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'Mixed Ligand Complexes' in keywords
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1Author    K. Irmer, W. PreetzRequires cookie*
 Title    Normalkoordinatenanalyse an Oktaederkomplexen des  
 Abstract    Typs [MXW Y6_ J z", M = Ru, Rh, Os, Ir, Pt; X # Y = F, Cl, Br; n = 0 -6 ; z = 1 -3 Normal Coordinate Analysis on Octahedral Complexes of the Type [MX"Y6_ " r , M = Ru, Rh. Os, Ir, Pt; X # Y = F, Cl, Br; n = 0 -6 ; z = 1 -3 Normal coordinate analyses for all com pounds o f the series [MX"Y6_Jr~, M = Ru, Rh. Os, Ir, Pt; X Y = F, Cl, Br; n = 0 -6 ; z = 1 -3 , including the geometric isomers for n = 2, 3, 4 have been performed, based on a general valence force field. For the isostructural species o f the point symmetries Oh (n -0, 6), D 4h (2, 4, trans), C4v (1, 5), C3v (3,fac), C2v (2, 4, cis\ 3, mer) sequences o f decreasing frequencies are established. Due to the different trans influences X < Y (F < Cl < Br) in asymmetric axes X ' -M -Y ' , the M -Y ' bonds are strengthened and the M -X ' bonds are weakened, as indicated by valence force constants for M -Y' up to 21 % high­ er (P t-C l'), for M -X ' down to 18% lower (P t-F '), as compared with the values calculated for symmetrical X -M -X and Y -M -Y axes, respectively. The influence o f the different central ions and their oxidation numbers on the force field is discussed. 
  Reference    Z. Naturforsch. 46b, 1200—1206 (1991); eingegangen am 12. April 1991 
  Published    1991 
  Keywords    Normal Coordinate Analysis, Force Constants, /rans-Influence, Mixed-Ligand Complexes 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1200.pdf 
 Identifier    ZNB-1991-46b-1200 
 Volume    46 
2Author    Andreas Voigt3, Ulrich Abramb, Reinhard Kirmse3Requires cookie*
 Title    Zur Existenz von [ReNCl4.nF,|]' (n = 1-3) Nitridorhenat(VI)-Gemischt- ligandkomplexen -Eine EPR-Untersuchung EPR Evidence of [ReNCl4_ "F J~ (n = 1-3) Nitridorhenate(VI) Mixed-Ligand Complexes  
 Abstract    The formation of mixed-ligand complexes of the type [RevlNCl4_"Fn]_ (n = 1 -3) during the reaction of [ReVINCl4]~ with [ra-(C4H9)4N]F, KF, and HF is reported. Evidence of the individual mixed-ligand compounds is given by their EPR spectral data. In frozen solutions a specific dependence of the EPR data on the composition of the coordination sphere could be detected. This is shown (i) by a nearly linear dependence of gy and A| Re on the Cl/F-content of the [ReVINCl4_"F"]-unit (additivity rules) and (ii) by well-resolved l9F hyperfine splittings. 
  Reference    Z. Naturforsch. 53b, 1183—1187 (1998); eingegangen am 9. Juni 1998 
  Published    1998 
  Keywords    Rhenium Complexes, Nitrido Complexes, Mixed-Ligand Complexes, EPR Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1183.pdf 
 Identifier    ZNB-1998-53b-1183 
 Volume    53 
3Author    Etelka Farkas, BedaE. Fischer, Rolf Griesser, VolkerM. Rheinberger, Helmut SigelRequires cookie*
 Title    Ternary Complexes in Solution, XXX [1] Increased Stability Through Intramolecular Stacking in Mixed-Ligand Cu 2+ and Zn 2+ Complexes of 2,2' -Bipyridyl and Carboxymethyl Aryl Derivatives  
 Abstract    The stability constants of ternary Cu 2+ and Zn 2+ complexes, each of which contains 2,2'-bipyridyl and a carboxymethyl aryl sulfide, were determined in 50% aqueous dioxane. A comparison of the stability of these ternary complexes with those formed with simple carboxylates demonstrates an enhanced stability of the carboxymethyl aryl sulfide containing mixed ligand complexes. This enhanced stability is not due to a thioether-metal ion interaction, but due to an intramolecular aromatic stacking interaction between the aryl moiety of the carboxymethyl aryl sulfide and 2,2'-bipyridyl. Indeed, by UV difference spectra and by PMR measurements it is possible to show that a binary (metal ion-free) stacked adduct between the aromatic moieties of the two mentioned ligands is formed. Furthermore, by studying the binary and ternary systems of Zn 2+ or Cu 2+ , 2,2'-bipyridyl and hydrocinnamate, i.e. 3-phenylpropionate (-S-of carboxymethyl phenyl sulfide is replaced by -CH2-), it becomes obvious that the thioether moiety is not essential for the observation of an enhanced stability of the ternary complexes. PMR shift studies of 2,2'-bipyridyl/Zn 2+ /carboxymethyl aryl sulfide systems confirm the presence of stacking in the corresponding ternary complexes. Depending on the kind of the ternary metal ion complex the stability enhancement, due to the intramolecular stacking between the aro-matic parts of the coordinated ligands, is between about 0.2 to 0.5 log unit. 
