Ilya V. Taydakov

Improved Synthesis of 1H-Pyrazole-4-carbaldehyde

Abstract A simple and convenient two-step method for the synthesis of the title compound 1 was developed using N-protected 4-pyrazolilmagnesium bromide 9 as a key intermediate. Laborious procedures for purification or isolation of target compound are not required, therefore, up to 20 g of 1 could be obtained in a single run.

Synthesis, X-ray structure and luminescent properties of Sm3+ ternary complex with novel heterocyclic β-diketone and 1,10-phenanthroline (Phen)

Abstract A new neutral ternary samarium complex Sm(Phen)HL3 in which Phen is 1,10-phenanthroline and HL is (1,3-bis(1,3-dimethyl-1H-pyrazol-4-yl)-1,3-propanedione) was synthesized. Molecular structure of this complex was determined by X-ray diffraction. Under UV-light this complex is demonstrated bright red luminescence (λmax=647 nm), which was corresponding to the electric dipole 4G5/2→6H9/2 transition in Sm3+ ion. UV-absorption, excitation and emission spectra of the title compound were investigated.

Experimental determination of energy transfer in Eu(III) complexes, based on pyrazole substituted 1, 3-diketones

We succeeded in synthesis of the novel Eu-based luminophore with almost 100% efficiency of energy transfer from ligands to the lanthanide ion. The luminophores with β- diketonate ligands were characterized by means of optical spectroscopy. Impact of different types of β-diketonates on the quantum yield of luminescence was revealed. A β-diketonate complex exhibiting the highest luminescence quantum yield and prospective for OLED applications was determined. The reasons for decreasing quantum efficiencies for other types of investigated ligands are discussed.