Andrei Drozdov

Andrei Drozdov

Lomonosov Moscow State University
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Andrei Drozdov has a total of 22 co-authors. Here are the top co-authors by number of shared publications:

Latest Publications

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    Self-Assembly of a Two-Dimensional Coordination Polymer Based on Silver and Lanthanide Tetrakis-Acylpyrazolonates: An Efficient New Strategy for Suppressing Ligand-to-Metal Charge Transfer Quenching of Europium Luminescence

    by Yury A. Belousov, Mikhail T. Metlin, Darya A. Metlina, Mikhail A. Kiskin, Ilya A. Yakushev, Trofim A. Polikovskiy, Ilya V. Taydakov, Andrei A. Drozdov, Fabio Marchetti, Claudio Pettinari

    A new strategy for the easy polymerization of anionic [Ln(Qcy)4]− (HQcy-4-(cyclohexanecarbonyl)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one) into two-dimensional layers of [AgLn(Qcy)4]n (Ln = Sm, Eu, Gd, Tb and Dy) is proposed by binding the single molecular anions [Ln(Qcy)4]− to silver cations through the coordination of the pyridinic nitrogen atoms of the pyrazolonate rings. The luminescent properties of [AgLn(Qcy)4]n have been studied in detail, and it was shown that the previously described low photoluminescence quantum yield (PLQY) of [Eu(Qcy)4]− is due to Ligand-To-Metal Charge Transfer (LMCT) quenching, which is effectively suppressed in the heterometallic [AgEu(Qcy)4]n polymer. Sensibilization coefficients for H3O[Eu(Qcy)4], [AgEu(Qcy)4]n, and H3O[Sm(Qcy)4] complexes (n ≈ 1) were estimated via theoretical analysis (also by using Judd-Ofelt theory for Sm3+) and PLQY measurements.

    Cited by 19
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    Synthesis of novel lanthanide acylpyrazolonato ligands with long aliphatic chains and immobilization of the Tb complex on the surface of silica pre-modified via hydrophobic interactions

    by C. Pettinari, F. Marchetti, R. Pettinari, Y. A. Belousov, I. V. Taydakov, V. D. Krasnobrov, D. I. Petukhov, A. A. Drozdov

    Five new complexes Ln(QC17)3(H2O)(Solv) (Ln = Y, Solv = H2O, Ln = Tb, Dy, Sm or Eu, Solv = EtOH) were synthesized with the acylpyrazolonato ligand QC17 bearing a long aliphatic C17H35 chain in the acyl moiety, and the crystal structure of Y(QC17)3(H2O)2 shows the three aliphatic chains from the coordinated ligands positioned in the same direction, affording plane layers built by Y(QC17)3(H2O)2 molecules connected through H-bonding interactions. The layers are stitched to each other like in “hook & loop” tapes. Luminescence of complexes was determined and the complex Tb(QC17)3(H2O)(EtOH) was immobilized on the surface of silica preprocessed using a C17H35CONH(CH2)3Si(OEt)3 reagent via hydrophobic interactions of long aliphatic chains. Luminescent properties and micromorphology of the obtained hybrid particles and hybrid films were investigated. Intensive green emission of the complex retains after grafting onto the silica surface. Inclusion of the complex on the surface of silica materials occurs as separate molecules, after the disruption of the H-bonding network present in the crystalline phase of the pure terbium sample.

    Cited by 20
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    Reactivity of rhodium-β-diketonato cyclooctadiene derivatives with mono- and di-phosphines. Synthesis, structural and spectroscopic characterization of Rh(I) and Rh(III) species containing unsymmetrical β-diketonate and P-donor ligands

    by Claudio Pettinari, Fabio Marchetti, Riccardo Pettinari, Adriano Pizzabiocca, Andrei Drozdov, Sergey I. Troyanov, Vyatcheslav Vertlib

    Cited by 16
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    A new family of ionic dinuclear strontium (imH2)2[Sr2(Q)6] compounds (imH = imidazole; QH = 1-phenyl-3-methyl-4-acylpyrazol-5-one)

    by Fabio Marchetti, Claudio Pettinari, Riccardo Pettinari, Augusto Cingolani, Andrei Drozdov, Sergei Troyanov

