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Kinetics of Ligand Exchange in a Europium Complex

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Abstract

WE have previously reported1 the synthesis of 4,4′-di-n-butyl-2,2′-bipyridyl (L) and its complexes with lanthanide nitrates. We now find that the complex [Eu(NO3)3L2] in chloroform solution undergoes fairly rapid exchange with added free ligand The reaction rate is independent of the concentration of added ligand and this is in accord with a dissociative mechanism The thermodynamic parameters of activation are as follows: ΔG‡ = + 15.0 kcal/mole; ΔH‡ = + 6.4 kcal/mole; ΔS‡= −28.9 cal/deg/mole and K1 = 58 sec−1 at 25°.

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References

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Authors and Affiliations

  1. Chemistry Department, Queen Mary College, University of London,

    F. A. HART, J. E. NEWBERY & D. SHAW

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  1. F. A. HART
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  2. J. E. NEWBERY
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  3. D. SHAW
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HART, F., NEWBERY, J. & SHAW, D. Kinetics of Ligand Exchange in a Europium Complex. Nature 216, 261–262 (1967). https://doi.org/10.1038/216261a0

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