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1Author    ThomasJ. Zimmermann, ThomasJ J MüllerRequires cookie*
 Title    Electrolysis of Tetrakis(4-iV,./V-dimethylammophenyl)methane -Fragmentation of a Tetraarylmethane under Oxidative Conditions  
 Abstract    Upon anodic oxidation tetrakis(4-A^,Ar-dimethylaminophenyl)methane (3) fragments to give the stable species crystal violet (6), N,N,N',N'-and Michler' s hydrol blue (12) that can be readily absorption bands. 
  Reference    Z. Naturforsch. 56b, 1349—1353 (2001); received August 31 2001 
  Published    2001 
  Keywords    Cyclic Voltammetry, Redox Chemistry, Tetraarylmethanes 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-1349.pdf 
 Identifier    ZNB-2001-56b-1349 
 Volume    56 
2Author    Alexander Lichtblau, Hans-Dieter Hausen, Wolfgang KaimRequires cookie*
 Title    First Structural Characterization of an Easily Oxidized Derivative o f 1,4-Dihydroquinoxaline  
 Abstract    The first crystal structure analysis o f a 1,4-dihydroquinoxaline is described by example o f the l,4-bis(re/-/-butyldimethylsilyl) derivative. In the solid state, this molecule exhibits a non-planar heterocycle with a dihedral angle o f 156.3° along the N -N axis in the boat-shaped 87r electron ring system. The alkyl groups o f the Si(/er/-Bu)M e2 substituents are arranged as to minimize steric repulsion. Despite the reduced n electron conjugation due to non-planarity, the com pound is oxidized reversibly to an EPR detectable radical cation at -0 .5 9 V vs. ferro­ cene in dichloromethane. However, the second oxidation to the fully aromatic dication is elec-trochemically irreversible. A comparison with previously obtained results illustrates the struc­ tural flexibility o f the non-aromatic 1,4-dihydro-1,4-diazine ring system which is strongly affected by rather weak non-bonded interactions. 
  Reference    Z. Naturforsch. 48b, 713 (1993); eingegangen am 21. Dezember 1992 
  Published    1993 
  Keywords    Heterocycles, Organosilicon Compounds, Crystal Structure, Cyclic Voltammetry, Conformation 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0713.pdf 
 Identifier    ZNB-1993-48b-0713 
 Volume    48 
3Author    Ralf Keuper, Nikolaus RischRequires cookie*
 Title    Ruthenium(II)-Komplexe mit neuartigen 1,10-Phenanthrolinliganden Ruthenium (II) Complexes with New Kinds of 1.10-Phenanthrolin Ligands  
 Abstract    Different pathways to Ru-com plexes are described using the hitherto unknown S-type terpyridines 3 and the known U-type ligands 4. The resulting hexafluorophosphates 6 and 7 have been spectroscopically characterized by 'H NM R and IR data and also by mass spectro­ metry and cyclic voltammetry. 
  Reference    Z. Naturforsch. 50b, 1115—1120 (1995); eingegangen am 7. Februar 1995 
  Published    1995 
  Keywords    Terpyridines, Ruthenium, NM R Spectra, Cyclic Voltammetry 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1115.pdf 
 Identifier    ZNB-1995-50b-1115 
 Volume    50 
4Author    Yoshimitsu Yamazaki, MidoriG. Oto1, ^. Yu-Ichi, Takenori Kageyama, Hiroaki Tomohiro, OkunoRequires cookie*
 Title    Structure of Chloro(cyclopentadienone)- (cyclopentadienyl)ruthenium and its Cytotoxic Activity  
 Abstract    The structure of R u(cpO)(cp)C l com plex (3), which was precipitated from aqueous solutions of R u(cp)2Cl+PF6' (1), was determined by X-ray crystallographic analysis. The Ru-halogen bond distance was shorter and the dihedral angle be­ tween the rings was larger than the values re­ ported for the corresponding Br analogue, R u(cpO)(cp)Br (4). The com plex 3 (IC50 1 09 /iM) was more cytotoxic than 1 (IC50 163 //M) against mouse sarcoma S I80 cells, but less toxic than 4 (IC50 72 ,/M). 
