Nevzat Karadayı

1-Acetyl-5-ferrocenyl-3-phenyl-2-pyrazoline.

In the title compound, [Fe(C5H5)(C16H15N2O)], the pyrazoline ring and the phenyl ring are nearly coplanar, making a dihedral angle of 6.54 (2)°, while the substituted cyclopentadienyl ring is twisted out of the pyrazoline ring plane by 81.32 (1)°. The molecules in the crystal structure are held together by weak C—H⋯O intermolecular hydrogen bonds and two C—H⋯π interactions.

Spectroscopic and structural studies of 6,6′-bis(N-methylhydrazine)-2,2′-bipyridine and its mononuclear copper(II) complex

The tetradentate ligand, 6,6′-bis(N-methylhydrazine)-2,2′-bipyridine (L) and its mononuclear copper(II) complex [Cu(L)](ClO4)2] (1) have been synthesized and characterized. The crystal structures of L and 1 have been determined by single-crystal X-ray diffraction. Both crystallize in the centrosymmetric monoclinic space group with crystallographic inversion symmetry. The ligand adopts a planar transoid configuration in the solid state. In 1, the Cu(II) is six-coordinate octahedral, defined by N4O2 donors from ligand and two perchlorates. The molecular units are connected by intermolecular H-bonds between the hydrazino group of the one unit and coordinated perchlorate of the neighboring two units via N–H ··· O to furnish a 2-D network. Coordinated perchlorates also form an intramolecular H-bond with hydrazine influencing the crystal packing.

1-Acetyl-3-ferrocenyl-5-(2-nitro­phen­yl)-2-pyrazoline

In the title compound, [Fe(C5H5)(C16H14N3O3)], the pyrazoline ring and the substituted cyclopentadienyl ring are nearly coplanar, with a dihedral angle of 8.17 (2)°, while the nitro-substituted benzene ring is twisted out of the pyrazoline ring plane by 70.76 (1)°. The molecules in the crystal structure are held together by three intermolecular C—H⋯O hydrogen bonds. There is also an intramolecular C—H⋯N hydrogen bond. The H atoms of the methyl group are disordered equally over two positions.

2-{[3-Chloro-4-(4-chloro­phen­oxy)phen­yl]imino­meth­yl}-4-nitro­phenol

In the title compound, C19H12Cl2N2O4, the imine bond length of 1.257 (6) Å is typical of a double bond. The dihedral angle between the para-nitro benzene ring and the central benzene ring is 12.06 (3)° and that between the central benzene and the para-chloro benzene ring is 73.81 (2)°. An intramolecular O—H⋯N hydrogen bond generates an S(6) ring motif. In the crystal, molecules are linked together by two pairs of C—H⋯O interactions (to the same O atom acceptor), forming inversion dimers. A short Cl⋯Cl contact [3.232 (4) Å] is observed.

N‐[3,5‐Bis­(tri­fluoro­methyl)­phenyl]­salicyl­ald­imine

The title compound, C15H9F6NO, is non-planar with a dihedral angle between the two aromatic rings of 29.57 (2)°. The central N=C bond distance of 1.276 (4) A is typical for a double bond. There are intramolecular O—H⋯N and weak intermolecular C—H⋯F hydrogen bonds.

Crystal structure of 2-{[2-meth­oxy-5-(tri­fluoro­meth­yl)phen­yl]iminomethyl}-4-nitro­phenol

In the title compound, C15H11F3N2O4, the N=C bond of the central imine group adopts an E conformation. The dihedral angle between two benzene rings is 6.2 (2)°. There is an intramolecular bifurcated O—H⋯(N,O) hydrogen bond with S(6) and S(9) ring motifs. In the crystal, molecules are linked by C—H⋯O hydrogen bonds into a helical chain along the 31 screw axis parallel to c. The –CF3 group shows rotational disorder over two sites, with occupancies of 0.39 (2) and 0.61 (2).

Bis(2,6-diamino-pyridinium)-adipate-adipic acid-water (2/1/1/2).

The crystal structure of the title compound, 2C5H8N3 +·C6H8O4 2−·C6H10O4·2H2O, consists of aminopyridinium cations, adipate dianions, adipic acid molecules and disordered solvent water molecules [occupancies 0.50 (4) and 0.50 (4)]. Both the adipate and adipic acid are located across inversion centres. Eight-membered hydrogen-bonded rings exist involving aminopyridinium and adipate ions. Adipic acid molecules and adipate anions are linked into zigzag supramolecular chains by O—H⋯O hydrogen bonds.

N,N'-bis[1-(pyrazin-2-yl)ethylidene]hydrazine.

Molecules of the title compound, C12H12N6, contain both a diimine linkage and an N-N bond, and assume a planar structure. The compound lies about an inversion centre and there are three intramolecular C-H...N hydrogen bonds.