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'Nitrophenols' in keywords
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1981 (1)
1980 (1)
1979 (2)
1Author    Elli Theodoridou, Dimitrios JannakoudakisRequires cookie*
 Title    Elektrochemisches Verhalten der Nitrophenole und ihrer Reduktionsprodukte an Graphitelektroden Electrochemical Behavior of the Nitrophenols and Their Reduction Products at Graphite Electrodes  
 Abstract    The electrochemical reduction of the isomeric nitrophenols at graphite electrodes is investigated in aqueous solutions with pH = 1-13 and is compared with the electro-chemical oxidation of their reduction products. o-Nitrophenol and jo-nitrophenol are reduced to the corresponding amines, as the observed oxidation peaks in their cyclic voltammograms can be simulated by those of o-and p-aminophenol. m-Nitrophenol is reduced to m -hydroxylaminophenol, as its oxidation peak appears at much more negative » potential than that of m-aminophenol, within the potential range of the oxidation of phenylhydroxylamine. The pH-dependence of the reduction potentials of the nitrophenols at the graphite electrodes is discussed in comparison with that at a hanging mercury drop electrode. 
  Reference    Z. Naturforsch. 36b, 840—845 (1981); eingegangen am 12. Februar 1981 
  Published    1981 
  Keywords    Cyclic Yoltammetry, Nitrophenols, Graphite Electrodes 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0840.pdf 
 Identifier    ZNB-1981-36b-0840 
 Volume    36 
2Author    M. M. Aly, A. M. ShalabyRequires cookie*
 Title    The Isolation and Characterization of Molecular Complexes Produced from the Reaction of Nitrophenols with Divalent Metal Oxinates  
 Abstract    The reaction of nitrophenols (picric acid, 2,6-dinitrophenol, and 2,4-dinitrophenol) with divalent metal oxinate (metal = Cu, Co, Ni, Mn, and Zn) produced a type of molecular complex, which comprises two molecules of the metal oxinate and one molecule of the nitrophenol. In the case of the Mg complex the ratio is 1:1. A definite charge-transfer band is detected for the Co(II) complex. A hydrogen bonding system 0I...H+...02 is suggested. This includes the proton of the nitrophenol and two oxygen atoms; each is related to a coordinated oxinate of two different metal oxinate molecules. Analytical and spectral evidence are in accordance with the tentatively suggested formulations. 
  Reference    Z. Naturforsch. 34b, 230—234 (1979); received July 31 1978 
  Published    1979 
  Keywords    Nitrophenols, Divalent Metal Oxinates, Molecular Complexes 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0230.pdf 
 Identifier    ZNB-1979-34b-0230 
 Volume    34 
3Author    Dimitrios Jannakoudakis, Elli TheodoridouRequires cookie*
 Title    Über den Einfluß des pH-Wertes auf die polarographische Reduktion der Nitrophenole mit und ohne Zusatz von Campher On the Influence of the pH Value on the Polarographic Reduction of the Nitrophenols in Presence and Absence of Campher  
 Abstract    The Polarographie behavior of the nitrophenols in the pH range 1-13 and the in-fluence of campher on the polarographic curves are studied. The pH dependence of the half wave potentials and the different reduction of the depolarizers in their molecular or anionic form are discussed. 
  Reference    Z. Naturforsch. 35b, 705—708 (1980); eingegangen am 8. Februar 1980 
  Published    1980 
  Keywords    Nitrophenols, Polarography, Half Wave Potential, Inhibitor 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0705.pdf 
 Identifier    ZNB-1980-35b-0705 
 Volume    35 
4Author    A. Trebst, S. R. Eim Er, W. Draber, H. J. KnopsRequires cookie*
 Title    The Effect of Analogues of Dibromothymoquinone and of Bromonitrothymol on Photosynthetic Electron Flow  
 Abstract    Alkyl substituted derivatives of halogenated p-benzoquinones, of halogenated /7-nitrophenols, and of 2,4-dinitrophenols were tested in the inhibition of photosynthetic electron flow in chloro­ plasts. The effect of the compounds on photoreductions by photosystem I or II, on a TMPD bypass in NADPH formation and the reversibility of the inhibition by dithiothreitol is used to distin­ guish between an inhibition site before or after plastoquinone function, i. e. between a DBMIB versus a DCMU inhibition pattern. It is shown, that different isopropyl and /-butyl substituted halogenated p-benzoquinones are as effective and specific as DBMIB in the inhibition of plastoquinone function. Alkyl substituted /^-nitrophenols, with an additional halogen-or nitro-group at C-2, are shown to be effective electron flow inhibitors. The new potent nitrophenol derivatives inhibit at the site of DCMU action, nevertheless they do not contain the basic chemical element essential for inhibi­ tion common to DCMU and its many herbicidal analogues. Small changes in the ring-substitution can alter the inhibition pattern from a DCMU typ to a DBMIB typ inhibition. 
  Reference    Z. Naturforsch. 34c, 831 (1979); received June 1 1979 
  Published    1979 
  Keywords    Photosynthesis, Inhibitors, Herbicides, Dibromothymoquinone, Nitrophenols, Chloroplast 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0831.pdf 
 Identifier    ZNC-1979-34c-0831 
 Volume    34