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1981 (1)
1Author    Giorgio Anderegg, Wolfgang Kläui, —. Li+, Mg, +. Ca, +. Sr, +. Ba, +. Mn, +. Co, +. Ni, +. Cu, +. Zn, +. Cd, +. Hg, +. Pb, +., Ag+, LaRequires cookie*
 Title    Stability Constants of Metal Ion Complexes of Cyclopentadienyltris(diethylphosphito-P)cobaltate(l-), [(C5H5)CO{P(0)(0C2H 5 ) 2 } 3 ] -, an Oxygen Tripod Ligand  
 Abstract    The formation of metal ion complexes ML(n_1 > + and ML 2 (n_2 >+ of the oxygen tripod ligand L~ = cyclopentadienyltris(diethylphosphito-P)cobaltate(l-) with metal ions M n+ 3+ has been studied by pH titration at 25 °C in 95/5 methanol/water solutions kept at an ionic strength of 0.1 by means of tetramethylammonium chloride. The stabüity of the alkali metal ion complexes increases with decreasing metal ion radii. The sodium complex NaL is more stable than the known crown ether sodium complexes. The Ki values of the transition metal complexes ML+ are «10 9 [1/mol]. For H + , Na+, Mg 2+ , and La 3+ the enthalpies and entropies of complex formation have been determined by calorimetric measurements. The results are comparable to those of the tripolyphosphate anion. The complex formation is slightly endothermic and the stability of the complexes arises from a large positive A S of reaction. 
  Reference    Z. Naturforsch. 36b, 949—951 (1981); eingegangen am 13. Mai 1981 
  Published    1981 
  Keywords    Stabüity Constants, Metal Ion Complexes, Oxygen Tripod Ligand 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0949.pdf 
 Identifier    ZNB-1981-36b-0949 
 Volume    36