  Reference    Z. Naturforsch. 51b, 301 (1996); received September 21 1995 
  Published    1996 
  Keywords    Ruthenium Complex, Cytotoxicity, X-Ray, Cyclic Voltammetry 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0301_n.pdf 
 Identifier    ZNB-1996-51b-0301_n 
 Volume    51 
5Author    Ating Giirkan, AhmetM. Yilmaz, Saim Önal, ÖzkarRequires cookie*
 Title    Electrochemical Study of Tricarbonyl(y;6-cyclooctatetraene)metal(0) Complexes of the Group 6 Elements  
 Abstract    Tricarbonyl(?76-cyclooctatetraene)metal(0) complexes of the group 6 elements were prepared by using the procedures described in the literature with some minor modifications and identi­ fied by IR and NMR spectroscopy. Their electrochemical behavior was studied by using cyclic voltammetry in dichloromethane solution containing 0.1 M tetrabutylammonium tetrafiuorob-orate as supporting electrolyte. Their oxidation and reduction potentials were measured and discussed in terms of the frontier energy levels in connection with the UV-Visible electronic ab­ sorption spectral data. In order to elucidate the mechanism of electrooxidation of the complexes, constant potential electrolysis was performed for one representative example, tricarbonyl(^6-cyclooctatetraene)chromium(O). The IR monitoring of the reaction showed that it is gradually converted to hexacarbonylchromium(O) upon electrolysis at constant potential. 
  Reference    Z. Naturforsch. 53b, 875—880 (1998); received March 9 1998 
  Published    1998 
  Keywords    Carbonyl, Chromium, Molybdenum, Tungsten, Cyclic Voltammetry 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0875.pdf 
 Identifier    ZNB-1998-53b-0875 
 Volume    53 
6Author    Elli Theodoridou, Pantelis Karabinas, Dimitrios JannakoudakisRequires cookie*
 Title    Elektrochemisches Verhalten der Nitrophenole und ihrer Reduktionsprodukte an Graphitelektroden, II Mechanismus und Kinetik Electrochemical Behavior of the Nitrophenols and their Reduction Products at Graphite Electrodes, II Mechanism and Kinetic  
 Abstract    The mechanism of the electrochemical reactions of l-nitro-2-naphthol, o-nitrophenol and p-nitrophenol at carbon fibre electrodes is investigated in aqueous solutions with pH= 1-10. The above nitrophenols are reduced to the corresponding amines, which are reoxidized to quinone imines. As the quinone imines are partially hydrolysed to quinones, the kinetic of this hydrolysis reaction is also examined. In the case of l-nitro-2-naphthol the hydrolysis rate constant of 1,2-naphthoquinone imine is estimated as a function of pH by cyclic voltammetry. 
  Reference    (Z. Naturforsch. 37b, 97—101 [1982]; eingegangen am 14. September 1981) 
  Published    1982 
  Keywords    Cyclic Voltammetry, Graphite Electrodes, o-Nitrophenol, 1, 2-Naphthoquinoneimine 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0097.pdf 
 Identifier    ZNB-1982-37b-0097 
 Volume    37 
7Author    Christoph Eischenbroich, Edgar Bilger, Reinhart MöckelRequires cookie*
 Title    Metall-7r-Komplexe von Benzolderivaten, XX [1] Über die Cokondensation des Phenanthrens mit Chromatomen - Reaktivität, Redoxverhalten, ESR-und NMR-spektroskopische Untersuchungen Metal-^-Complexes of Benzene Derivatives, XX [1] Cocondensation of Phenanthrene with Chromium Atoms - Reactivity, Redox Behavior, ESR and NMR Spectroscopic Investigation  
 Abstract    Cocondensation of chromium atoms with phenanthrene vapor affords bis(^ 1 ' 2 ' 3 ' 4 ' 10a -4a -phenanthrene)chromium (4). X H NMR spectroscopy reveals, that the diastereomers 4 (rac) and 4' (meso) are formed in a 2:1 ratio. Cyclic voltammetric studies on 4 show, that four oxidation states are accessible: 4t, 4, 4t, 4 2+ [E° = —2.235 (rev.), —0.651 (rev.), + 0.82 (irrev.) V vs. SCE]. The radical ions 4t and 4 7 are characterized by ESR spectro-scopy in fluid and rigid solutions. Prominent feature of these species is the inverse relative magnitude of the g-tensor components: gn(41") > gi(4t); gn(47) < gi(47). 