    New neutral [Sr(Q)2(L)n]m or ionic (imH2)2[Sr2(Q)6] air stable complexes (QH = 1-phenyl-3-methyl-4-R(CO)-pyrazol-5-one; in detail Q = QT for R = CH2CMe3, Q = QP for R = Ph and Q = QF for R = CF3; n = m = 1 for L = tetraglyme (2,5,8,11,14-pentaoxapentadecane); n = m = 2 for L = H2O; n = 2 and m = 1 for moeH (2-methoxyethanol), dmaeH (N,N-dimethylaminoethanol) or phen (1,10-phenanthroline); imH = imidazole) have been synthesized and fully characterized. The X-ray crystal structures of [Sr(QT)2(moeH)2]2 and of (imH2)2[Sr2(QT)6] have been determined. The compound [Sr(QT)2(moeH)2]2 contains an eight-co-ordinate Sr atom in a square antiprismatic environment, due two bidentate chelating Q donors and two bidentate 2-methoxyethanol ligands. The compound (imH2)2[Sr2(QT)6] is composed of two imidazolium cations and a dianionic fragment [Sr2(QT)6]2−, which is a centrosymmetric dimer containing four terminal and two bridging Q donor ligands.

    Cited by 12
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    Synthesis, structure and luminescence properties of new rare earth metal complexes with 1-phenyl-3-methyl-4-acylpyrazol-5-ones

    by Claudio Pettinari, Fabio Marchetti, Riccardo Pettinari, Andrei Drozdov, Sergei Troyanov, Alexander I. Voloshin, Nail M. Shavaleev

    The isolation and characterization of new lanthanide complexes of formula [Ln(QL)3(EtOH)(H2O)], (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb; HQL = 1-phenyl-3-methyl-4-phenylacetylpyrazol-5-one) [Ln(QL)3(H2O)2] (L = La or Lu), [Ln(QS)3(EtOH)(H2O)] (Ln = Tb or Eu; HQS = 1-phenyl-3-methyl-4-thienoylpyrazol-5-one, [Tb(QO)3(EtOH)(H2O)] (HQO = 1-phenyl-3-methyl-4-furanoylpyrazol-5-one) [Tb(QF)3(H2O)2] (HQF = 1-phenyl-3-methyl-4-trifluoroacetylpyrazol-5-one) and [NBu4][Ln(Q)4] (Ln = Eu or Tb, Q = QF or QL) is reported. The crystal structure of the tris(β-diketonate) complexes [Nd(QL)3(EtOH)(H2O)], [Dy(QL)3(EtOH)(H2O)](EtOH), and [Eu(QS)3(H2O)(EtOH)] containing eight-coordinate lanthanide ions in a square antiprismatic environment has been determined. The coordination environment in the tetrakis complex [NBu4][Eu(QF)4] is also close to the square antiprismatic one. Photoluminescence (PL) and phosphorescence studies of selected derivatives are reported.

    Cited by 66
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    The interaction of organotin(iv) acceptors with 1,4-bis(5-hydroxy-1-phenyl-3-methyl-1H-pyrazol-4-yl)butane-1,4-dioneCoordination chemistry of bis(pyrazolones): a rational design of nuclearity tailored polynuclear complexes. Part 2.22

    by Claudio Pettinari, Fabio Marchetti, Riccardo Pettinari, Augusto Cingolani, Andrei Drozdov, Sergei Troyanov

    From the interaction of organotin(IV) halides SnR2Cl2 with 1,4-bis(5-hydroxy-1-phenyl-3-methyl-1H-pyrazol-4-yl)butane-1,4-dione (Q2QH2) in methanol in the presence of base the complexes [SnR2(Q2Q)] (1: R = isobutyl (Bui); 2: R = n-octyl (Ot); 3: R = n-dodecyl (Do)) have been synthesised. The reaction between equimolar quantities of R2SnO and Q2QH2 in toluene yields the dinuclear derivatives [SnR2(Q2Q)]24 (R = Me) and 5 (R = Bun) which have a cis-R2Sn configuration in solution whereas from the reaction of Q2QH2 with SnMe2Cl2 in CH3OH in the presence of KOH, an insoluble probably polynuclear isomeric form of 4 formed. The reaction between Q2QH2 and (R3Sn)2O produces the derivative [(SnR3)2(Q2Q)] (6: R = Bun; 7: R = Ph). 6 reacts with water yielding the aquo complex [(SnBun 3)2(Q2Q)(H2O)] 8. The X-ray crystal structures of [SnBun 2(Q2Q)]25, [(SnBun 3)2(Q2Q)] 6 and [(SnPh3)2(Q2Q)] 7 have been determined. Compound 5 is a binuclear species with the tin atoms in a distorted octahedral Sn-cis-C2O4 environment (skewed trapezoidal bipyramidal) with the C–Sn–C angles ranging from 107.28(14) to 112.4(2)°. The two different carbonyl groups coordinate the metal with different donor abilities (the Sn–O bond lengths range from 2.132(2) to 2.209(2) Å). Compounds 6 and 7 contain a dianionic ligand (Q2Q)2− bridged to two triorganotin(IV) fragments with the tin atoms in a strongly distorted trigonal bipyramidal environment. 1H, 13C and 119Sn NMR (rt and −55 °C) data indicate that the diorganotin(IV) derivatives 1–5 are not fluxional in solution whereas 6–8 slowly undergo disproportionation reaction, affording SnR4 and [SnR2(Q2Q)]2.

