crystals of compound 1 are C–H · · · O hydrogen bonds and C–H · · · π interactions, in compound 2 N–H · · · O and C–H · · · O hydrogen bonds and C–H · · · π interactions are present, while in compound 3 there are just C–H · · · π interactions. An important substructure in 1 is a sheet of molecules, composed of R 6 6 ( 44 ) ${\rm{R}}_6^6(44)$ rings, formed from C–H · · · O(methoxy) and C–H · · · O(carbonyl) hydrogen bonds, the molecules of which form columns linked via the B and D rings, i.e. in a head-to-tail fashion. Compound 2 is an acylhydrazonyl compound, in which the two independent molecules are linked into asymmetric dimers via strong classical N–H · · · O hydrogen bonds, with the formation of R 2 2 ( 8 ) ${\rm{R}}_2^2(8)$ rings. In both 1 and 2, further intermolecular interactions result in 3-dimensional structures, while compound 3 has a 1-dimensional structure arising from C–H · · · O interactions generating spiral chains. The results have been compared with existing data.

Crystal structure and Hirshfeld surface analysis of (E)-N'-[4-(piperidin-1-yl)benzyl-idene]aryl-sulfono-hydrazides

The crystal structures and Hirshfeld surface analyses of three Schiff bases, namely (E)-N'-[4-(piperidin-1-yl)benzyl-idene]benzene-sulfono-hydrazide, C18H21N3O2S, (I), (E)-4-methyl-N'-[4-(piperidin-1-yl)benzyl-idene]benzene-sulfono-hydrazide, C19H23N3O2S, (II), and (E)-4-chloro-N'-[4-(piperidin-1-yl)benzyl-idene]benzene-sulfono-hydrazide, C18H20ClN3O2S, (III), derived from aryl-sulfono-hydrazides and 4-(piperidin-4-yl)benzaldehyde have been analysed to investigate the effect of substituents on the structural parameters. All three structures crystallize in monoclinic crystal systems, in the space groups P21/c for (I) and (II), and C2/c for (III). Compound (III) contains two independent mol-ecules in the asymmetric unit and sixteen mol-ecules per unit cell, while (I) and (II) both have one and four mol-ecules, respectively, in their asymmetric units and unit cells. In all cases, the central part of the mol-ecule is twisted at the S atom. In the crystals, the mol-ecules are linked via N-H⋯O hydrogen bonds, forming chains. Two-dimensional fingerprint plots of various inter-atomic contacts show that the major contributions are from H⋯H inter-actions.

Comparison of the crystal structures and Hirshfeld surface analysis of five N-(4-methylbenzenesulfonyl)glycine hydrazone derivatives

The crystal structures of N-(4-methylbenzenesulfonyl)glycine hydrazone and four derivatives with four different substituents have been investigated, namely, (E)-N-{2-[2-(benzylidene)hydrazinyl]-2-oxoethyl}-4-methylbenzenesulfonamide, C16H17N3O3S, (I), (E)-N-{2-[2-(4-bromobenzylidene)hydrazinyl]-2-oxoethyl}-4-methylbenzenesulfonamide, C16H16BrN3O3S, (II), (E)-N-{2-[2-(4-chlorobenzylidene)hydrazinyl]-2-oxoethyl}-4-methylbenzenesulfonamide, C16H16ClN3O3S, (III), (E)-N-(2-{2-[4-(dimethylamino)benzylidene]hydrazinyl}-2-oxoethyl)-4-methylbenzenesulfonamide, C18H22N4O3S, (IV), and (E)-N-{2-[2-(4-methoxybenzylidene)hydrazinyl]-2-oxoethyl}-4-methylbenzenesulfonamide, C17H19N3O4S, (V). The molecules in all five crystal structures show similar conformations and hydrogen-bonding patterns. The central part of the molecule, i.e. C—C—N—N=C, is almost linear in all the structures, with the C—C—N—N torsion angles ranging from −178.3 (1) to −180.0 (2)° and the C—N—N=C torsion angles ranging from −178.5 (4) to −179.8 (3)°. The conformation of the N—H and C=O bonds in the amide group of the hydrazone part is syn in all the compounds. In all the structures, sulfonamide and hydrazone dimers with R 2 2(8) ring motifs are observed, which are further augmented by C—H...O interactions. A common feature of each of (I)–(V) is the formation of sulfonamide and hydrazone dimers with an R 2 2(8) ring motif. Hirshfeld surface analyses gave fingerprint plots for H...H, O...H/H...O, N...H/H...N, C...H/H...C and other contacts. The H...H contacts show large surfaces, whereas the O...H plots show the presence of O...H/O...H contacts with the two characteristic long sharp spikes.

Crystal structure and Hirshfeld surface analysis of (E)-4-chloro-N-{2-[2-(4-nitro-benzyl-idene)hydrazin-1-yl]-2-oxoeth-yl}benzene-sulfonamide N,N-di-methyl-formamide monosolvate

The asymmetric unit of the title compound, C15H13ClN4O5S·C3H7NO, contains one mol-ecule each of the Schiff base and the solvent di-methyl-formamide. The hydrazone group adopts an E configuration about the C=N bond. The dihedral angle between the two aromatic rings is 86.58 (2)°. In the crystal, pairs of N-H⋯O hydrogen bonds between centrosymmetrically related mol-ecules generates rings with an R22(10) graph-set motif. The dimers are further linked via N-H⋯O and C-H⋯O hydrogen bonds, leading to the formation of R33(11) ring motifs. C-H⋯π inter-actions are also observed. The inter-molecular inter-actions in the crystal structure were qu-anti-fied and analysed using Hirshfeld surface analysis, which indicates that the most significant contacts in packing are O⋯H/H⋯O (31.3%), followed by H⋯H (25.4%) and C⋯H/H⋯C (13.0%).