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2001 (1)
2000 (1)
1Author    VeliT. KasumovRequires cookie*
 Title    Oxovanadium(IV), Nickel(II) and Palladium(II) Complexes of Tridentate Salicylaldiminates Derived from 2,4-Di-terMmtyl-6-aminophenol  
 Abstract    Several new binuclear nickel(II), oxovanadium(IV) and palladium(II) complexes (MLX) of tridentate salicylaldimines (LX H2) obtained from substituted salicylaldehydes and 2,4-di-tert-butyl-6-aminophenol, as well as mononuclear nickel(II) and oxovanadium(IV), MQx nH20, complexes with hydrogenated LX H2 ligands (QXH2) have been prepared and their spectroscopic, magnetic and catalytic activity (for PdLx) have been investigated. NiLx and VOLx complexes when dissolved in pyridine, take up three or two pyridine molecules to form six coordinated complexes, respectively. The Ni(II) and VO(IV) complexes obtained from QXH2 can be formu­ lated as NiQx-3H20 and VOQx H2O. All VO(IV) complexes have been characterized by ESR parameters. It has been found that some PdLx complexes without any preliminary activation, in EtOH, THF and DMF exhibit high catalytic activity in the hydrogenation of nitrobenzene or cyclohexene at room temperature and at 30 -40 °C under 760 torr H2. When this reaction has been carried out in the ESR cavity at room temperature the triplet of 12 line multiplets due to the nitroxyl type coordinated radical (g = 2.013, AN = 10 G, A = 0.8 G) was detected. 
  Reference    Z. Naturforsch. 56b, 263—270 (2001); received July 27 2000 
  Published    2001 
  Keywords    Tridentate Salicylaldiminates, ESR, Catalytic Activity 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0263.pdf 
 Identifier    ZNB-2001-56b-0263 
 Volume    56 
2Author    Elena Horozova, Nina Dimcheva, Zinaida JordanovaRequires cookie*
 Title    Catalytic Decomposition of 3-Chloroperoxybenzoic Acid by Immobilized Catalase in a Non-Aqueous Medium  
 Abstract    Catalytic activities of catalase (C A T) immobilized on graphite -G M Z ™ , soot -"N O R IT " and "PM -100" to mediate decomposition of 3-C l-C 6H 4CO O O H (3-C P B A) in ace-tonitrile have been investigated. Under these conditions, the kinetic param eters K m, k, E a, ^ a x , and Zo were calculated. Conclusions on a probable mechanism of the catalytic process observed were drawn from the calculated values of A G *, AH *, and AS*. A quantitative UV-spectrophotometrical approach was used as the basic analytical tool. The electrochem ical reduction of oxygen generated in enzyme catalysed 3-C P B A decomposition was examined with polarization curves method. 
  Reference    Z. Naturforsch. 55c, 55—5 (2000); received February 22/September 28 1999 
  Published    2000 
  Keywords    Catalase, Immobilized Enzyme, Carbon Materials, Acetonitrile Medium, Catalytic Activity 
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 TEI-XML for    default:Reihe_C/55/ZNC-2000-55c-0055.pdf 
 Identifier    ZNC-2000-55c-0055 
 Volume    55