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'Electron Transfer' in keywords Facet   Publication Year 1983  [X]
Facet   section ZfN Section B  [X]
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1983[X]
1Author    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