Inorganic Chemistry, Vol.38, No.25, 5906-5909, 1999
Unusually high selectivity of polythiaethers for copper(II) over nickel(II)
The stability constants for the Ni(II) complexes formed with eight macrocyclic tetrathiaethers are found to be smaller than the corresponding Cu(II) complexes in acetonitrile at 25 degrees C. The selectivity ratio for Cu(II) over Ni(II) appears to be at least as large as aqueous solution. This is the largest selectivity ever obtained by any class of chelating agents for Cu(II) over Ni(II).
Keywords:ELECTRON-TRANSFER KINETICS;RING SIZE;MACROCYCLICTETRATHIOETHERS;STABILITY-CONSTANTS;AQUOCOPPER(II) ION;COMPLEX-FORMATION;ETHER COMPLEXES;LIGAND;WATER;ACETONITRILE