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'Cobalt' in keywords Facet   Publication Year 1999  [X]
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1999[X]
1Author    Katja Heinze, Gottfried Huttner, Laszlo ZsolnaiRequires cookie*
 Title    Tuning the Energy of the NIR Absorption of Dinuclear Triphos-Cobalt-Complexes  
 Abstract    Dinuclear Co(III) complexes of the type [(triphos)Co(C6X2Z' Z2Z3Z4)Co(triphos)]2+ (Z1 ~4 = O, NR, S; R = H, Me; X = H, Cl, Br, I; 1 -62+) have been prepared and characterized by MS, IR, NMR, cyclovoltammetric and UV/VIS/NIR measurements and by X-ray analyses (12+, 3a2+ and 42+). Their redox behaviour and the energy of their low energy LMCT bands was studied and compared to the properties of the mononuclear complexes [(triphos)Co(C6H4Z 'Z 2)]+ (Z1-2 = O, NH, S). 
  Reference    Z. Naturforsch. 54b, 1147—1154 (1999); received June 2 1999 
  Published    1999 
  Keywords    Dinuclear Complexes, NIR Dyes, Cobalt, Tripodal Ligands, Bridging Ligands 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1147.pdf 
 Identifier    ZNB-1999-54b-1147 
 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