A new azomethine compound 4-methyl-N-[2-pentafluorophenyliminomethyl)phenyl]methylbenzenesulfamide and a Cu(II) complex based on it are obtained and characterized by 1H NMR, IR spectroscopy and the elemental analysis. Crystal structures of azomethine and its complex are analyzed by single crystal X-ray diffraction (XRD). From the single crystal XRD data it is found that the Cu(II) complex crystallizes in the triclinic space group P1̅ . The unit cell contains two crystallographically independent mononuclear molecules with similar geometries. In the complex, copper ions have a distorted tetrahedral environment of four nitrogen atoms, which is formed by two bidentate coordinated azomethine ligands. From magnetic measurements it is found that the Cu(II) complex is paramagnetic.

A number of new copper(II) complexes of 2-(N-tosylamino)benzaldehyde benzoylhydrazone (H2L) CuLLn (n = 1–6) with heterocyclic donor ligands (L1 = 1-propyl-2-aminobenzimidazole, L2 = 1‑hexyl-2-aminobenzimidazole, L3 = 1-octyl-2-aminobenzimidazole, L4 = 2,2'-bipyridine, L5 = 1,10-phenanthroline, and L6 = 2-aminopyridine) is synthesized. The structures and compositions of the synthesized compounds are determined by elemental analysis, 1Н NMR spectroscopy, IR spectroscopy, and magnetochemistry. The molecular structures of complexes CuLL1,2,4−6 are determined by XRD (CIF files CCDC nos. 2341480 (CuLL1), 2341468 (CuLL2), 2341478 (CuLL4), 2341477 (CuLL5), and 2341479 (CuLL6)). The biological activity of the complexes is studied. The adducts with L1, L2, and L6 exhibit a significantly higher anti-protist activity than chloroquine used as the reference compound.

Новые азометиновое соединение 4-метил-N-[2-(пентафторфенилиминометил)фенил]метилбензолсульфамид и комплекс Cu(II) на его основе получены и охарактеризованы методами 1Н ЯМР, ИК-спектроскопии и элементного анализа. Кристаллическая структура азометина и его комплекса изучены методом рентгеновской монокристальной дифракции. По данным РСА установлено, что комплекс Cu(II) кристаллизуется в триклинной пространственной группе Р–1, элементарная ячейка содержит две кристаллографически независимые моноядерные молекулы с близкой геометрией. Ионы меди в комплексе имеют искаженное тетраэдрическое окружение из четырех атомов азота, сформированное двумя бидентатно координированными азометиновыми лигандами. По данным магнетохимических измерений установлено, что комплекс Cu(II) является парамагнитным.

Осуществлен синтез комплекса Co(II) на основе 1-{1-[2-(о-толилокси)этил]-1Н-бензимидазол-2-ил}этан-1-ола. Методами элементного анализа и ИК спектроскопии установлено, что состав комплекса кобальта [Co(L)3]2+·2(NO3)–·2H2O·2CH3OH. Его кристаллическое строение определено методом рентгеноструктурного анализа монокристалла. Из данных РСА установлено, что комплекс кристаллизуется в моноклинной пространственной группе P21/c. В моноядерной молекуле комплекса к катиону Co(II) координированы три хелатных лиганда атомами O гидроксильной группы и атомами N имидазольного цикла. Координационное окружение атома кобальта CoN3O3 соответствует искаженному октаэдру.

A Co(II) complex with 1-{1-[2-(o-tolyloxy)ethyl]-1H-benzimidazol-2-yl}ethan-1-ol is prepared. It is established by elemental analysis and IR spectroscopy that the composition of the complex is [Co(L)3]2+·2(NO3)–·2H2O·2CH3OH. Its crystal structure is determined by single-crystal XRD. According to the XRD data, the complex crystallizes in the monoclinic space group P21/c. In the mononuclear molecule of the complex, three chelate ligands are coordinated to the Co(II) cation by the O atoms of the hydroxyl group and the N atoms of the imidazole ring. The coordination environment of the cobalt atom CoN3O3 corresponds to a distorted octahedron.