  Reference    Z. Naturforsch. 34b, 208—216 (1979); received September 1 1978 
  Published    1979 
  Keywords    Mixed-Ligand Complexes, Stacking Interactions, 2, 2'-Bipyridyl, 3-Phenylpropionate, Carboxymethyl Aryl Sulfides 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0208.pdf 
 Identifier    ZNB-1979-34b-0208 
 Volume    34 
4Author    Hide Kambayashia, Junko Yuzurihara3, Yuichi Masuda3, Hiroko Nakagawab, Wolfgang Linertc, Yutaka FukudaadRequires cookie*
 Title    4-and 5-Coordinate Dinuclear Copper(II) Complexes with the Tetraacetylethanediide and an N-Alkylated Diamine or a Triamine  
 Abstract    Six dinuclear copper(II) complexes have been prepared, Cu2(taet)(plam)2X 2 where taet = 1,1,2,2-tetraacetylethanediide, plam = N-alkylated polyamine such as tmen = N,N,N',N'-tetra-methylethylenediamine or pmdt = N,N,N',N",N"-pentamethyldiethylenetriamine, X = a monovalent anion such as C104-, N 0 3-or C L. These complexes are classified into two categories from the results of electronic spectra, IR spectra, and X-ray single crystal structure analysis as follows: (1) 4-coordinate-4-coordinate dinuclear, [Cu2(taet)(tmen)2]X 2 (where X = C104~ or N 0 3-), (2) 5-coordinate-5-coordinate dinuclear, [Cu2(taet)(tmen)2Cl2], and [Cu2(taet)(pmdt)2]X 2 (where X = C104~, N 0 3-, or Cl-). The crystal structure of Cu2(taet)(tmen)2(C104)2-H20 (1) has been determined by the single crystal X-ray diffraction technique; monoclinic space group P2Ja with a = 26.478(3), b = 8.744(1), c = 15.601(3) Ä, ß = 106.195(9)°, and V = 3468.9(8) Ä 3 for Z = 4. The final agreement factors are R = 0.097 (Rw = 0.099). The geometry of each Cu(II) moiety in the dinuclear cation (1) is 4-coordinate square planar with a N 20 2 donor set. This tmen-dinuclear complex exhibits a very weak C u (II)-C u (II) interaction (J = -0.5 cm-1), and shows characteristic ESR spectra with seven hyperfine peaks in 1,2-dichloroethane solution at room temperature. This is not found for the corresponding pmdt-dinuclear complex. All complexes obtained in this study are very soluble in many organic solvents. The tmen-dinuclear complexes show pronounced solvato-chromic behavior-dependent on the solvent donor properties. This is not found for the corre­ sponding pmdt-dinuclears, which are stable as 5-coordinated species. 
  Reference    Z. Naturforsch. 50b, 536—544 (1995); received October 12 1994 
  Published    1995 
  Keywords    Dinuclear Cu(II) Complexes, 5-Coordinate Complexes, Chromotropism, Mixed Ligand Complexes, Anion Coordination 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0536.pdf 
 Identifier    ZNB-1995-50b-0536 
 Volume    50