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'Electron transfer' in keywords Facet   section ZfN Section B  [X]
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1Author    Wolfgang KaimRequires cookie*
 Title    Koordinationschemie reduzierter N-Heterozyklen. Komplexe des Pyrazin-Radikalanions mit Phenylmetallkationen +MPh von Beryllium, Magnesium und Zink Coordination Chemistry of Reduced N-Heterocycles. Complexes of Pyrazine Anion Radical with Phenyl Metal Cations + MPh of Beryllium, Magnesium and Zinc  
 Abstract    The diphenyls MPh2 (M = Be, Mg, Zn, Cd, Hg) have been reacted with pyrazine (Pz) in tetrahydrofuran. Only the magnesium derivative undergoes electron transfer to yield the 1:1 radical complex [Pz(MgPh)] -. However, in the presence of sodium or potassium persistent 1:2 complexes [Pz(MPh)2]t are formed with M = Be, Mg, Zn. Use of the higher homologues CdPh2 and HgPh2 leads to reduction to the metals. The 1:2 complexes have been characterized by ESR spectroscopy; metal coupling constants of 9 Be, 25 Mg and 67 Zn could be determined in natural isotopic abundance. 
  Reference    Z. Naturforsch. 36b, 1110—1116 (1981); eingegangen am 4. Mai 1981 
  Published    1981 
  Keywords    Pyrazine, Electron Transfer, Group II Aryls, Radical Complexes, ESR Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1110.pdf 
 Identifier    ZNB-1981-36b-1110 
 Volume    36 
2Author    Wolfgang KaimRequires cookie*
 Title    from the Single Electron Transfer Reaction of Diisobutylaluminum Hydride with N-Heterocycles  
 Abstract    Diisobutylaluminum hydride i Bu2AlH reacts with N-heterocycles L (L = pyrazine, 2,2'-bipyridine, 4,4'-bipyridine) via single electron transfer to vield 1:1 radical complexes [L(A1'BU2)-]. 
  Reference    Z. Naturforsch. 37b, 783—785 (1982); eingegangen am 27. November 1981 
  Published    1982 
  Keywords    Electron Transfer, N-Heterocycles, Diisobutylaluminum Hydride, Radical Complexes, ESR Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0783_n.pdf 
 Identifier    ZNB-1982-37b-0783_n 
 Volume    37 
3Author    Olefine, Hans-Dieter Hausen, Christian Bessenbacher, Wolfgang KaimRequires cookie*
 Title    Elektronenreiche  
 Abstract    Struktur und Elektrontransfer-Reaktivität des cyclisch <7/7r-hyperkonjugierten Carbosilans 3,3,6,6-Tetrakis(trimethylsilyl)-l,4-cyclohexadien Electron Rich Olefins, 2 Structure and Electron Transfer Reactivity of the Cyclically a/jr-Hyperconjugated Carbosilane 3,3,6,6-Tetrakis(trimethylsilyl)-l,4-cyclohexadiene Crystal and molecular structure analysis of the title compound 1, a most electron rich carbosi-lane, exhibits a shallow boat conformation for the cyclohexadiene ring which is shielded by four bulky Me 3 Si groups. Multiple hyperconjugative interaction occurs between the two non-conju-gated olefinic JZ systems and the four rather long (192 pm) carbon-silicon o bonds which form an angle of about 34° with the assumed JZ axis. The HOMO destabilization caused by this unique structural arrangement explains the energetically facile formation and subsequent reactivity of the cation radical 1 + which was found to undergo oxidative desilylation to the aromatic l,4-bis(tri-methylsilyl)benzene precursor in the single electron transfer reaction with TCNE. 
