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1994 (1)
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1Author    Anastassios Zografidis, Kurt Polborn, Wolfgang Beck, BertusA. Markies, G. Erard, Van KotenRequires cookie*
 Title    Insertion of Isocyanides into the Palladium-Carbon Bond of Cyclopalladated Complexes  
 Abstract    Insertion of isocyanides into the P d -C bond has been observed in the reactions of PdBr[C6H3(CH2NMe2)2-2,6] with isocyanides CNR which give the complexes 
  Reference    Z. Naturforsch. 49b, 1494—1498 (1994); received June 27 1994 
  Published    1994 
  Keywords    Palladium Complexes, Isocyanide, Cyclopalladation, Insertion 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1494.pdf 
 Identifier    ZNB-1994-49b-1494 
 Volume    49 
2Author    Karl-Friedrich Tebbe, Bernhard FreckmannRequires cookie*
 Title    Untersuchungen an Polyhalogeniden, V [1]  
 Abstract    Darstellung und Kristallstruktur des Tetrammin-palladium(II)-oktaiodids, [Pd(NH3)4]I8 Studies on the Polyhalides, V [1] Preparation and Crystal Structure of [Pd(NH3)4]l8 The new compound [Pd(NH3)4]l8 crystallizes monoclinically in the space group P2i/m with a = 959.0 pm, b = 835.4 pm, c = 1301.1 pm, ß = 103.37° and Z = 2 formula units. The crystal structure has been solved by 'direct methods' and refined to R = 0.057 with 1357 observed reflections. The structure consists of quadratically coordinated cations [Pd(NH3)4] 2+ and planar, Z-shaped and completely ordered octaiodide anions I8 2 ~. According to the sequence of interatomic distances d(I-I) = 295.0 pm, 289.9 pm, 336.2 pm, 279.1 pm, 327.0 pm, 339.3 pm, 273.8 pm the anions may be described as [I3- • I2 • (I~ • I2)]-The iodide-iodine sides (I- • I2) are joined with the distance d(I---I) = 364.1 pm to a slightly bent triiodide chain being part of an octaiodide ribbon ^ [Is 2-]-Next contact spacings between neigh-boring anions start at d(I---I) = 403.7 pm. 
  Reference    Z. Naturforsch. 37b, 542—549 (1982); eingegangen am 26. November 1981 
  Published    1982 
  Keywords    Palladium Complex, Polyhalide, Octaiodide Ion, Iodine Chain, Crystal Structure 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0542.pdf 
 Identifier    ZNB-1982-37b-0542 
 Volume    37 
3Author    Rongnong Zhou, KurtE. GeckeierRequires cookie*
 Title    Complexation of Poly(ethyleneimine)-Bound 8-Hydroxyquinoline with Palladium(II)  
 Abstract    The com plexing behavior o f poly(ethyleneimine) 5-sulfonyl-8-hydroxyquinoline (POX) with palladium(II) ions in aqueous solution was studied by m eans o f spectrophotom etry in the visible region. It was shown that poly(ethyleneimine) 5-sulfonyl-8-hydroxyquinoline forms a stable, water-soluble, orange-colored complex which has a maximum absorption at a w ave­ length o f 424 nm. The effect o f pH, concentration o f poly(ethyleneimine) 5-sulfonyl-8-hydroxyquinoline, concentration o f palladium(II) ions, and time were investigated. The re­ sults show that in a pH range between 2 and 5, the absorbance is constant for 40 minutes. The linear concentration range for palladium(II) ions was determined to be 0 -2 .5 //g -m l-1 and the molar extinction coefficients 1 .0 6 -104 (l-m o l-1 -cm -1) for the polymeric derivative and 7 .1 5 -103 for the monomeric 8-hydroxyquinoline. The effect o f tartaric acid as a masking agent was examined in order to eliminate the influence from other ions. The simultaneous presence o f K(I), Cs(I), Li(I), Ba(II), Ca(II), Cd(II), Hg(II), M n(II), N i(II), A l(III), As(III), Au(III), Cr(III), Fe(III), Pt(IV), As(V) did not interfere with the com plexation o f poly(ethyleneimine) 5-sulfonyl-8-hydroxyquinoline and palladium(II). However, it was found that N H 4+ interferes strongly. The polymer 8-hydroxyquinoline derivative exhibited a 45% higher sensitivity to Pd(II) ions in comparison to the low-molecular-weight 8-hydroxyquinoline. 
  Reference    Z. Naturforsch. 47b, 1300—1306 (1992); received April 28 1992 
  Published    1992 
  Keywords    C om plexation, 8-Hydroxyquinoline, Polymer-Bound, Oxine, Palladium Complex 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1300.pdf 
 Identifier    ZNB-1992-47b-1300 
 Volume    47 
4Author    Michael Zettlitzer, Heindirk Tom Dieck, Lutz StampRequires cookie*
 Title    Reactions of N-Silated Endiamines, I Transition Metal Complexes of l,3-Diaza-2-sila-4-cyclopentenes  
 Abstract    1,3-Diaza-2-sila-4-cyclopentenes 1 (D ISC), which are electron-rich and easily oxidizable ole­ fins, form strongly coloured, but poorly soluble 1:1 adducts with cuprous halides, while silver trifluoromethylsulfonate oxidizes 1. Much more soluble and again strongly coloured complexes of stoichiometry LPdX2, (L)15PdX2 and L 2PdX2 are formed from 1 and palladium halides. The well-crystallizing adduct (PdCl-,-L)o 3a was chosen for an X-ray structure analysis (monoclinic, space group P 21c; a = 10.215(3), b = 14.681(3), c -23.642(5) A , ß = 101.31(2)°; Z = 8 ; R = 0.054), which revealed an almost planar D ISC ligand in an oblique ?z2(C=C)-coordination relative to the 7r-plane. Structural data and rather peculiar spectroscopic properties encourage a comparison of 3a with complexes, in which an electron-rich olefin is split to give a bis(carbene) ligand system. The electronic reasons for the splitting of electron-rich olefins at d8 metals are discussed under symmetry considerations. 
  Reference    Z. Naturforsch. 41b, 1230—1238 (1986); eingegangen am 12. Februar/9. Juni 1986 
  Published    1986 
  Keywords    Endiamines, Palladium Complexes, X-Ray, Electron-Rich Olefins, Carbene-Type Complexes 
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 TEI-XML for    default:Reihe_B/41/ZNB-1986-41b-1230.pdf 
 Identifier    ZNB-1986-41b-1230 
 Volume    41