Abstract
Adduct formation constants have been determined by spectrophotometric study of the heterocyclic base-adducts of the nickel chelates of methyl analogues of 8-quinolinol. Large bathochromic shifts were observed in the visible region on the addition of heterocyclic bases to the organic phase containing Ni-2-methyl-8-quinolinate and hypsochromic shifts were observed in the case of Ni-4-methyl-8-quinolinate, due to adduct formation. Pyridine bases formed diadducts with nickel chelates of 4-methyl-8-quinolinol, whereas monoadducts were observed in the case of 2-methyl-8-quinolinol. This is attributed to the sterically hindering methyl group in 2-methyl-8-quinolinol which maintains a pentacoordinated structure of the pyridine adduct, whereas a more stable hexacoordinated one is favoured by the 4- methyl group in 4-methyl-8-quinolinol. The stabilities of the nickel adducts increase in the following order of the bases: 2-picoline < 2,4-lutidine < 2,4,6-collidine < pyridine < 4-picoline < neocuproin < ethylenediamine < 1,10-phenanthroline < 2,2′- bipyridyl
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