Осуществлен синтез двух комплексов Co(III) на основе 2-{(E)-[2-(гидрокси(алкил)амино)бензимидазол-1-ил]иминометил}фенола (H3L1 и H3L2, алкил — этил или пропил). Методами элементного анализа и ИК спектроскопии установлено, что полученные комплексы имеют составы [Co(H2L1)(HL1)]·2C2H5OH и [Co(H2L2)(HL2)]CH3OH·1/2H2O. Их кристаллическое и молекулярное строение определено методом монокристальной рентгеновской дифракции. Из данных РСА установлено, что они кристаллизуются в три­клинной пространственной группе P–1 в виде сольватов с молекулами спиртов и воды. В моноядерных молекулах обоих комплексов к катиону Co(III) координированы два трисхелатных лиганда в моно- и дианионной формах. Координационное окружение атома кобальта CoN4O2 в обоих соединениях соответствует искаженному октаэдру.

Two Co(III) complexes are synthesized based on 2-{(E)-[2-(hydroxy(alkyl)amino)benzimidazole-1-yl]iminomethyl}phenol (H3L1 and H3L2, alkyl is ethyl or propyl). By the elemental analysis and IR spectroscopy it is established that the obtained complexes have the compositions [Co(H2L1)(HL1)]·2C2H5OH and [Co(H2L2)(HL2)]CH3OH·1/2H2O. Their crystal and molecular structures are determined by single crystal X-ray diffraction (XRD). From the XRD data it is found that the complexes crystallize in the triclinic space group $$P\bar{1}$$ as solvates with alcohol and water molecules. In mononuclear molecules of both complexes, two trischelate ligands in mono- and dianionic forms are coordinated to the Co(III) cation. The coordination environment of the cobalt atom CoN4O2 corresponds to a distorted octahedron in both compounds.

New Ni(II) and Pd(II) complexes ( Ia and Ib ) are synthesized on the basis of the azomethine compound 2-[( E )-[4-methyl-2-[( Z )- p -tolylazo]phenyl]iminomethyl]phenol. The structures and properties of the complexes are characterized by IR spectroscopy, 1 Н NMR spectroscopy, and X-ray diffraction analysis (СIF files CCDC nos. 1899223 ( Ia ) and 1899224 ( Ib )). The complex formation affords cyclometallated chelates. According to the X-ray diffraction data, the crystals of the Ni(II) and Pd(II) complexes are isostructural with the square geometry of the coordination mode (MCN 2 O, M = Ni, Pd) and formation of two five-membered and one six-membered metallocycles.

Complexes CuL 1 ⋅ MeOH ( Ia ), NiL 1 ⋅ MeOH ( Ib ), CоL 1 ⋅ MeOH ( Ic ), CuL 2 ( IIa ), NiL 2 ( IIb ), and CоL 2 ( IIc ) of the tetradentate azomethine compounds, namely, 4-methyl- N -[2-[( E )-2-[2-[2-[( E )-[2-( p -toluenesulfamino)phenyl]methyleneamino]ethoxy]ethyliminomethyl]phenyl]benzenesulfamide (H 2 L 1 ) and 4-methyl- N -[2-[( E )-3-[4-[3-[( E )-[2-( p -toluenesulfamino)phenyl]methyleneamino]propoxy]butoxy]-propyliminomethyl]phenyl]benzenesulfamide (H 2 L 2 ), which are the condensation products of 2-( N -tosylamino)benzaldehyde with 3,4-dioxa-1,8-octanediamine and 4,9-dioxa-1,12-dodecanediamine, are synthesized using the chemical and electrochemical methods. The structures, compositions, and properties of the synthesized metal complexes are studied by the methods of elemental analysis, IR spectroscopy, X-ray absorption spectroscopy, magnetochemistry, and X-ray diffraction analysis (СIF files CCDC nos. 1910746 ( Ia ), 1910747 ( Ib ), and 1910748 ( Ic )). In the molecules of compounds Ia – Ic , the L 1 macrocyclic ligand coordinates the metal atom by four nitrogen atoms via the tetradentate chelate mode to form the polyhedron as a distorted tetrahedron.

Novel Cu(II), Co(II), Ni(II), and Zn(II) complexes of 5-methyl-2-phenyl-4-[(4-phenylazo)anilinemethylylidene]- 2,4-dihydro-3H-pyrazole-3-thione and 5-methyl-4-[4-methyl-2-(4-methylphenylazo)anilinemethylylidene]- 2-phenyl-2,4-dihydro-3H-pyrazole-3-thione, i.e. ligands containing the phenylazo group in the ortho and para positions of the aniline fragment, were synthesized by the chemical and electrochemical methods. The complexes and ligands were characterized by IR, 1H NMR, X-ray absorption spectroscopy and magnetochemistry. The azo group of the ligands is not involved in coordination to the metal.

