Igor B. Sivaev

Publications (45) View all

• Article: New boron-containing bacteriochlorin p cycloimide conjugate

  M. A. Grin, R. A. Titeev, O. M. Bakieva, D. I. Brittal, I. A. Lobanova, I. B. Sivaev, V. I. Bregadze, A. F. Mironov
  [show abstract] [hide abstract]
  ABSTRACT: A conjugate of the bacteriochlorophyll a derivative with the cobalt bis(dicarbollide) anion [3,3′-Co(1,2-C2B9H11)2]− was synthesized.
  Russian Chemical Bulletin 04/2012; 57(10):2230-2232. · 0.38 Impact Factor
• Article: Molecular Conductors with a 8-Hydroxy cobalt Bis(dicarbollide) Anion.

  Olga N Kazheva, Grigorii G Alexandrov, Andrey V Kravchenko, Irina D Kosenko, Irina A Lobanova, Igor B Sivaev, Oleg A Filippov, Elena S Shubina, Vladimir I Bregadze, Vladimir A Starodub, Lev V Titov, Lev I Buravov, Oleg A Dyachenko
  [show abstract] [hide abstract]
  ABSTRACT: Molecular conductors based on the 8-hydroxy cobalt bis(dicarbollide) anion, (TMTTF)[8-HO-3,3'-Co(1,2-C(2)B(9)H(10))(1',2'-C(2)B(9)H(11))] (1), (BMDT-TTF)[8-HO-3,3'-Co(1,2-C(2)B(9)H(10)) (1',2'-C(2)B(9)H(11))] (2), and (BEDT-TTF)[8-HO-3,3'-Co(1,2-C(2)B(9)H(10))(1',2'-C(2)B(9)H(11))] (3), were synthesized, and their crystal structures and electrical conductivities were determined. Compounds 2 and 3 are isostructural to the corresponding radical-cation salts of the parent cobalt bis(dicarbollide). All of the radical-cation salts prepared were found to be semiconductors. The relative stability of the rotation conformers of the [8-HO-3,3'-Co(1,2-C(2)B(9)H(10))(1',2'-C(2)B(9)H(11))](-) anion was estimated using DFT/BP86 quantum chemical calculations.
  Inorganic Chemistry 12/2010; · 4.60 Impact Factor
• Article: C−H Bond Activation of Arenes by [8,8′-μ-I-3,3′-Co(1,2-C2B9H10)2] in the Presence of Sterically Hindered Lewis Bases†

  Vladimir I. Bregadze, Irina D. Kosenko, Irina A. Lobanova, Zoya A. Starikova, Ivan A. Godovikov, Igor B. Sivaev
  [show abstract] [hide abstract]
  ABSTRACT: Reactions of the iodonium derivative of cobalt bis(dicarbollide) anion [μ-8,8′-I-3,3′-Co(1,2-C2B9H10)2] with Lewis bases in aromatic solvents were studied. The reactions proceed through the iodonium bridge opening, and the structure of the reaction products depends strongly on the nature of the Lewis base and solvent used. The reactions with conventional Lewis bases (L) give the corresponding products of Lewis base addition, [8-L-8′-I-3,3′-Co(1,2-C2B9H10)2], whereas the reactions with sterically hindered Lewis bases (L*) result in activation of the C−H bond of the aromatic solvent with formation of the corresponding aryl derivatives [8-Ar-8′-I-3,3′-Co(1,2-C2B9H10)2]−. Activated arenes, such as toluene, could react with [μ-8,8′-I-3,3′-Co(1,2-C2B9H10)2] without Lewis bases, whereas strongly deactivated arenes do not give C−H activation products even in the presence of sterically hindered Lewis bases.
  07/2010;
• Article: Synthesis of monosubstituted functional derivatives of carboranes from 1-mercapto-ortho-carborane: 1-HOOC(CH(2))(n)S-1,2-C(2)B(10)H(11) and [7-HOOC(CH(2))(n)S-7,8-C(2)B(9)H(11)](-) (n = 1-4).

  Marina Yu Stogniy, Igor B Sivaev, Pavel V Petrovskii, Vladimir I Bregadze
  [show abstract] [hide abstract]
  ABSTRACT: A general approach to synthesis of monosubstituted functional derivatives of 1,2-dicarba-closo-dodecaborane (ortho-carborane) is proposed. Reactions of the triethylammonium salt of 1-mercapto-ortho-carborane (Et(3)NH)[1-S-1,2-C(2)B(10)H(11)] with ethyl omega-bromoalkyl carboxylates and omega-bromoalkylnitriles in ethanol result in the corresponding carboranyl esters and nitriles that in turn can be converted to carborane-based carboxylic acids 1-HOOC(CH(2))(n)S-closo-1,2-C(2)B(10)H(11) (n = 1-4). Mild deboronation of the closo-carborane cage with CsF in ethanol gives caesium salts of the corresponding nido-carboranes Cs[7-HOOC(CH(2))(n)S-nido-7,8-C(2)B(9)H(11)]. This approach is suitable for synthesis of compounds to be used in boron neutron capture therapy and radionuclide diagnostics of cancer.
  Dalton Transactions 02/2010; 39(7):1817-22. · 3.84 Impact Factor
• Article: New approach to incorporation of boron in tumor-seeking molecules.

  I B Sivaev, A A Semioshkin, V I Bregadze
  [show abstract] [hide abstract]
  ABSTRACT: Cyclic oxonium derivatives of polyhedral boron hydrides have great potential for modification of various types of tumor seeking biomolecules and are very promising starting materials for synthesis of BNCT (boron neutron capture therapy) agents.
  Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine 04/2009; 67(7-8 Suppl):S91-3. · 1.09 Impact Factor