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'Fluxionality' in keywords
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1998 (1)
1987 (1)
1978 (1)
1Author    Bernd Jakob, Dirk ReinenRequires cookie*
 Title    The Temperature-Variable Geometry of the Pseudo-Octahedral Cu06 Entity in Bis(methoxyacetato)diaquo-Copper(II) -a Single Crystal EPR Study  
 Abstract    The Cu —O bond lengths in the pseudooctahedral bis(methoxyacetato)diaquo-copper(II) com­ plex are determined by the Jahn-Teller effect on the one hand and by the bonding properties of the three different oxygen ligator atoms (from a carboxylate. water and ether group) on the other. It is derived from E PR single crystal and powder investigations between 4.2 and 350 K, that the system becomes fluxional above —120 K due to a continuous transition from a static to a (par­ tially) dynamic Jahn-Teller distortion. A model is presented, which allows to correlate the EPR results with the C u —O spacings, if they are calibrated with structural data at two different temperatures. The structure of the ground state potential surface of Cu2+ is derived from the spectroscopic data. 
  Reference    Z. Naturforsch. 42b, 1500—1506 (1987); received June 25 1987 
  Published    1987 
  Keywords    Jahn-Teller Effect, Fluxionality, E PR Spectra Copper(II) Complex 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-1500.pdf 
 Identifier    ZNB-1987-42b-1500 
 Volume    42 
2Author    Hans-Friedrich Klein, Alexandra Brand, Gerhard CordierRequires cookie*
 Title    Synthesis and Reactions with CO and C2H4 of Cobalt(I) Complexes Containing Trimethylphosphine and Chelating o-Diphenylphosphanyl- phenolate Ligands  
 Abstract    In tetracoordinate cobalt(I) halide compounds CoX(Ph2P ^ O H)(P M e3)2 (X = CI, Br) o-phos-phanylphenols PhaP^O H are coordinated as phosphane ligands. In the presence o f base chelat­ ing anions Ph2P ^ O _ give rise to pentacoordinate com plexes Co(Ph2 P ^ O)(P M e3)3. M olec­ ular structures are presented for both types o f compounds. The five-membered chelate ring in Co(Ph2P ^ O)(P M e3)3 is resistant to protonation, and ring-opening is not observed in the presence o f CO or C2H4. Replacing one o f the trimethylphosphanes by one o f the 7r-acceptor ligands affords fiuxional com plex m olecules which upon cooling attain definite ground-state geometries out o f a multitude o f possible isomers. 
  Reference    Z. Naturforsch. 53b, 307 (1998); received November 28 1997 
  Published    1998 
  Keywords    Cobalt, o-Phosphanylphenolate Complexes, Synthesis, Structure, Fluxionality 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0307.pdf 
 Identifier    ZNB-1998-53b-0307 
 Volume    53 
3Author    Peter HofmannRequires cookie*
 Title    Das Tricarbonyl-eisen-cycloheptatrienid-Anion [C7H7Fe(CO)3] : r/ 3 -Allylanion-oder ^ 4 -Butadienkomplex ? The Triearbonyl Iron Cyeloheptatrienide Anion: r/ 3 -Allyl Anion or ^-Butadiene Complex ?  
 Abstract    Molecular orbital calculations for [C7H7Fe(CO)3]-predict a ^ 3 -allyl anion Fe(CO)3 com-plex with un-coordinated diene part of the C7H7 ligand to be more stable than the alter-native 7j 4 -butadiene Fe(CO)3 form, the cyclopolyenyl ligand being nonplanar in either case. The tiny energy difference between both coordination modes accounts for the observed high fluxionality of the anion. 
  Reference    Z. Naturforsch. 33b, 251—260 (1978); eingegangen am 19. Dezember 1977 
  Published    1978 
  Keywords    Triearbonyl Iron Cyeloheptatrienide, Fluxionality, Ground State Structure, Molecular Orbital Calculations 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0251.pdf 
 Identifier    ZNB-1978-33b-0251 
 Volume    33