Nagihan Çaylak

A Co(III) complex with a tridentate amine-imine-oxime ligand from 1,2,3,4-tetrahydroquinazoline: synthesis, crystal structure, spectroscopic and thermal characterization

A cobalt(III) complex [Co(L)2]Cl · PPO · H2O (1) (HL = 1-(2-aminobenzylimino)-1-phenyl-propan-2-one oxime, PPO = 1-phenyl-1,2-propanedione-2-oxime) has been synthesized and characterized by elemental analyses, spectral, thermal, magnetic and molar conductance measurements and single crystal X-ray diffraction. It crystallizes in the monoclinic crystal system, space group P21/c. Complex 1 consists of one uncoordinated water, one 1-phenyl-1,2-propanedione-2-oxime molecule, one bis[1-(2-aminobenzylimino)-1-phenyl-propan-2-one oxime]cobalt(III) cation and one uncoordinated chloride. The coordination geometry around Co is slightly distorted octahedral, completed with six nitrogens of two L− ligands. The oxime moieties have E configurations. In the crystal structure, intramolecular O–H···Cl and N–H···O and intermolecular N–H···O, O–H···Cl and N–H···Cl hydrogen bonds link the molecules into chains parallel to the c axis; hydrogen-bonded PPO molecules fill the spaces between the chains and stabilization of the structure.

N′-[(E)-Benzyl­idene]-1-ethyl-7-methyl-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carbohydrazide

In the title compound, C19H18N4O2, the 1,8-naphthyridine ring system is essentially planar [r.m.s. deviation = 0.011 (3) Å]. The dihedral angle between the naphthyridine ring system and the phenyl ring is 28.95 (7)°. The carbohydrazide H atom is involved in an intramolecular N—H⋯O hydrogen bond, forming a six-membered hydrogen-bonded ring. In the crystal, the molecules arrange themselves into centrosymmetric dimers by means of intermolecular C—H⋯O hydrogen bonds.

1-Ethyl-N′-[(E)-4-hydroxy­benzyl­idene]-7-methyl-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carbohydrazide

In the crystal structure of the title compound, C19H18N4O3, the fused-ring system is essentially planar [maximum deviation is 0.031 (2) Å] while the dihedral angle between the ring system and the benzene ring is 12.64 (6)°.The carbohydrazide H atom is involved in an intramolecular N—H⋯O hydrogen bond, forming a six-membered hydrogen-bonded ring. The molecules arrange themselves into centrosymmetric dimers by means of intermolecular O—H⋯O hydrogen bonds.

Diaqua­bis(4-bromo­benzoato-κ2O,O′)zinc(II)

The monomeric title ZnII complex, [Zn(C7H4BrO2)2(H2O)2], contains two 4-bromobenzoate (BB) ligands and two coordinated water molecules around a ZnII atom on a twofold rotation axis. The BB ions act as bidentate ligands, with two very dissimilar coordination distances. The sixfold coordination around the ZnII may be described as highly distorted octahedral, with the two aqua ligands arranged cis. Hydrogen bonding involving the carboxylate O atoms has an effect on the delocalization in the carboxylate groups. In the crystal structure, intermolecular O—H⋯O hydrogen bonds link the molecules into chains parallel to the c axis and stacked along the b axis.

Diaqua­bis(4-chloro­benzoato-κO)bis­(N,N-diethyl­nicotinamide-κN1)manganese(II)

The title compound, [Mn(C7H4ClO2)2(C10H14N2O)2(H2O)2], is a monomeric complex with the MnII atom lying on an inversion center. It contains two 4-chlorobenzoate and two diethylnicotinamide ligands and two water molecules, all of which are monodentate. The four O atoms in the equatorial plane around the Mn atom form a slightly distorted square-planar arrangement, while the distorted octahedral geometry is completed by two N atoms in the axial positions. In the crystal structure, O—H⋯O hydrogen bonds link the molecules into an infinite chain.

N-(4-Meth­oxy-2-nitro­phen­yl)-N-(methyl­sulfon­yl)acetamide

In the title compound, C10H12N2O6S, the nitro group is twisted slightly out of the plane of the aromatic ring, forming a dihedral angle of 20.79 (1)°. In the crystal, the molecules arrange themselves as a chain along the a axis through intermolecular C—H⋯O interactions.

Bis(4-fluoro-benzoato-κO,O')bis-(nicotinamide-κN)zinc(II) monohydrate.

The title compound, [Zn(C7H4FO2)2(C6H6N2O)2]·H2O, is a monomeric complex. It contains two 4-fluorobenzoate and two nicotinamide ligands and one uncoordinated water molecule. The 4-fluorobenzoates act as bidentate chelating ligands, while the nicotinamides are monodentate. The six-coordinate geometry around the ZnII atom may be described as highly distorted octahedral, with the two nicotinamide ligands arranged cis. Intermolecular O—H⋯O and N—H⋯O hydrogen bonds link the molecules into a supramolecular structure.

Bis(4-fluoro­benzoato-κ2O,O′)bis­(nicotinamide-κN1)zinc(II) monohydrate

The title compound, [Zn(C7H4FO2)2(C6H6N2O)2]·H2O, is a monomeric complex. It contains two 4-fluorobenzoate and two nicotinamide ligands and one uncoordinated water molecule. The 4-fluorobenzoates act as bidentate chelating ligands, while the nicotinamides are monodentate. The six-coordinate geometry around the ZnII atom may be described as highly distorted octahedral, with the two nicotinamide ligands arranged cis. Intermolecular O—H⋯O and N—H⋯O hydrogen bonds link the molecules into a supramolecular structure.