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The pressure and temperature dependence of the 5 D 0 -> 7 F 0 transition of Eu(III) in complexes with 4-phenylethynyl-2,6-pyridinedicarboxylic acid has been measured at various metal to ligand ratios. The spectra have been fit to a sum of Lorentzian peaks, and the temperature dependence used to determine ΔH for the equilibrium reaction for formation of the tris complex...
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