Browsing by Subject "Substitution reactions"

Now showing items 1-11 of 11

    • Article  

      Catalytic behavior of La-Sr-Ce-Fe-O mixed oxidic/perovskitic systems for the NO+CO and NO+CH4+O2 (lean-NOx) reactions 

      Belessi, Vassiliki C.; Costa, Costas N.; Bakas, Thomas V.; Anastasiadou, T.; Pomonis, Phillippos J.; Efstathiou, Angelos M. (2000)
      Mixed oxides of the general formula La0.5SrxCeyFeOz were prepared by using the nitrate method and characterized by XRD and Mossbauer techniques. The crystal phases detected were perovskites LaFeO3 and SrFeO3-x and oxides ...
    • Article  

      Chemistry of 4-dicyanomethylene-1,2,6-thiadiazines 

      Koutentis, Panayiotis Andreas; Rees, C. W. (2000)
      The chlorine atoms in 3,5-dichloro-4-dicyanomethylene-1,2,6-thiadiazine 1 are readily displaced by thiophenols in the presence of Hünig's base, the first at -78 °C and the second at 20 °C to give the orange mono- and ...
    • Article  

      Cyclisation chemistry of 4H-1,2,6-thiadiazines 

      Koutentis, Panayiotis Andreas; Rees, C. W. (2000)
      3,5-Dichloro-4H-1,2,6-thiadiazin-4-one 1 condenses rapidly at room temperature with 1,2-diaminobenzene, 2-aminothiophenol and sodium 2-aminophenoxide to give, respectively, the purple thiadiazinoquinoxaline 4a, red ...
    • Article  

      Effect of halogen substitution on o-Phenylenebiscarbene 

      Nicolaïdes, Andrew N. (2005)
      The effect of halogen (F, Cl and Br) perturbation on the geometries and relative energies of five electronic states (one quintet, two triplets and two singlets) of o-phenylenebiscarbene (1-H) is examined computationally ...
    • Article  

      Effect of halogen substitution on p-phenylenebiscarbene 

      Nicolaïdes, Andrew N. (2005)
      The effect of halogen (F, Cl, and Br) perturbation on the geometries and relative energies of five electronic states (one quintet, two triplets, and two singlets) of p-phenylenebiscarbene (1-H) was examined computationally ...
    • Article  

      Fabrication, characterization and applications of novel nanoheater structures 

      Gu, Z.; Cui, Q.; Chen, J.; Buckley, J.; Ando, T.; Erdeniz, D.; Wong, P.; Hadjiafxenti, A.; Epaminonda, P.; Gunduz, I. E.; Rebholz, Claus; Doumanidis, C. C. (2013)
      Nanoheaters are reactive nanostructures that can generate localized heat through controlled ignition. Besides the widely used nanofoil structure with multiple alternative Al-Ni layers, various new nanostructures have been ...
    • Article  

      Lattice thermal conductivity of K 2(Bi 1-zSb z) 8Se 13 solid solutions 

      Kyratsi, Theodora; Hatzikraniotis, E.; Paraskevopoulous, M.; Dyck, J. S.; Shin, H. K.; Uher, C.; Kanatzidis, M. G. (2004)
      The influence of the Bi/Sb partial substitution to the lattice thermal conductivity of the K 2(Bi 1-zSb z) 8Se 13 solid solution series was studied. The variation of the lattice thermal conductivity with comparison was ...
    • Article  

      Normal and defective perylene substitution sites in alkane crystals 

      Leontidis, Epameinondas; Heinz, H.; Palewska, K.; Wallenborn, E. -U; Suter, U. W. (2001)
      The substitution nature of perylene in polycrystalline solid alkane matrices was examined. Low temperature excitation-emission matrix spectroscopy was used to determine substitution sites in alkane matrices from hexane to ...
    • Article  

      o-Phenylene halocarbenonitrenes and o-phenylene chlorocarbenocarbene: A combined experimental and computational approach 

      Enyo, T.; Arai, N.; Nakane, N.; Nicolaïdes, Andrew N.; Tomioka, H. (2005)
      Computations find that o-phenylene(halo)carbenonitrenes 2-XN, X = F, Cl, Br, have quinoidal singlet biradical ground states such as the parent o-phenylenecarbenonitrene (2-HN). Compared to the parent 2-HN, halogen substitution ...
    • Article  

      Photochemistry of an azido-functionalized cryptand: Controlling the reactivity of an extremely long-lived singlet aryl nitrene by complexation to alkali cations 

      Bucher, G.; Tönshoff, C.; Nicolaïdes, Andrew N. (2005)
      Photolysis of the cryptand 1, bearing an intraannular azido substituent, results in a complex photochemistry. Low-temperature photolysis yields the triplet nitrene 32, which has been characterized by EPR spectroscopy. Small ...
    • Article  

      Reaction of tetracyanoethylene with SCl1 

      Koutentis, Panayiotis Andreas; Rces, C. W. (2000)
      The chloride ion catalysed addition of SCl2 to TCNE gives the 4-dicyanomethylene-l,2,6-thiadiazine 2 (60%) with two minor products (5%) of extensive molecular rearrangement, the pyrimidine 4 and the pyrroloimidazothiadiazine ...