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1999 (1)
1996 (1)
1Author    F. Ucun, F. KöksalRequires cookie*
 Title    An EPR Study on V0 2+ and Mn 2+ Ions in Some Zeolites  
 Abstract    The electron paramagnetic resonance (EPR) of hydrated V0S0 4 -3H 2 0 and MnCl 2 -2H 2 0, adsorbed on the synthetic zeolites 3A, 4A, 5A and 13X of pore diameters 0.3, 0.4, 0.5, and 1.0 nm, respectively, and the natural zeolites heulandite and clinoptilolite was investigated. The spectra indicated that the coordination structures are V0(H 2 0)5 + and Mn(H 2 0)g + , and that their EPR line widths vary with the pore diameters and the surface areas of the zeolites. The spectra of V0(H 2 0)5 + in natural zeolites at room temperature display an isotropic behavior and therefore indicate that the water ligands are mobile. The EPR spin Hamiltonian parameters, the molecule orbital constant ß* 2 , and the Fermi contact term K e[[ were determined and are discussed. The spectra of Mn(H 2 0)^ for narrow-pore zeolites indicate the existence of mobile and immobile water, whereas for wide-pore and natural zeolites they indicated the existence of only mobile water. The obtained Mn(H 2 Ö)g + spectra are discussed. 
  Reference    Z. Naturforsch. 51a, 23—26 (1996); received October 17 1995 
  Published    1996 
  Keywords    EPR, V0 2 +, Mn 2 +, Zeolites, Coordination 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0023.pdf 
 Identifier    ZNA-1996-51a-0023 
 Volume    51 
2Author    B. Karabulut, R. TapramazRequires cookie*
 Title    EPR Spectra of V0 2+ Doped Ammonium Oxalate Monohydrate Single Crystals  
 Abstract    The EPR spectra of V0 2+ ions in ammonium oxalate monohydrate, [(NH 4)2C 2 04-H20], single crystals have been studied at room temperature and at 113 K in mutually three perpendicular planes. The spin Hamiltonian parameters are determined using a numerical technique together with a trial and error procedure to resolve the single crystal spectra. The parallel and perpendicular components of axially symmetric g and hyperfine tensors for V0 2+ ion in ammonium oxalate monohydrate single crystal are determined, and the results are discussed. 
  Reference    Z. Naturforsch. 54a, 370—374 (1999); received April 13 1999 
  Published    1999 
  Keywords    EPR, (NH^CjO,, H 2 0, V0 2+, Ammonium Oxalate Monohydrate 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0370.pdf 
 Identifier    ZNA-1999-54a-0370 
 Volume    54