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Stability constants are measured for complexes of Fe(II), Co(II), Ni(II), Cu(II) and Zn(II) with some 5-substituted-1,10-phenanthrolines, and are tabulated with other constants reported in the literature. It is found that the order of stabilities for the 1:1 complexes follows the expected series: Fe(II) < Co(II) < Ni(II) < Cu(II) > Zn(II). The 1:3 complexes follow an anomalous order which is attributed to non-uniformity in the metal ions with respect to the symmetry of the octahedral configuration. An important implication in this interpretation is that, the iraBS-configuration of bis-(l,10phenanthroline)-copper(II) is sterically unstable.

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