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2000 (2)
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1Author    G. N. Chekhova, S. D. Goren, JuH. Krieger, D. Linsky, V. Lusternik, A. M. Panich, A. R. Semenov, A. VoronelRequires cookie*
 Title    Specific Heat and Nuclear Quadrupole Resonance Study of Thiourea-Hexachloroethane Inclusion Compound  
 Abstract    Specific heat and 35 C1 nuclear quadrupole resonance (NQR) measurements of the channel thio-urea-hexachloroethane inclusion compound are presented. Experimental NQR data confirm the results of atom-atom potential calculations that the guest sublattice comprises two types of nearly commensurate finite molecular chains, having different structure and separated by domain walls. Specific heat measurements show phase transition near 96 K. 
  Reference    Z. Naturforsch. 55a, 335—338 (2000); received August 23 1999 
  Published    2000 
  Keywords    NQR, Specific Heat, Inclusion Compound, Thiourea, Hexachloroethane 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0335.pdf 
 Identifier    ZNA-2000-55a-0335 
 Volume    55 
2Author    Cyril Párk, M. Ohammed, A. Al-SalamahRequires cookie*
 Title    Thermal Decomposition of Aromatic Thioureas [1]  
 Abstract    T herm al decomposition of aromatic and heteroarom atic thioureas in boiling chlorobenzene is a first-order reaction. The reaction involves intram olecular hydrogen transfer followed by a cleav­ age of the C -N bond which is the rate-limiting step. The rate constants of decom position have been determ ined and correlated with quantum -chem ical reactivity indices. 
  Reference    (Z. Naturforsch. 41b, 101 [1986]; received August 14 1985) 
  Published    1986 
  Keywords    Thioureas, Isothiocyanates, Thermal D ecom position, Side-Chain Elim ination, Kinetics 
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 TEI-XML for    default:Reihe_B/41/ZNB-1986-41b-0101.pdf 
 Identifier    ZNB-1986-41b-0101 
 Volume    41 
3Author    Oliver Seidelmann, Lothar Beyer, Rainer RichterRequires cookie*
 Title    N,N-Disubstituierte N'-Ferrocenoylthioharnstoffe als zweizähnige Komplexliganden für Übergangsmetallionen. Kristallstruktur von Bis-(N,N-diethyl-N'-ferrocenoylthioureato)nickel(II) N,N-Disubstituted N'-Ferrocenoyl Thioureas as Bidentate Ligands for Transition Metal Ions. Crystal Structure of Bis-(N,N-diethyl-N'-ferrocenoylthioureato)nickel(II)  
 Abstract    N,N-diethyl-N'-ferrocenoyl-thiourea and N-(morpholino-thiocarbonyl)ferrocenecarboxylic amide have been prepared by the reaction of ferrocenoyl chloride with potassium thiocyanate and the respective amine in dry acetone. These bidentate ligands yield neutral heterometal-lic complexes with Ni(II), Cu(II), Mn(II) and Co(III). The dark brown air stable crystals of bis-(N,N-diethyl-N'-ferrocenoylthioureato)nickel(II) were characterized by X-ray structure de­ termination. Lattice dimensions: a = 1870.9(1), b = 1161.5(1), c = 1491.4(1) pm; space group Pca2!, Z = 4, R = 0.030 for 5707 observed reflections. 
  Reference    Z. Naturforsch. 50b, 1679—1684 (1995); eingegangen am 23. März 1995 
  Published    1995 
  Keywords    Ferrocene Complexes, Thiourea, Hetero Metal Complexes, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1679.pdf 
 Identifier    ZNB-1995-50b-1679 
 Volume    50 
4Author    Frank Leßmann3, Lothar Beyer3, Rainer Richter3, Reinhard MeusingerbRequires cookie*
 Title    N-Benzoylthiocarbamoyl Amino Acid Ethyl Esters as Chelate Ligands for Transition Metal Ions  
 Abstract    The reactions of benzoyl isothiocyanate with amino acid ethyl esters (N-butyl glycine ethyl ester, (S)-(-)-proline ethyl ester) give N-benzoylthiocarbamoyl amino acid ethyl esters. Apart from the expected N-benzoylthiocarbamoyl (S)-(-)-proline ethyl ester the racemic N-benzoyl­ thiocarbamoyl (/?)/(S)-proline ethyl ester is formed because of base catalyzed racemization of the educt (5')-(-)-proline ethyl ester during the reaction of (S)-(-)-proline ethyl ester hy­ drochloride with triethylamine. The structures of both compounds were established by X-ray crystal structure analysis and specific optical rotation measurements. The ligands yield neutral 2:1 chelates with Ni , Cu11, Pd11 and Pt11. The carboxylic oxygen atoms are not involved in the chelation. The ligands and the resultant complexes show configurational E/Z isomerism. In the case of the chelates of the racemic N-benzoylthiocarbamoyl (/?)/(5)-proline ethyl ester, additional R/S isomerism is observed as shown by 
  Reference    Z. Naturforsch. 53b, 981—990 (1998); received November 11 1997 
  Published    1998 
  Keywords    Thioureas, Amino Acid Ethyl Esters, Chelates, NMR Data, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0981.pdf 
 Identifier    ZNB-1998-53b-0981 
 Volume    53 
5Author    L. Guibé, A. Péneau, M. Gourdji, A. PanichRequires cookie*
 Title    Thiourea and Thiourea Inclusion Compounds. A 14 N NQR Investigation  
 Abstract    A reinvestigation of the nitrogen-14 NQR in thiourea has permitted to record, apparently for the first time, the resonances above 169 K. The first order and second order of the transitions at 169 K and 202 K, respectively, appear clearly from the temperature dependence of the resonance frequencies; the mod-ulated structure, incommensurate or commensurate, is also seen on the 14 N NQR spectrum. This study is the first step of a new investigation of thiourea and its inclusion compounds. 
  Reference    Z. Naturforsch. 55a, 331—334 (2000); received October 13 1999 
  Published    2000 
  Keywords    Thiourea, Nitrogen-14 NQR, Phase Transitions, Commensurate, Incommensurate Modu-lations, Inclusion Compounds 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0331.pdf 
 Identifier    ZNA-2000-55a-0331 
 Volume    55