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1978 (3)
1Author    T. Platzner, J. K. ThomasRequires cookie*
 Title    Fluorescence and Proton Nuclear Magnetic Resonance Studies of Thallous Ions - Crown Ether Complexes in Organic Solvents  
 Abstract    The complexing of thallous ions (T1+), with the crown ether dibenzo 18 crown-6 poly-ether (DB) has been studied by NMR, fluorescence, and pulse radiolysis techniques. NMR data show a strong interaction of the T1+ ions with the aromatic moieties. This is also illustrated by a static quenching of the aromatic fluorescence by Tl + . The rates of reactions of T1+ with hydrated electrons eaq~ and pyrene excited singlet states are decreases on complexing the ion by the crown ether. 
  Reference    Z. Naturforsch. 33b, 614—618 (1978); received December 12 1977/March 13 1978 
  Published    1978 
  Keywords    Photochemistry, Fluorescence, Crown Ethers, Biology 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0614.pdf 
 Identifier    ZNB-1978-33b-0614 
 Volume    33 
2Author    Walter FabianRequires cookie*
 Title    Semiempirische SCF-Rechnungen an den angeregten Zuständen von Hydroxy Cumarinen Semiempirical SCF-Calculations of the Excited States of Hydroxycoumarines  
 Abstract    Semiempirical SCF-calculations show that the fluorescence bands of 7-hydroxycoumarin at 1.87 • 10 4 -1,92 • 10 4 cm -1 are most probably due to a phototautomeric form. A topo-logical rule is evaluated to explain the dependence of the fluorescence intensity upon the position of the hydroxyl group in the various isomeric hydroxycoumarines. 
  Reference    Z. Naturforsch. 33b, 628—631 (1978); eingegangen am 16. März 1978 
  Published    1978 
  Keywords    Hydroxycoumarines, Fluorescence, Phototautomerism, PPP-Calculations 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0628.pdf 
 Identifier    ZNB-1978-33b-0628 
 Volume    33 
3Author    Herrn, Dr, DrRequires cookie*
 Title    Transanulare Wechselwirkung bei  
 Abstract    [m.n]Phanen, 32 [1]: Modelle für Amin-Aromaten-Exciplexe: [2](l,4)Anthraceno[2](2,6)pyridinophan-l,13-dien Transanular Interaction in [m .n]Phanes, 32 [1 ]: Models for Am ine-A rene-Exciplexes: [2](l,4)A nthraceno[2](2,6)pyridinophan-l,13-dien M atthias W. H a e n e l* 3, Birgit L intnera und D ieter Schweitzer11 a M ax-Planck-Institut für K ohlenforschung, Kaiser-W ilhelm -Platz 1, D-4330 M ülheim a .d . Ruhr b M ax-Planck-Institut für M edizinische Forschung, A bteilung M olekulare Physik, Jahnstraße 29, D -6900 H eidelberg The [2](1.4)A nthracen o[2](2,6)pyridinop han-l,13-d ien (5) and the corresponding [2.2]phane (7) were synthesized as m odels for exciplexes. The dithia[3.3]phanes (9) and (11) were prepared by cyclisation o f the dithiols 13 and 16 with the dibrom ide 19. O xidation of 9 to the disulfone 10 and vapour phase pyrolysis led to 7. Ring contraction o f 9 by S-analogous Wittig ether rearrange­ ment led to 20 which was converted to the diene 5 via oxidation to the disulfoxide 21 and pyrolytic elim ination o f m ethane sulfenic acid. A ttem pts to prepare 6 and 8 via similar routes from 11 failed. Electron absorption spectra and fluorescence spectra o f 5 and 7 are discussed in terms of n-n interaction in 5 and jt-jt interaction in 7. 
  Reference    Z. Naturforsch. 41b, 223 (1986); eingegangen am 7. Oktober 1985 
  Published    1986 
  Keywords    Cyclophanes, Electronic Interaction, Exciplex M odels U V Spectra, Fluorescence 
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 TEI-XML for    default:Reihe_B/41/ZNB-1986-41b-0223.pdf 
 Identifier    ZNB-1986-41b-0223 
 Volume    41 
4Author    Snezhana Bakalova, Ivanka KavrakovaRequires cookie*
 Title    Electronic Spectra and Photochemical Properties of Acetyldihydroquinolinones  
 Abstract    The absorption and luminescence properties o f 6-acetyl-2,3-dihydro-4(lH)-quinolinone are described and compared to those of the parent 2,3-dihydro-4(lH)-quinolinone. The character of the electronic transitions is determined by PPP quantum chemical calculations. An N-acyl migration leading to the form ation of 6-acetyl-2,3-dihydro-4(lH)-quinolinone takes place upon UV irradiation or heating with polyphosphoric acid o f 1-acetyl-2,3-dihydro-4(lH)-quinolinone. A radical mechanism of the photochemical rearrangem ent is proposed. 
  Reference    Z. Naturforsch. 47b, 1775—1778 (1992); received April 4 1992 
  Published    1992 
  Keywords    D ihydroquinolinone, Fluorescence, Rearrangement, Photochemical Properties 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1775.pdf 
 Identifier    ZNB-1992-47b-1775 
 Volume    47 
5Author    G. C. Papavassiliou, G. A. Mousdis, I. B. KoutselasRequires cookie*
 Title    Some Organic-Inorganic Hybrid Compounds Based on «ö-Thiuronium Cations and Lead Halide Anions  
 Abstract    Using 1-chlorodecane (C10H21CI), benzyl chloride (C6H5CH2CI), a,a'-dichloro-p-xylene (CICH2C6H4CH2CI), 4-phenylbenzyl chloride (C6H5C6H4CH2CI), 2-bromomethyl-naphthal-ene (CioHyC^Br), 4-bromomethyl-7-methoxycoumarin (CioHzO^C^Br), 2-bromomethyl-anthraquinone (CuH TC ^C ^Br), 9-chloromethyl-anthracene (C14H9CH2CI), thiourea and halides as starting materials, the organic-inorganic hybrid compounds [CioH2iSC(NH2)2]2Pbl4, [C6H5CH2SC(NH2)2]4Pb3l,o, [(H sN h C S C ^ C ö H tC ^ S Q N H jh k sP b ls, [C6H5C6H4CH2S-C(NH2)2]PbI3, [C,oH7CH2SC(NH2)2]Pbl3, [CioH yChC^SQNHzhlPbL, [C^HyOjCHzSC-(NH2)2]PbI3, [C,4H9CH2SC(NH2)2]Pbl3, and [C M H gO ^SQ N H z^hPbB ^ were prepared and characterized analytically and spectroscopically. 
  Reference    (Z. Naturforsch. 56b, 57—61 [2001]; received September 11 2000) 
  Published    2001 
  Keywords    Organic-Inorganic Hybrids, Low-Dimensional Semiconductors, Fluorescence 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0057.pdf 
 Identifier    ZNB-2001-56b-0057 
 Volume    56 
6Author    Walter FabianRequires cookie*
 Title    W. Fabian * Eigenschaften von Molekülen in angeregten Zuständen 348 Properties of Molecules in Excited States  
 Abstract    Using bisisochinolin derivatives and related compounds it is shown that information about the fluorescent state can be obtained by comparison of experimental fluorescence data and calculated energies of the Si-state assuming various geometries. 
  Reference    Z. Naturforsch. 33b, 332—335 (1978); eingegangen am 7. September 1977 
  Published    1978 
  Keywords    Excited States, Fluorescence, PPP-Calculations, Phototautomerism, Bisisochinolin Deri-vatives 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0332.pdf 
 Identifier    ZNB-1978-33b-0332 
 Volume    33