A number of chlorine-substituted azomethines of 2-hydroxybenzaldehydes and their zinc(II) complexes were synthesized. Structure of azomethines and zinc complexes was established by elemental ...analysis, IR,
1
H NMR, and X-ray spectroscopy data. Complexes ZnL
2
have a tetrahedral structure. The complexes exhibit weak photoluminescent properties in methylene chloride, whereas the photoluminescence quantum yields of the solid complexes are 100 times higher. Biological activity of the azomethines and zinc complexes was studied.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The reduction of 7-nitro-N(9)-substituted 2,3-dihydroimidazo1,2-
a
benzimidazoles with SnCl
2
in conc. HCl forms a mixture of the previously unknown 7-amino and 7-amino-6-chloro derivatives in a ...ratio depending on the nature of the substituent at position 9. This result gave grounds to assume that not the final heteroarylamine, but the intermediate heteroarylhydroxylamine formed by a mechanism similar to the acid-induced Bamberger rearrangement of arylhydroxylamines, is subjected to chlorination.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
(4
Z
)-4-(2-Diethylaminoethylamino)methylene-5-methyl-2-phenylpyrazol-3-one (НL, product of the condensation of 5-hydroxy-3-methyl-1-phenylpyrazole-4-carbaldehyde with
N
,
N
-diethylethylenediamine) ...and its complexes CuL
2
(
I
) and Co(L)CH
3
COO · CH
3
OH · H
2
O (
II
) are synthesized. The structures and compositions of the synthesized compounds are determined by elemental analysis,
1
Н NMR and IR spectroscopy, and X-ray diffraction analysis (CIF files CCDC nos. 1971770 (
I
) and 1971772 (
II
)). Bis(chelate) pentacoordinated complex
I
has a distorted tetragonal pyramidal structure, and a distorted octahedral structure with the monodentate acetate anion and methanol and water molecules is observed for monochelate complex
II
.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
A new anionic Co(III) complex with 2-((E)-(2-(ethylamino)-5-nitrophenylimino)methyl)-4-(phenyl diazenyl)-phenol is prepared and characterized by
1
H NMR, IR spectroscopy, and elemental analysis. The ...crystal structure of the complex is studied by single crystal X-ray diffraction (XRD). From the single crystal XRD data it is found that in the complex, two structurally non-equivalent molecules of the doubly deprotonated ligand are tridentate-chelated by the central Co atom. The cobalt(III) ion is in a slightly distorted octahedral environment of four N and two O atoms.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
A new series of Zn(II) complexes were prepared with Schiff bases ligand derived by condensation of 2-tosylamonobenzaldehide with various aminoalcohols.
The local atomic structure around Zn atoms in ...complexes was determined by EXAFS.
The electronic absorption spectra, photoluminescence, and biological activities of the complexes were investigated.
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The synthesis of a series of zinc(II) complexes with Schiff bases products of condensation of 2-tosylamonobenzaldehide with various aminoalcohols containing aliphatic spacers of a variable length (CH2)n (n = 2–6) was performed. All compounds were characterized with C, H, N elemental analysis, FT-IR, 1H NMR, X-ray absorption spectroscopy, UV–Vis and photoluminescence data. The local atomic structures of complexes were determined by X-ray absorption spectroscopy from analysis of EXAFS and XANES of Zn K-edges. The electronic absorption spectra, photoluminescence, and biological activities of the complexes were investigated. The assignments of the experimental UV–Vis spectra of zinc(II) complexes have been carried out by Time-Dependent Density Functional Theory TD-DFT calculations.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
New Cu(II) and Co(II) complexes with the N-{2-(E)-(4-cyclohexylphenyl)iminomethylphenyl}-4-methylbenzene-1-sulfonamide Schiff base are prepared and characterized by
1
H NMR, IR spectroscopy, and ...elemental analysis. The crystal structure of azomethine and its complexes is studied by XRD. The obtained XRD data show that two N,N-bidentate ligands are chelated to Cu(II) and Co(II) ions in both complexes and form a distorted tetrahedral environment of four nitrogen atoms around the ions.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SIK, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Two Co(III) complexes are synthesized based on 2-{(E)-2-(hydroxy(alkyl)amino)benzimidazole-1-yliminomethyl}phenol (H
3
L
1
and H
3
L
2
, alkyl is ethyl or propyl). By the elemental analysis and IR ...spectroscopy it is established that the obtained complexes have the compositions Co(H
2
L
1
)(HL
1
)·2C
2
H
5
OH and Co(H
2
L
2
)(HL
2
)CH
3
OH·1/2H
2
O. 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
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 CoN
4
O
2
corresponds to a distorted octahedron in both compounds.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The data based on the X-ray diffraction analysis results obtained within the recent 20 years about the coordination modes of aroyl(acyl)hydrazones of aldehydes and ketones containing chelatophoric ...groups of atoms and their photoluminescence and magnetic properties and biological activity are reviewed and generalized. The most significant earlier studies of the metal complexes with the aroyl(acyl)hydrazone ligands are also considered. This review is fruitful for researchers specialized in the target synthesis of new metal complexes of the ligands of this class aimed at manufacturing practically important materials based on these complexes.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Azomethines were synthesized from 2,4,6-trimethylaniline, salicylaldehyde, and its 3(5)-halogen derivatives, as well as their complexes with zinc(II) (ZnL
2
). The structure and composition of the ...compounds were determined by elemental analysis, IR,
1
H NMR, and X-ray spectroscopy. The ZnL
2
complexes have a tetrahedral structure. The photoluminescent properties of azomethines and their zinc complexes in methylene chloride solutions and in solid state have been studied. The photoluminescence quantum yields of azomethines lie in the range 4.66–12.16%; for zinc complexes they decrease to 0.45–2.02%. The average photoluminescence lifetimes for azomethines and their complexes range from 2.00 to 2.87 ns. Azomethine, obtained from 2,4,6-trimethylaniline and dichlorosalicylic aldehyde, and its complex with zinc have significant protistocidal activity.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
This review article explores and analyzes published data on the photoluminescence and electroluminescence characteristics of rare earth element (REE) complex compounds, which are promising materials ...for creating highly efficient OLED devices. Distinguishing features of such compounds include their narrow emission bands, Stokes shift, long lifetime, and high quantum yields, enabling high resolution and color purity in constructed OLED devices. Using REE complexes as emissive layers in light-emitting diodes ensures significant color saturation and high device efficiency.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
