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1Author    L. Ya, E. W. Baranov, SchlagRequires cookie*
 Title    New Mechanism for Facile Charge Transport in Polypeptides  
 Abstract    An electronic hole migration accross a polypeptide chain is discussed with special reference to new ab initio computational results and to the experimental observations of Weinkauf et al. on the charge photoinjection into the polypeptide backbone. New mechanistic details for this efficient charge transport process are proposed. The process is viewed as a vibronically induced hole hopping between local aminoacid sites driven by large amplitude torsional motions of the floppy backbone. 
  Reference    Z. Naturforsch. 54a, 387—396 (1999); received May 7 1999 
  Published    1999 
  Keywords    Protein, Polypeptide, Charge Transfer, Hopping 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0387.pdf 
 Identifier    ZNA-1999-54a-0387 
 Volume    54 
2Author    D. Tudela, V. Fernandez, J. D. TorneroRequires cookie*
 Title    Reactions of (SCN )2 with SnX4 (X = B r, I) A utönom a, Canto B lan co, Madrid 3 4 , Spain  
 Abstract    Fro m the reaction between (S C N)2 and Snl4 a compound is formed the formula o f which is IS n (N C S)3-I2, in which I2 m olecules form charge-transfer com plexes with thiocyanate groups. IS n (N C S)3 can be isolated from this com pound. Both compounds were characterised by m eans of elem ental analyses and U V -visible, IR and 119Sn M össbauer spectra, and a polym er structure with thiocyanate bridges was deduced. The equilibrium constant was calculated for the reaction: IS n (N C S)3-I2(solid) + CS2^± IS n (N C S)3(so lid)+ I2(solution) K = 2 . 2 ± 0 . 3 x l 0 -3 mol I-1 , and it was found that the two solid com pounds form a single phase. S nBr4 forms an unstable addition com pound with (S C N)2, which decom poses even below 0 °C. 
  Reference    Z. Naturforsch. 39b, 791—794 (1984); received D ecem ber 21 1983 
  Published    1984 
  Keywords    Tin, Thiocyanogen, Iodine, Charge Transfer 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0791.pdf 
 Identifier    ZNB-1984-39b-0791 
 Volume    39 
3Author    J. Heldt, J. R. Heldt, T. Redzimski, H. Diehl, P. SchultzRequires cookie*
 Title    Spectroscopic Studies of Dimethylamino Derivatives of Fluorene  
 Abstract    2-dimethylamino-9-fluorenol and 2-dimethylamino-9(4'dimethylamino)phenyl-9-fiuorenol in polar solvents in the excited state undergo conformation changes in which two fluorescent isomers are created. The isomers (in the local excited (LE) and charge transfer (CT) configuration) pos-sess separate fluorescence bands, one appearing from the S! (LE) state and the second from the intramolecular charge transfer state S, (CT) of the neutral, aromatic molecule. Both bands show a solvatochromic effect. Using the method of the solvent induced Stokes shift of the absorption and fluorescence spectra the permanent dipole moment of the excited state of fluorene and its two derivatives have been determined. The dipole moment of the ground state and the Onsager cavity radius of the studied molecules were calculated with the Auestion Model 1 (AMI) program. 
  Reference    Z. Naturforsch. 55a, 902—908 (2000); received October 31 2000 
  Published    2000 
  Keywords    Isomer, Dual Fluoescence, Solvatochromic Effect, Charge Transfer 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0902.pdf 
 Identifier    ZNA-2000-55a-0902 
 Volume    55 
4Author    Teodor Silviu Balabana ', NinaG. FurmanovabRequires cookie*
 Title    7T-7T Interactions between Pyrylium and Phenyl Rings in the Crystal  
 Abstract    The crystal structures of two isomeric phenyl-substituted pyrylium perchlorates, 2,6-di-methyl-4-phenylpyrylium (1) and 2,4-dim ethyl-6-phenylpyrylium (2), have been determined. Both cations are planar in the crystal so that the electron deficient pyrylium rings can interact strongly with the phenyl rings of adjacent molecules forming stacks along the shortest crys-tallographic axis. The phenyl rings may act as donors in a charge transfer interaction which is more pronounced in 1 than in 2. Charge transfer appears as a non-mandatory consequence of the 7T-7T stacking. The structures demonstrate the electrostatic nature of these interactions conforming to the model of Hunter and Sanders [ 1 ]. 
  Reference    Z. Naturforsch. 52b, 485 (1997); received January 13 1997 
  Published    1997 
  Keywords    Pyrylium Salt, Crystal Engineering, Charge Transfer, Crystal Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0485.pdf 
 Identifier    ZNB-1997-52b-0485 
 Volume    52 
5Author    Horst Kunkely, AmD. VoglerRequires cookie*
 Title    Photoreactivity of Titanocene Pentasulfide  
 Abstract    The electronic spectrum o f Cp2TiSs shows a long-wavelength absorption at Am ax = 492 nm which is assigned to the lowest-energy S52~ ^ T i IV ligand-to-metal charge transfer (L M C T) transition. The photolysis o f the complex in C H 2CI2 leads to the formation o f Cp2T iC l2 and elemental sulfur. It is suggested that L M C T excitation initiates a reductive elimination with the extrusion o f S5 while the reduced titanocene is reoxidized by the solvent. 