  Reference    Z. Naturforsch. 38b, 1357—1364 (1983); eingegangen am 30. Juni 1983 
  Published    1983 
  Keywords    Cocondensation, Condensed Arenes, Bis(arene)transitionmetal Complexes, ESR Spectroscopy, Cyclic Voltammetry 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1357.pdf 
 Identifier    ZNB-1983-38b-1357 
 Volume    38 
8Author    Michel Mégnamisi-Bélombé, Irene Jokwi, Emmanuel Ngameni, R. Obert Roux, Bernhard NuberRequires cookie*
 Title    X-Ray Structure, Electrochemical and Electronic Spectroscopic Examination of Cobaloximatic Acid: Hydro-fraw5-diiodobis(ethanedioximato(l-)-N,N')cobaltate(III). Extended Intermolecular O-H-O Bridging in the Solid  
 Abstract    The structure of the cobaloximatic acid, hydro-rrans-diiodobis(ethanedioximato(l-)-N,N')cobaltate(III), has been determined by X-ray diffraction. Crystal data: C4H7CoI2N40 4, Mr = 487.87; monoclinic space group P2xta (C|h); a -10.795(7), b = 9.003(7), c = 11.881(6) Ä; ß = 97.29(6)°; V = 1145.35 Ä3; Z = 4; dc = 2.83 Mg n r3. Rw (R) = 3.6 (3.9)% for 3064 observed independent reflections and 148 parameters. The coordination geometry around Com is a dis­ torted (4 + 2) octahedron of four chelating equatorial N atoms and two apical iodides. The compound is most adequately formulated as a monovalent strong acid: H(Co(GH)2I2) (GH_ = ethanedioximate or glyoximate). The H atoms of the oxime groups are involved in the usual mframolecular, as well as in much stronger internlolecular O -H -O bridgings (O — Ointramol = 2.613-2.631, O — Ointervo, = 2.454 Ä). The "acidic" H atom of each molecule participates in the intennolecular bridging which extends throughout the structure, and propagates nearly parallel to the [101] crystallographic direction. The redox properties of the present compound were examined by cyclic voltammetry in acetonitrile solution at room tem­ perature. Redox waves attributed to the reduction of Co11 1 and to the oxidation of T were ob­ served, along with a wave which may be linked to the reduction of the "acidic" proton. 
  Reference    Z. Naturforsch. 48b, 1360—1364 (1993); received May 17 1993 
  Published    1993 
  Keywords    X-Ray, Cobaloximatic Acid, Extended Hydrogen Bridging, Cyclic Voltammetry 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1360.pdf 
 Identifier    ZNB-1993-48b-1360 
 Volume    48 
9Author    Meyer Zu Köcker, Andreas Behrendt, K. Urt Dehnicke, Dieter FenskeRequires cookie*
 Title    Phosphaniminato-Cluster des  
 Abstract    Kupfers. Synthese und Kristallstrukturen von ICu6Cl6(NPM e3)4|Cl[Me3SiNPM e3| • CH2C12 und ICu6Cl6(NPM e3)4l[Cu(Me3SiNPM e3)2lCl2 Phosphoraneim inato Clusters o f Copper. Syntheses and Crystal Structures of [Cu6Cl6(N PM e3)4]Cl[Me3SiNPM e3] • C H 2C12 and [Cu6Cl6(NPM e3)4][Cu(Me3SiNPM e3)2]Cl2 R olf The title com pounds have been prepared as black-blue crystals with metallic lustre by the reaction o f CuCl2 and CuCl, respectively, with M e3SiN P M e3 in C H 2C12 suspensions. The com ­ plexes have been characterized by cyclic voltammetry and by crystal structure determinations. [Cu6Cl6(N P M e3)4]Cl[M e3SiN P M e3] • C H 2C12: Space group P 2,2,2,, Z = 4, structure solution with 4407 unique observed reflections, R = 0.057. Lattice dimensions at -7 0 °C: a -1159.3(8), b = 2027.1(14), c = 2063.3(12) pm. The compound consists o f cluster ions [Cu6Cl6(N P M e3)4]+, in which the copper atom s form a regular octahedron. Four planes o f the octahedra are capped by //3-nitrogen atom s o f the (N P M e3)~ groups. Each o f the Cu atom s is connected with a terminal chlorine atom . Another chloride ion serves for charge com pensa­ tion; this ion occupies another Cu3 plane o f the octahedron. W ithout bonding interaction one M e3SiN P M e3 molecule and one C H 2C12 molecule are included in the lattice. [Cu6Cl6(N P M e3)4][Cu(M e3SiN P M e3)2]Cl2: Space group Pna2,, Z = 4, structure solution with 5676 unique observed reflections, R = 0.071. Lattice dimensions at -7 0 °C: a = 3117.2(21), b = 1927.4(11), c = 1002.7(8) pm. The compound consists o f cluster ions [Cu6Cl6(N P M e3)4]+, the com plex ion [Cu(M e3SiN PM e3)2]+, and chloride ions. In the cation [Cu(Me3SiN P M e3)2]+ the copper atom is linearly coordinated by the nitrogen atom s o f the phosphaneimine m olecules. 
