Dmytro M. Khomenko

Structure and Fluorescence Properties of Uranyl Ion Complexes with 3-(2-Hydroxyphenyl)-5-(2-Pyridyl)-1,2,4-Triazole Derivatives

Structure of three new uranyl complexes with 3-(2-hydroxyphenyl)-5-(2-pyridyl)-1,2,4-triazoles was proposed basing on IR, UV spectroscopy, NMR and MALDI mass spectrometry data analysis. It was shown prospective using of triazoles as analytical reagents for fluorescence determination of uranyl ion.

Crystal structure of aqua­(nitrato-κO)dioxido{2-[3-(pyridin-2-yl-κN)-1H-1,2,4-triazol-5-yl-κN4]phenolato-κO}uranium(VI) aceto­nitrile monosolvate monohydrate

The UVI atom exhibits a pentagonal–bipyramidal N2O5 coordination environment. In the complex, the 1,2,4-triazole ligand is coordinated in a tridentate manner.

Bis(methanol-κO)dioxido[3,3'-(1H-1,2,4-triazole-3,5-diyl)diphenolato-κ3O,N4,O']uranium(VI) methanol monosolvate.

The structure of the title compound, [U(C(14)H(9)N(3)O(2))O(2)(CH(3)OH)(2)]·CH(3)OH, is the first to be reported for an actinide complex including triazole ligands. The U(VI) atom exhibits a pentagonal-bipyramidal NO(6) coordination environment, involving two axial oxide ligands [U=O = 1.766 (3) and 1.789 (3) Å], four equatorial O atoms [U-O = 2.269 (3)-2.448 (3) Å] from the ligand and the two coordinated methanol molecules, and one equatorial N atom [U-N = 2.513 (4) Å] from the ligand. In the crystal structure, the complex molecules are linked via intermolecular N-H...O and O-H...O hydrogen bonds to form a two-dimensional structure.

Synthesis, spectroscopic, structural characterization of Cd(II) and Zn(II) complexes based on the N-methyl-C-(2-pyridyl)nitrone

Abstract Zinc and cadmium complexes, ML2(NO3)2 (L = N-methyl-C-(2-pyridyl)nitrone) were synthesized and characterized by means of X-ray diffraction crystallography and IR and NMR spectroscopy. The organic ligands in the complexes are coordinated via the oxygen atom of the nitrone group and the nitrogen atom of the pyridine moiety. The coordination environment of the central atoms is a distorted octahedron. The bond lengths and angles of the complexes were calculated using the DFT method with B3LYP functional. Theoretical studies revealed that the geometric parameters are in agreement with the experimental data. The fluorescent properties for the zinc and cadmium complexes were investigated at room temperature.

Influence of the nature of the substituent in 3-(2-pyridyl)-1,2,4-triazole for complexation with Pd 2+

The structure of four new palladium complexes [Pd(HL2)Cl2 and Pd(L1–3)2] with 3-(2-pyridyl)-5-R-1,2,4-triazoles (R=H, CH3, Ph respectively HL1, HL2, HL3) was proposed based on IR, NMR, UV spectroscopy and MALDI mass spectrometry data analysis. It is found that the complexation of HL2 and HL3 with Pd2+ ions results in a decrease of their fluorescence intensity and it is vice versa in case of HL1. Furthermore, the influence of the substituent (R) in the 3-(2-pirydyl)-5-R-1,2,4-triazoles on the fluorescent and protolytic properties of HL1–3 was investigated.