  Reference    Z. Naturforsch. 53b, 224—226 (1998); received December 12 1997 
  Published    1998 
  Keywords    Charge Transfer, Titanium Complexes, Sulfide Complexes, Photochemistry 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0224.pdf 
 Identifier    ZNB-1998-53b-0224 
 Volume    53 
6Author    Horst Kunkely, Arad VoglerRequires cookie*
 Title    Photooxidation of Dicyanoaurate(I) Induced by Metal-to-Ligand Charge Transfer Excitation  
 Abstract    The irradiation of [Au(CN)2]_ in oxygen-saturated acetonitrile leads to photooxidation of Au(I). In the presence of additional chloride [AutCN^CL]-is formed with < /> = 0 .5 x 1 0 -4 at Ajrr = 2 5 4 nm. It is assumed that [Au(CN)2]~ in its metal-to-ligand charge transfer state undergoes an excited state electron transfer to oxygen in the primary photochemical step. 
  Reference    Z. Naturforsch. 53b, 853—855 (1998); received April 12 1998 
  Published    1998 
  Keywords    Photochemistry, Charge Transfer, Gold Complexes, Cyanide Complexes 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0853.pdf 
 Identifier    ZNB-1998-53b-0853 
 Volume    53 
7Author    Horst Kunkely, Arnd VoglerRequires cookie*
 Title    Photochemical Reductive Elimination of Nitrogen from Triazidogallium(III). Generation of Luminescent Gallium(I)  
 Abstract    The irradiation of Ga(N3)3 in CH3CN leads to a reductive elimination of nitrogen according to the equation Gam(N3)3 —► Ga*N3 + 3N2 (0 = 0.002 at Ain = 254 nm). Ga+ in CH3CN is characterized by its absorption (Amax = 298 nm) and emission (Amax = 475 nm) spectrum. 
  Reference    Z. Naturforsch. 53b, 1180—1182 (1998); received July 9 1998 
  Published    1998 
  Keywords    Photochemistry, Charge Transfer, Gallium Complexes, Azide Complexes 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1180.pdf 
 Identifier    ZNB-1998-53b-1180 
 Volume    53 
8Author    M. Jánossy, P. MezeiRequires cookie*
 Title    Excitation of the 210 nm Zn II Line in a Hollow Cathode He-Ne-Zn Discharge  
 Abstract    In a hollow cathode He-Zn discharge it was observed that addition of Ne stops laser oscillation at the 492.4 nm Zn II line and increases significantly the spontaneous intensity at the 210 nm Zn II line, which originates from the 4d 2 D 5/2 lower level of the laser transition. Based on a rate equation model, the cross-section of the Ne ion-Zn atom charge transfer collisions populating the 4d 2 D 5/2 level was determined. The cross-section 3.5x 10 -15 cm 2 found by us is in acceptable agreement with the value 2.3x 10" 15 cm 2 reported in the literature. This high cross-section together with existing lower level depopulation points to the possibility of obtaining laser oscillation at 210 nm in a Ne-Zn discharge. 
  Reference    Z. Naturforsch. 53a, 955—959 (1998); received April 6 1998 
  Published    1998 
  Keywords    Gas Lasers, Laser Excitation, Charge Transfer, Glow Discharges, Sputtering 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0955.pdf 
 Identifier    ZNA-1998-53a-0955 
 Volume    53 
9Author    Markus Leirer, Günther Knör, Amd VoglerRequires cookie*
 Title    Synthesis and Spectroscopic Properties of 1,2-Diiminetricarbonyl- rhenium(I)chloride Complexes with Aliphatic Diimines (or 1,4-Diaza-l,3-butadienes) as Ligands  
 Abstract    Re(l,2-diimine)(CO)3Cl complexes with the aliphatic bidentate ligands diiminosuccino-dinitrile (DISN), benzilbisanile (BEAN), bisacetylbisanile (BABA), and benzildiimine (BE­ DIM) are reported. The compounds show Re(I) to 7r*(diimine) metal-to-ligand charge transfer (MLCT) absorptions in the visible spectral region. The energy of these MLCT-transitions de­ creases in the series BABA > BEDIM > BEAN > DISN, depending on the 7r* acceptor properties of the coordinated diimine ligands. The maxima of these CT bands undergo a solvent-dependent shift (negative solvatochromism), which indicates a partial charge redistribution in the excited state. The compounds are not photoluminescent at room temperature and 77 K. 
  Reference    Z. Naturforsch. 54b, 341—344 (1999); received December 11 1998 
  Published    1999 
  Keywords    Charge Transfer, Rhenium Complexes, 1, 4-Diaza-l, 3-butadienes, Solvatochromism 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0341.pdf 
 Identifier    ZNB-1999-54b-0341 
 Volume    54