    Cited by 18
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    The interaction of organotin(IV) acceptors with a benzoic acid containing two pyrazolone groups †

    by Claudio Pettinari, Fabio Marchetti, Riccardo Pettinari, Domenico Martini, Andrei Drozdov, Sergei Troyanov

    A new polydentate ligand, namely 2-[(5-hydroxy-1-phenyl-3-methylpyrazol-4-yl)(5-oxo-1,5-dihydro-4-phenyl-2-methylpyrazol-4-ylidene)methyl]benzoic acid (H2QBz), has been prepared and characterized. The structure of the ligand H2QBz consists of discrete molecules linked to one another by an extensive H-bonding network. The reactivity of H2QBz towards [R3Sn]2O (R = Ph or Bun) and RnSnCl4 − n (R = Me, Bun, But, Ph, n = 2; R = Me, n = 3) has been investigated. Mono- and di-nuclear derivatives have been obtained depending on the nature of the starting acceptor and reaction conditions. [Ph3Sn(HQBz)] 1 contains the HQBz ligand coordinated to Ph3Sn through the deprotonated carboxylic group. In the complex [(H2O)Ph3Sn(HQBz)] 2, obtained by hydration of 1, the coordination sphere of tin is completed by bonding to a water molecule. The compounds [(R3Sn)2(QBz)] (R = Me, 3; Bun, 4) contain the dianionic ligand bridged to two triorganotin(IV) fragments. In solution the mononuclear triorganotin(IV) aqua complexes [(H2O)R3Sn(HQBz)] (R = Ph, 2; Bun, 5) loose the molecule of water and slowly decompose, yielding the free ligand and the R3SnOH species. The diorganotin(IV) derivatives [R2Sn(QBz)]2 (R = Me, 6; But, 7; Bun, 8; Ph, 9) are dinuclear both in the solid state and in solution. In the structure of [Me2Sn(QBz)]26 both acidic H atoms of the ligand are substituted by tin: a dimeric centrosymmetric structure forms, involving two [QBz]2− ligands acting as bridges between two tin atoms through both pyrazolone and benzoate moieties. Sn centers in the dimer are five-coordinated in a strongly distorted trigonal bypiramidal environment.

    Cited by 38
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    Novel bis(acylpyrazolonato)cadmium(II) derivatives and their reactivity toward aromatic and aliphatic N2-donor ligands

    by Claudio Pettinari, Fabio Marchetti, Augusto Cingolani, Riccardo Pettinari, Sergei I. Troyanov, Andrei Drozdov

    By reaction of 1-phenyl-3-methyl-4-R-C(O)-pyrazol-5-one (HQT: R = CH2C(CH3)3; HQC: R = C6H11) with Cd(O2CCH3)2·2H2O in EtOH the derivatives [Cd(QT)2(EtOH)2] 1 and [Cd(QC)2(EtOH)2] 2 have been synthesised. Complex 1 has a molecular structure with a slightly distorted octahedral coordination of the cadmium atom with EtOH and QT ligands trans to each other. When the reaction between HQT or HQC and Cd(O2CCH3)2·2H2O was carried out in the presence of bidentate N-donor ligands L (L = 1,10-phenanthroline, 2,2′-bipyridyl, N,N′,N′-trimethylethylenediamine or tetramethylethylenediamine), [Cd(QT)2(L)] and [Cd(QC)2(L)] were always obtained. In the six-coordinate derivatives [Cd(QC)2(1,10-phenanthroline)] and [Cd(QT)2(tetramethylethylenediamine)] the cadmium atom is in a strongly distorted octahedral environment due to steric requirements of the bidentate N2-donor ligands. All complexes synthesized have been characterized spectroscopically by IR, 1H and 113Cd NMR. The behavior in solution is also discussed.

    Cited by 19