The Cu, Ni, and Со complexes based on the following new azomethine compounds containing azobenzene groups in the ortho- or para-positions of the amine fragment are synthesized: 2-allyl-6-[(E)-[4-(E)-phenylazophenyl]iminomethyl]phenol (HL1), 2-allyl-6-[(E)-[4-methyl-2-[(E)-phenylazo]-p-tolylazo] iminomethyl]phenol (HL2), 5-methoxy-2-[(E)-[4-[(E)-phenylazo]phenyl]iminoethyl]phenol (HL3), and 5-methoxy-2-[(E)-[4-methyl-2-[(E)-p-tolylazo]phenyl]iminomethyl]phenol (HL4). The structures of the complexes are determined by the data of IR and 1Н NMR spectroscopy (for the azomethine compounds), X-ray absorption spectroscopy, and magnetochemistry. The coordination centers of all Cu complexes have a distorted square structure. A direct dependence of the geometry of the coordination polyhedron on the position of azobenzene groups in the amine fragments of the ligands is found for the Ni and Co complexes. The octahedral environment of the nickel and cobalt ions takes place in the case of the ortho-position of the amine fragment, whereas the square environment for the Ni complexes or the tetrahedral environment for the Co complexes is observed at the para-position. The molecular structures of two azomethines HL1 and HL4 are determined by X-ray diffraction analysis (CIF files CCDC nos. 1552836 (HL1) and 1552837 (HL4)).

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

The controlled thermolysis of mono(Ni-II, Cu-II, and Co-II) and dinuclear (Ni-II, Cu-II, and Fe-II) chelate complexes with azomethine ligands, containing oxygen, nitrogen, and sulfur atoms in the chelate rings, was studied. The effect of the ligand environment on the thermal stability and composition of the resulting nanocomposites was examined. Comparative thermal analysis (DSC, DTA, and TGA) of the metal chelate complexes was performed. Their thermolysis products were characterized using elemental analysis, X-ray powder diffraction, scanning electron microscopy, and gel permeation chromatography. The magnetic properties of the nanocomposites obtained were analyzed.

A new 2-tosylaminobenzylidene-2′-amino-5′-chlorothiophenol ligand and its mono- and binuclear copper complexes are synthesized. Their structures are characterized by IR, 1 H NMR, and magnetochemistry. In the copper binuclear complex there is the antiferromagnetic exchange interaction between paramagnetic centers. The dimeric structure of the copper complex is confirmed by X-ray absorption spectroscopy. The addition of pyridine to the dimeric cooper complex results in the formation of a paramagnetic monomeric structure in which pyridine is coordinated to metal via the nitrogen atom.

New complexes of Cu(II), Co(II), Ni(II), and Zn(II) with 1-phenyl-3-methyl-4-(4-phenylazophenylaminomethylene)pyrazol-5-one (HL 1 ) and 1-phenyl-3-methyl-4-[4-methyl-2-(4-methylphenylazo)phenylaminomethylene]pyrazol-5-one (HL 2 ) are synthesized using chemical and electrochemical methods and characterized by IR spectroscopy, 1 H NMR spectroscopy, X-ray absorption spectroscopy, X-ray diffraction analysis, and magnetic measurements. All complexes are mononuclear. The structures of HL2 and related cobalt complex are determined by X-ray diffraction analysis (CIF files CCDC nos. 1028957 and 1035847, respectively).

Three novel palladium(II) azo complexes (I–III), whose compositions and structures were established from C, H, N, S elemental analysis and IR and 1H NMR spectroscopy, were synthesized by boiling palladium(II) acetate and some pyrazolazo derivatives, namely, 2-iso-propyl(phenyl)-3-methyl-4-[(4-meth-ylphenyl)diazenyl]-1H-pyrazol-5-one and 1-iso-propyl-3-methyl-4-[(4-methylphenyl)diazenyl]-1H-pyrazol-5-thione (HL(a–c)) in an acetone/methanol (1: 1) mixture. X-ray diffraction analysis was performed for complexes I and III. Complex I with an N2O2-ligand environment was established to have a trans-planar configuration for the PdN2O2 chelate ring, while the formation of the cis-planar structure by the PdN2S2 chelate ring was typical for complex III.