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1990 (1)
1988 (1)
1986 (2)
1Author    ShyamK. Singh, LindsayA. SummersRequires cookie*
 Title      
 Abstract    Departm ent o f Chem istry, The U niversity o f N ew castle, Reaction o f 2,3'-bipyridine with dibrom oalkanes affords both r-brom oalkyl-2,3'-bipyridinium bromides and l',l"'-(alkanediyl)-bis-2,3'-bipyridinium dibromides. The latter diquaternary salts react with dimethyl sulfate to afford r,l'" -(alk anediyl)-b is-(l-m ethyl-2,3'-bip yridinium) tetra­ quaternary salts which are reduced to diradical dications at potentials (E 0) o f about —0.47 V to -0 .6 2 V. 
  Reference    Z. Naturforsch. 41b, 239 (1986); received Septem ber 19 1985 
  Published    1986 
  Keywords    2, 3'-Bipyridinium Tetraquaternary Salts, Reduction Potentials, Diradical Dications 
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 TEI-XML for    default:Reihe_B/41/ZNB-1986-41b-0239.pdf 
 Identifier    ZNB-1986-41b-0239 
 Volume    41 
2Author    Joanne Mcgeachie, LindsayA. SummersRequires cookie*
 Title    Formation of Triradical Trications from Hexaquaternary Salts Derived from 4,4'-Bipyridine  
 Abstract    The syntheses of the hexaquaternary salts l,l'-bis-[2-(r-methyl-[4,4'-bipyridinium]-l-yl)-ethyl]-4,4'-bipyridinium hexaperchlorate and l,l'-bis-[3-(l'-methyl-[4,4'-bipyridinium]-l-yl)-propyl]-4,4'-bipyridinium hexaperchlorate are reported. The salts are reduced in aqueous solu­ tion to triradical trications at a potential (E0) of —0.24 V. We recently reported the preparation of tetra-quaternary salts derived from 4,4'-bipyridine of the 
  Reference    Z. Naturforsch. 41b, 1255—1259 (1986); received April 17 1986 
  Published    1986 
  Keywords    4, 4'-Bipyridinium Hexaquaternary Salts, Reduction Potentials, Triradical Trications 
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 TEI-XML for    default:Reihe_B/41/ZNB-1986-41b-1255.pdf 
 Identifier    ZNB-1986-41b-1255 
 Volume    41 
3Author    ShyamK. Singh, LindsayA. Summers, LarryA. HickRequires cookie*
 Title    Synthesis of Quaternary Salts from 3,3 -Bipyridine and Dibromoalkanes  
 Abstract    Reaction of 3,3'-bipyridine with 1,3-dibromopropane, 1,4-dibromobutane, 1.5-dibromo-pentane, 1,6-dibromohexane. 1,7-dibromoheptane and 1.8-dibromooctane affords the correspond-ing bridged diquaternary salts, the structures of which were confirmed by fast atom bombardment mass spectrometry. Reaction with 1,2-bromoethane gives instead l.l"-(1,2-ethanediyl)-bis-3.3'-bipyridinium dibromide. 
  Reference    Z. Naturforsch. 43b, 778—784 (1988); received November 12. 1987 
  Published    1988 
  Keywords    3, 3'-Bipyridinium Quaternary Salts, Fast Atom Bombardment Mass Spectra, Reduction Potentials 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0778.pdf 
 Identifier    ZNB-1988-43b-0778 
 Volume    43 
4Author    Á. Vez, C. Rés, M. Isternas, O. Argarita, E. Tero, R. Nrique, U. Lr Ic, LlerRequires cookie*
 Title    Syntheses and Electrochemical Properties of |C5M e5Ru]+ Complexes with Polycyclic Arenes. Crystal Structure of |(C5M e5)Ru( //'-chrysene)] PF6 * 0.5 M e2CO  
 Abstract    M ononuclear and binuclear com pounds [(C5M e5)Ru(//6-arene)PF6 and [(C5M e5R u)2(//6,/76-arene)](PF6)-, were prepared by reacting (C5M e5)RuCl2, the arene and silver acetate with subsequent addition o f N H 4PF6, for arene = phenanthrene, chrysene, tripheny-lene, fluorene, bifluorene. biphenyl and 4,4'-biphenyl. The mononuclear com pounds were also prepared for arene = naphthalene, anthracene, pyrene and coronene. The 'H and l3C N M R spectra are reported. By cyclic voltammetry all compounds show a first reduction potential that is considerably more positive compared with the free arene. The first cathodic wave is irreversible for a wide range o f scanning speeds. However, the mononuclear coronene and the binuclear phenanthrene com pounds show reversibility. The crystal structure o f [(CsM es)Ru(/76-chrysene)]PF6-0.5 Me^CO was determined by X-ray diffraction (3797 unique observed reflexions, R = 0.098). Crystal data: a = 1689.2(2), b = 1524.0(8), c = 2263.5(3) pm, ß = 107.22(1) , space group P 2,/«, Z = 8. Crystallographically independent, two cations [(C5M e5)Ru(>76-chrysene)]+ and two anions PF6~ are present, but their structures are essentially equal. The [C5M esRu]+ unit is bonded to one o f the terminal benzene rings o f the chrysene in a sandwich manner; the rings bonded to Ru are nearly coplanar. The PF6~ ions and the C5M e5 rings exhibit strong thermal vibrations. 
  Reference    Z. Naturforsch. 45b, 658 (1990); received November 18 1989 
  Published    1990 
  Keywords    Pentamethylcyclopentadienyl-arene-ruthenium Hexafluorophosphates Synthesis, N M R Spectra, Reduction Potentials, Crystal Structure 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-0658.pdf 
 Identifier    ZNB-1990-45b-0658 
 Volume    45