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1Author    Ulrich Bayer, HansAlbert BruneRequires cookie*
 Title    Untersuchungen zur reduktiven Eliminierung des Biphenyl-Systems aus substituierten cis-Bis(phenyI)bis(triphenylphosphan)platin(II)-Verbindungen On the Reductive Elimination of the Biphenyl System from Substituted ci6-Bis(phenyl)bis(triphenylphosphane)platinum(II) Compounds  
 Abstract    The Compounds cw-[Pt(PPh3)2(4-X-C6H4)2] [X = F, Cl, CF3, OCH3, N(CH3)2] and cis-[Pt(PPh3)2(4-X-C6H4)(Y-C6H4)] [X = F/Y = 3 Cl, 4-C1, 3-CH30, 4-CH30; X = CF3/Y = 3-F, 4-F] have been synthesized and studied thermally with respect to the reductive elimination of disubstituted biphenyls. Activation parameters A H+ and A S+ are reported and discussed. 
  Reference    Z. Naturforsch. 38b, 226—236 (1983); eingegangen am 27. Oktober 1982 
  Published    1983 
  Keywords    Platinum-organic Compounds, Syntheses, Reductive Elimination, Activation Parameters 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0226.pdf 
 Identifier    ZNB-1983-38b-0226 
 Volume    38 
2Author    Ulrich Bayer, HansAlbert BruneRequires cookie*
 Title    Untersuchungen über Substituenten-Einflüsse auf die reduktive Eliminierung des Biphenyl-Systems aus as-Bis(aryl)bis(triphenylphosphan)platin(II)-Verbindungen Influence of Substituents on the Reductive Elimination of the Biphenyl-System from cis-Bis(aryl)bis(triphenylphosphane)platinum(II) Compounds  
 Abstract    Compounds cis-[Pt(PPh3)2(3-X-C6H4)2] [X = F, Cl, CF3, CH30, (CH3)2N] and cis-[Pt(PPh3)2(3-X-C6H4)(Y-C6H4)] [X = F/Y = H, 4-F, 4-CF3, 4-CH30; X = Cl/Y = 4-F; X = CF3/Y = 4-F; X = CH3Ö/Y = 4-F] have been synthesized and studied thermally with respect to the reductive elimination of disubstituted biphenyls. Activation parameters A H+ and A S4= are reported and discussed. 
  Reference    Z. Naturforsch. 38b, 621—631 (1983); eingegangen am 17. Januar 1983 
  Published    1983 
  Keywords    Platinum-organic Compounds, Syntheses, Reductive Elimination, Activation Parameters 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0621.pdf 
 Identifier    ZNB-1983-38b-0621 
 Volume    38 
3Author    T. Brückert, D. Büsing, A. Würflinger, S. UrbanRequires cookie*
 Title      
 Abstract    h e r m a l A n a ly s is (D T A) a n d D ie le c tr ic S tu d ie s o f 4 -(tra n s -4 -H e p ty l-C y c lo h e x y l) -b e n z o n itr ile (7 P C H) u n d e r H ig h P r e s s u r e With the aid of DTA the phase diagram of 4-(trans-4-heptyl-cyclohexyl)-benzonitrile, 7PCH, was redetermined. Dielectric studies on the static and complex permittivity have been performed on 7PCH in the pressure range 0.1 -220 MPa, the frequency range 1 kHz-13 MHz and the temperature range 290-380 K. For the slow relaxation process in the nematic phase, characterized by the relaxa­ tion time Tjj , we have calculated the activation volume, A* V u, of about 80 to 60 cm3/mol (decreasing with increasing temperature), and the activation enthalpy, A *Hn, of approximately 70 kJ/mol. The isochoric activation energy, A* Un, amounts to about 36 kJ/mol. The pressure dependence of A * Hu is less pronounced compared with previous findings for 5PCH and 7CB. Estimates of t 0 (extrapo­ lated from the relaxation time in the isotropic phase) allow the calculation of the retardation factor gu = Tn/t0 that is analysed in terms of theories of Martin-Meier-Saupe and Coffey in order to evalu­ ate the nematic potential q. Using data for the order parameter 5 from NMR studies it was possible to determine the strength of the interaction potential in the nematic phase and to check the relation q~S which is valid at p = const., but not at V= const. The results are compared with recent findings for other homologous series. 
  Reference    Z. Naturforsch. 50a, 977—983 (1995); received August 25 1995 
  Published    1995 
  Keywords    Dielectric Relaxation, High Pressure, Liquid Crystals, Activation Parameters, Phase Transitions 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0977.pdf 
 Identifier    ZNA-1995-50a-0977 
 Volume    50 
4Author    Waldemar Adam, Omar CuetoRequires cookie*
 Title    3,3-Dimethyl-4 [2-methyl-l-propenyl] -1,2-dioxetane: Its Thermal Stability and Chemiluminescent Properties  
 Abstract    The alkenyl-substituted 1,2-dioxetane (1) was prepared by photosensitized singlet oxygenation of 2,5-dimethyl-2,4-hexadiene and its activation and excitation parameters determined. It is shown that dioxetane (1) is comparable in its thermal stability to alkyl-substituted dioxetanes and an inefficient chemical source of electronic excitation. 
  Reference    Z. Naturforsch. 36b, 1653—1654 (1981); received June 29 1981 
  Published    1981 
  Keywords    1, 2-Dioxetanes, Chemüuminescence, Activation Parameters, Excitation Yields, Solvent Effects 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1653.pdf 
 Identifier    ZNB-1981-36b-1653 
 Volume    36 
5Author    Siegfried Lochschmidt, Alfred SchmidpeterRequires cookie*
 Title    Cyclische Triphosphenium-Ionen: Selektiver intramolekularer Ligandenaustausch in einer nucleophilen Substitution am zweifachkoordinierten Phosphor [1] Cyclic Triphosphenium Ions: Selective Intramolecular Exchange of Ligand in a Nucleophilic Substitution at the Two-Coordinate Phosphorus [1]  
  Reference    Z. Naturforsch. 40b, 765—773 (1985); eingegangen am 15. Januar 1985 
  Published    1985 
  Keywords    Ligand Exchange at Two-coordinate Phosphorus, Nucleophilic Substitution Mechanism, T-Shaped Transition Structure, Activation Parameters, Triphosphine-dionium Cations 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0765.pdf 
 Identifier    ZNB-1985-40b-0765 
 Volume    40