  Reference    Z. Naturforsch. 43b, 1087—1093 (1988); eingegangen am 11. Mai 1988 
  Published    1988 
  Keywords    Organosilicon Compounds, Molecular Conformation, Electron Transfer, Hyperconjugation, Electronic Structure 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1087.pdf 
 Identifier    ZNB-1988-43b-1087 
 Volume    43 
4Author    Fausto Calderazzo, Guido Pam, M. Artin Sperrlea, Ulli EnglertbRequires cookie*
 Title    Electron-and Ligand-Transfer Reactions Involving N,N-Dialkylcarbamates. Synthesis and Molecular Structure of V jIf^ -C C sH ^ yC ^ C N t^ H ^ h  
 Abstract    Electron-and ligand-transfer reactions o f low-valent organom etallic com pounds o f titanium and vanadium with N,N-dialkylcarbam ates o f titanium(IV) are reported. The reaction o f VCp2 (Cp = ^-cyclopentadienyl) with T i(0 2C N E t2)4 affords, inter alia, the dimeric vana-dium(III) N ,N-diethylcarbam ato derivative V2Cp2(0 2C N E t2)4 which has been studied by X-ray diffraction methods. Crystal data; triclinic, space group P i; a = 10.802(2), b = 11.004(1), c = 8.960(1) Ä; a = 112.879(9), ß = 102.66(1), y = 102.42(1)°; V = 902.3(6) A 3; Z = 1; F(000) = 368, gcalc = 1.282 g em -3; n = 5.47 cm -1. It consists o f a centrosymmetric dimer, the two vanadium atom s being surrounded by four oxygen atom s o f the bridging N,N-diethylcar-bamato groups and by the cyclopentadienyl ligand. The metal atom exhibits a distorted square-pyramidal coordination geometry with the oxygen atom s occupying the basal plane. The reaction o f TiCp2(CO)2 or Vmes2 (mes = //6-l,3 ,5 -M e3C6H 3) with T i(0 2C N E t2)4 affords Ti(III) and V(III) N,N-diethylcarbam ato derivatives by a simultaneous ligand-and electron-transfer reaction. M agnesium N ,N-diisopropylcarbam ate, M g (0 2CNPr'2)2, has been obtained by a ligand-transfer reaction between M gCp2 and T i(0 2CNPr'2)3. 
  Reference    Z. Naturforsch. 47b, 389 (1992); received A ugust 9 / October 16 1991 
  Published    1992 
  Keywords    N, N-D ialkylcarbam ates, Vanadium, Titanium, Cyclopentadienyl, Electron Transfer 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0389.pdf 
 Identifier    ZNB-1992-47b-0389 
 Volume    47 
5Author    H. Kunkely, A. VoglerRequires cookie*
 Title    Photoredox Decomposition of [Cobalamin-^-NC-Fen(CN)5]3* Induced by Metal-to-Metal Charge Transfer Excitation  
 Abstract    In the presence of oxygen aqueous solutions of the binuclear complex [cobalamin-^-NC-Fe(C N)5]3' undergo a redox photolysis (0 ~ 2 x 10'3 at Airr = 405 nm) which yields aquocoba-lamin and [Fe(C N)6]3\ It is suggested that this photoreaction is induced by direct metal-to-metal charge transfer (M M CT) excitation. On the contrary, [cobalamin-fx-NC-Ru(CN)5]3' is photo-inert because a reactive MMCT state is not accessible. 
  Reference    Z. Naturforsch. 51b, 245 (1996); received July 7 1995 
  Published    1996 
  Keywords    Vitamin B I2, Photolysis, Electron Transfer, Cyano Complexes, Iron 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0245.pdf 
 Identifier    ZNB-1996-51b-0245 
 Volume    51 
6Author    HeinzG 0 Becker, Dietmar Pfeifer, Reiner RadegliaRequires cookie*
 Title    Democratic Republic  
 Abstract    13 C and 15 N photo-CIDNP effects were determined for the reversible electron transfer from pyrene to arene diazonium salts on excitation of the charge transfer band at 360 nm. The diazonium salts being the products of back electron transfer ("cage products") show enhanced absorption for 13 C(1) and the 15 N-enriched diazonium group, whereas the escape products, ArH or lö N2, respectively, yield emission signals. It was shown that the inten-sities of the CIDNP effects depend on the rates of intersystem crossing kjSC within the geminate radical pair, i.e. on the magnetic nucleus used as a probe of the CIDNP effect. Using iH, 13 C or 15 N the time domain of observation can be manipulated in the ranges of 90-100 ns, 15-20 ns and 3-5 ns, respectively. Furthermore, the CIDNP intensities depend on the proper balance of the rate of electron back transfer, k_e, and the rate kp of formation of the escape product. Since k_e increases with increasing energy of the geminate radical pair, this balance and therefore the CIDNP intensities vary according to the substituent present and the electron donor used. 
  Reference    Z. Naturforsch. 38b, 1591—1597 (1983); received April 6 1983 
  Published    1983 
  Keywords    Photochemistry, Dediazoniation, Electron Transfer, Chemical Induced Nuclear Polarization (CIDNP), Arene Diazonium Salts 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1591.pdf 
 Identifier    ZNB-1983-38b-1591 
 Volume    38