Willis Forsling

Publications (69) View all

• Article: Crystalline cadmium dialkyl phosphorodithioate complexes: Synthesis and structural organization as probed by multinuclear 13C, 31P, and 113Cd CP/MAS NMR and single-crystal X-ray diffraction

  A. V. Ivanov, O. V. Loseva, M. A. Ivanov, V. A. Konfederatov, A. V. Gerasimenko, O. N. Antzutkin, W. Forsling
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  ABSTRACT: The cadmium O,O′-dethyl (I) and O,O′-di-sec-butyl phosphorodithioate (II) complexes have been synthesized and characterized in detail by 13C, 31P, and 113Cd CP/MAS NMR. X-ray crystallography shows that complex II has a binuclear molecular structure [Cd2{S2P(O-s-C4H9)2}4]. For 31P and 113Cd NMR signals, the chemical shift anisotropy δaniso and the asymmetry parameter η have been calculated. The 31P NMR signals are assigned to the terminal and bridging ligands in the complexes.
  Russian Journal of Inorganic Chemistry 05/2012; 52(10):1595-1602. · 0.41 Impact Factor
• Article: Structural features and NMR 195Pt spectroscopy of cooperite monocrystals (natural Pts)

  A. V. Ivanov, V. I. Palazhchenko, V. E. Strikha, O. N. Antzutkin, W. Forsling
  Doklady Earth Sciences 04/2012; 410(1):1141-1144. · 0.38 Impact Factor
• Article: Structural organization of mercury(II) and copper(II) dithiocarbamates from EPR and 13C and 15N MAS NMR spectra and X-ray diffraction analysis

  A. V. Ivanov, E. V. Korneeva, B. V. Bukvetskii, A. S. Goryan, O. N. Antzutkin, W. Forsling
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  ABSTRACT: The structures and spectroscopic properties of mononuclear and binuclear mercury(II) and copper(II) complexes with four dithiocarbamate ligands R2NC(S)S− (R = CH3, C2H5, or iso-C3H7; R2 = (CH2)6) were studied by solid-state 13C and 15N CP/MAS NMR and EPR spectroscopy. Mercury(II) N,N-cyclohexamethylenedithiocarbamate [Hg2{S2CN(CH2)6}4] was obtained and characterized in detail by X-ray diffraction analysis at 299 K. The binuclear molecule of the complex is centrosymmetric; the central tricyclic fragment [Hg2S4C2] is in the chair conformation. In the 13C and 15N NMR spectra, the signals were assigned to the dithiocarbamate ligands with different structural functions: bidentate chelating and combined (both chelating and bridging) ones. The differences between the isotropic 15N chemical shifts for the dialkyldithiocarbamate ligands were interpreted in terms of combination of the mesomeric effect of the =NC(S)S-groups and the inductive effect of the alkyl substituents. According to the EPR data, copper(II) in magnetically diluted systems is mainly found in heterobinuclear molecules [CuHg(S2CNR2)4] and the geometry of the chromophores [CuS5] approximates to a tetragonal pyramid.
  Russian Journal of Coordination Chemistry 04/2012; 34(1):59-69. · 0.55 Impact Factor
• Article: Single-Crystalline cooperite (PtS): Crystal-Chemical characterization, ESR spectroscopy, and 195Pt NMR spectroscopy

  V. I. Rozhdestvina, A. V. Ivanov, M. A. Zaremba, O. N. Antsutkin, W. Forsling
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  ABSTRACT: Single-crystalline cooperite (PtS) with a nearly stoichiometric composition was characterized in detail by X-ray diffraction, electron-probe X-ray microanalysis, and high-resolution scanning electron microscopy. For the first time it was demonstrated that 195Pt static and MAS NMR spectroscopy can be used for studying natural platinum minerals. The 195Pt chemical-shift tensor of cooperite was found to be consistent with the axial symmetry and is characterized by the following principal values: δ xx = −5920 ppm, δ yy = −3734 ppm, δ zz = +4023 ppm, and δiso = −1850 ppm. According to the ESR data, the samples of cooperite contain copper(II), which is adsorbed on the surface during the layer-by-layer crystal growth and is not involved in the crystal lattice.
  Crystallography Reports 04/2008; 53(3):391-397. · 0.47 Impact Factor
• Article: Adducts of zinc and copper(II) dialkyldithiocarbamate complexes with dibutyl-and diisobutylamines: Synthesis, structures, EPR and solid-state natural abundance 13C and 15N CP/MAS NMR spectra

  A. V. Ivanov, A. S. Zaeva, E. V. Novikova, A. V. Gerasimenko, W. Forsling
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  ABSTRACT: Crystalline adducts of zinc and copper(II) dithiocarbamate complexes with dibutyl-and diisobutylamines of the general formula [M(NHR′2)(S2CNR2)2] (M = Zn, 63Cu, and 65Cu; R = CH3 and C2H5; R2 = (CH2)4O; R′ = C4H9 and i-C4H9) were synthesized. Their structures and spectroscopic properties were studied by EPR and solid-state natural abundance 13C and 15N CP/MAS NMR spectroscopy. Experimental EPR data and computer-assisted modeling confirmed the individual character of copper(II) adducts. The geometries of the copper coordination polyhedra were found to be intermediate between a tetragonal pyramid and a trigonal bipyramid (TBP). The contributions from TBP to the geometries of the adducts obtained were calculated from the EPR data. According to the X-ray diffraction data, the adduct of zinc diethyldithiocarbamate with diisobutylamine exists in two isomeric forms. The 13C and 15N CP/MAS NMR signals were assigned to the atomic positions in two crystallographically independent conformer molecules.
  Russian Journal of Coordination Chemistry 03/2007; 33(4):233-243. · 0.55 Impact Factor