  Reference    Z. Naturforsch. 49b, 301—3 (1994); eingegangen am 18. November 1993 
  Published    1994 
  Keywords    Phosphoraneim inato Clusters o f Copper, Synthesis, Cyclic Voltammetry, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0301.pdf 
 Identifier    ZNB-1994-49b-0301 
 Volume    49 
10Author    Evy Manessi-Zoupa, TheodorosF. Zafiropoulos, SpyrosP. PerlepesRequires cookie*
 Title    Preparation and Properties of Rhodium(III) Complexes with the T etr adentate Ligand N,N'-Bis(2'-py ridi neearbox am ide)-1,8-naphthalene  
 Abstract    Synthetic procedures are described that allow access to a number of new Rh(III) complexes with the tetradentate bis-amide ligand N,N'-bis(2'-pyridinecarboxamide)-1,8-naphthalene (LH2). These complexes have the formulae Rh(LH2)Cl3, Na[RhLX2] • H20 (X = Cl, CN) and [RhLA2]C104 (A = pyridine, 1-methylbenzotriazole). The compounds have been characterized by elemental analyses, conductivity measurements, X-ray powder patterns, spectroscopic (IR, UV/VIS, 'H NMR) studies and electrochemical methods. The neutral amide behaves as a bis-bidentate ligand in the oligomeric or polymeric, octahedral complex Rh(LH,)Cl3. Monomeric, trans octahedral structures are assigned for the complexes o f L2" in the solid state; the doubly deprotonated ligand acts as a tetradentate chelating agent with the four nitrogens as ligating atoms. 
  Reference    (Z. Naturforsch. 49b, 111 [1994]; received June 14 1993) 
  Published    1994 
  Keywords    Rhodium(III) Complexes, Bis-amide Ligands, IR Spectra, 'H NM R Spectra, Cyclic Voltammetry 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0111.pdf 
 Identifier    ZNB-1994-49b-0111 
 Volume    49 
11Author    H. Einer, HomborgRequires cookie*
 Title    Inin -Phthalocyanine: Darstellung, Eigenschaften und Kristallstruktur von £-Bis(triphenylphosphin)iminium-as-di(cyanato(N))phthalocyaninato- (2-)indat(III)  
 Abstract    In111 Phthalocyanines: Synthesis, Properties and Crystal Structure of Z?-Bis(triphenylphosphine)iminium c/5-D i(cyanato(N))phthalocyaninato(2-)indate(III) B arbara Aßm ann, A ndreas Franken, [In(Cl)Pc2~] reacts with bis(triphenylphosphine)iminium cyanate ((PNP)OCN) in dichlo-romethane to yield green-blue *(PNP) [In(NCO)2Pc2_] • CH2C12, which crystallizes in the triclinic space group Pi (No. 2) with Z = 2. The two cyanato(N) ligands are in a mutually cis coordination (Z (NNCO-In -N NCO) = 84.2(3)°). The In atom is displaced out of the plane of the four N,.vo atoms towards the two cyanato(N) ligands (d(In-Ct(N,JO)4) = 0.988 A). The average In-N NC0 and In-N,.so bond distances are 2.16(1) and 2.216(8) A, respectively. The NNco-In -NNCO moiety deviates by ~ 4° from the staggered conformation relative to the In-(N,,")4 sceleton. Though the cyanato(N) ligands are essentially linear, there are different In-N -C angles (164.4(9) and 147.1(8)°) probably due to crystal packing effects. The Pc2~ ligand is distorted in an asymmetrically convex manner. The PNP cation adopts the bent conformation (Z(P-N(K)-P) = 143.5(6)°). The cyclic voltammogram shows three electrode processes, which are assigned to the redox pairs: Pc ~/Pc2~ (-0.87 V) < In'/In111 (-0.63 V) < Pc~_ /Pc~ (0.69 V). The UV-VIS-NIR spectra and the vibrational spectra are discussed. 
  Reference    Z. Naturforsch. 51b, 325—332 (1996); eingegangen am 21. August 1995 
  Published    1996 
  Keywords    Indium(III) Phthalocyanines, Cyanato(N) Complex, Cyclic Voltammetry, Crystal Structure, Optical and Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0325.pdf 
 Identifier    ZNB-1996-51b-0325 
 Volume    51 
12Author    Klaus-Wilhelm Stender, Günter Klar, Dierk KnittelRequires cookie*
 Title    Elektrochemisches Verhalten von Dibenzodichalkogeninen und verwandten Verbindungen Electrochemical Behavior of Dibenzodichalcogenins and Related Compounds  
  Reference    Z. Naturforsch. 40b, 774—781 (1985); eingegangen am 8. März 1985 
  Published    1985 
  Keywords    Thianthrenes, Selenanthrenes, 2, 2'-Dithiobiphenyls, Cyclic Voltammetry, 4, 4', 5, 5'-Tetramethoxy-2, 2'-dithiobiphenyl 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0774.pdf 
 Identifier    ZNB-1985-40b-0774 
 Volume    40