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1999 (2)
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1Author    Joachim Heinickea, Attila Dala, Hans-Friedrich Kleinb, Olaf Hetcheb, Ulrich Flörkec, Hans-Jürgen HauptcRequires cookie*
 Title    Formation of r71-P-(2-Phosphinophenol)Ni(0)(PMe3)3 and Oxidation to cjs/fraws-Bis(2-phosphinophenolato)nickel(II) Complexes  
 Abstract    o-Phosphinophenols 1 (P ^ O H) react with equimolar amounts of Ni(PMe3)4 at low tempera­ tures to give yellow Ni(0) complexes such as [(HO~P)Ni(PMe3)3] 2a with only P coordination of the P ^ O H ligand. Oxidation of solutions of 1 and Ni(PMe3)4 by dioxygen leads to brown bis(o-phosphinophenolato-P^O)nickel chelate complexes 3a-d. Structure elucidation by NM R is consistent with a m-square planar geometry for 3a-c and a rrans-square planar solution struc­ ture of the terr-butylphenylphosphino derivative 3d. The geometric isomers were distinguished by different ranges of phosphorus coordination shifts and 3lP-l3C-2 and 3IP-13C-1 coupling 
  Reference    Z. Naturforsch. 54b, 1235—1243 (1999); received May 19 1999 
  Published    1999 
  Keywords    Phosphinophenolate, Nickel, Complexes, Structure Elucidation, Solid State Structures 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1235.pdf 
 Identifier    ZNB-1999-54b-1235 
 Volume    54 
2Author    Silke Buchler, Franc Meyer, Albrecht Jacobi, Peter Kircher, Laszlo ZsolnaiRequires cookie*
 Title    Novel Dinucleating Ligand Systems Containing Two Adjacent Coordination Compartments of the Potential Triamidoamine-Type -Nickel(II) and Cobalt(II) Coordination Chemistry  
 Abstract    The preparation of novel dinucleating pyrazolate ligands H5L3 -H5L8 carrying chelating side arms with appending secondary amine functions is reported. Following different synthetic routes, either CH2CF3, C6H2F3 , or CftF? moieties can be introduced as substituents at the termi­ nal nitrogen atoms. These systems are reminiscent of two coupled coordination compartments of the potential triamidoamine-type. Crystallographic analyses of a series of bimetallic complexes of the CH2CF3-substituted ligand H5L4 with NiCh and C0 CI2 reveal manifold coordination modes in the solid state, resulting from the facile detachment of a single or several N-donor sites from the metal centers. Coordination number sets {4/6} (in H5L4Co2CU) and {5/6} (in H4L4Ni2Cl3, H4L4Co2Cl3 and H5L4Ni2CL) are thus observed. In the non-deprotonated HsL-type systems the remaining protons are found to be scavenged by a pyrazolate-N (in H5L4Ni2CU) or an amine function of a ligand side arm (in H ^ C o iC U). 
  Reference    Z. Naturforsch. 54b, 1295—1306 (1999); received June 18 1999 
  Published    1999 
  Keywords    Dinuclear Complexes, N-Ligands, Nickel, Cobalt, Solid-State Structures 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1295.pdf 
 Identifier    ZNB-1999-54b-1295 
 Volume    54 
3Author    Robert Ruloff, Thomas Gelbrich, Joachim Sieler, Eberhard Hoyer, Lothar BeyerRequires cookie*
 Title    Strukturen zweier isomerer Gadolinium(III)-Polyaminopolycarboxylate -Argumente für signifikante Unterschiede ihrer ^-NM R-Relaxation Structures of Two Isomeric Gadolinium(III) Polyamino Polycarboxylates -Relation to their Significant Differences in 'H NMR Relaxation  
 Abstract    We present preparation and X-ray crystal structures of gadolinium(III) complexes with two isomeric ligands; triethylenetetraminehexaacetic acid, H6ttha, and tris(2-aminoethyl)amine-hexaacetic acid, H6ttaha, respectively. In case of [C(NH2)3]2[Gd(Httha)] • 5 H20 (1) the inner coordination sphere is made up of 9 donor atoms of the ligand and reflects the low efficiency in accelerating 'H NMR relaxation of an aqueous solution. In case of [C(NH2)3]3[Gd(ttaha)] • 3 H20 (2) the coordination number of 9 is realized via 7 donor atoms of the ligand and 2 oxygen atoms of a pending acetate group of the adjacent complex. Luminescence studies in aqueous solution confirm replacement of this acetate group by 2 water molecules. The relaxivity of [Gd(Httaha)]2-is 7.3 ± 0.1 mM ~'s -1 as determined at pH = 7.2, 20 MHz and 40°C. 
  Reference    Z. Naturforsch. 52b, 805—809 (1997); eingegangen am 23. April 1997 
  Published    1997 
  Keywords    Gadolinium(III) Chelates, Solid State Structures, Lanthanoids, 'H NMR Relaxivity, Magnetic Resonance Imaging 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0805.pdf 
 Identifier    ZNB-1997-52b-0805 
 Volume    52 
4Author    Robert Ruloff, Thomas Gelbrich, Eberhard Hoyer, Joachim Sieler, Lothar BeyerRequires cookie*
 Title    Gesteuerte Kristallisation des Gadolinium(III)-Komplexes von Diethylentriaminpentaacetat: Monomere und dimere Struktur Controlled Crystallization of the Gadolinium(III) Complex of Diethylenetriamine- Pentaacetate: Monomeric and Dimeric Structure  
  Reference    Z. Naturforsch. 53b, 955—959 (1998); eingegangen am 29. Mai 1998 
  Published    1998 
  Keywords    Gadolinium(III) Chelates, Diethylenetriamine-Pentaacetate Complexes, Coordinated Water, Solid State Structures, Magnetic Resonance Imaging 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0955.pdf 
 Identifier    ZNB-1998-53b-0955 
 Volume    53 
5Author    Berthold KerstingRequires cookie*
 Title    Nickel Complexes of N-Alkylated Derivatives of 2,6-Bis(aminomethyl)- 4-te/t-butyl-thiophenol  
 Abstract    The syntheses of N-alkylated derivatives of the arenethiol 4-terf-butyl-2,6-(diaminomethyl)-thiophenol and their coordination properties are reported. Compounds 4-terf-butyl-2,6-di(/V-iso-propyl-aminomethyl)thiophenol (3) and 4-terf-butyl-2-(AMsopropyl-aminomethyl)-6-hydroxy-methylthiophenol (6) react with Ni(II) salts to give compounds of composition [Ni(3)2]-2HC1 (7) and [Ni(6)2] (8). The solid-and solution-state structures of both complexes consist of mononuclear complexes with four-coordinate nickel(II) ions in approximately planar trans-N2S2 coordination environments. In contrast to the parent arenethiol 4a, the sterically more encumbered ligands do not form dinuclear complexes. 
  Reference    Z. Naturforsch. 53b, 1379—1385 (1998); received June 26 1998 
  Published    1998 
  Keywords    Mononuclear Complexes, Nickel, Amine-Thiolate Ligands, Solid-State Structures, Solution-State Structures 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1379.pdf 
 Identifier    ZNB-1998-53b-1379 
 Volume    53