Three unique lanthanide complexes of formula Ln(tdh)3dpp (where Ln = Eu3+, Tb3+or Nd3+; tdh = 1,1,1- trifluoro-5,5-dimethyl-2,4-hexanedione and dpp = 2,3-Bis(2-pyridyl)pyrazine) were structurally characterized. X-ray quality crystals were grown through slow evaporation in a solution of concentrated ethyl acetate and hexanes. Each of the metals are eight coordinate, with 6 oxygen atoms from the tdh ligand and two nitrogen atoms from the dpp. Specifically, the nitrogen from 1-pyridyl group and the 1-pyrazine group coordinate to the lanthanide metal. Luminescent studies were performed on all three compounds. The Eu and Tb complexes were able to emit light in the visible region of the spectrum when the solutions are excited at 288 nm, which causes the π-π* transition to occur in the tdh ligand. Emission lines corresponding to transitions from the 5D0 and 5D4 state to the 7FJ manifold of the Eu(III) and Tb(III), respectively, are observed. The intensity of these emissions increases as the temperature is decreased.
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Chemistry | Physical Sciences and Mathematics
Grewal, Jasminder S., "Synthesis and Characterization of Three Unique Mono-Metallic Lanthanide Complexes" (2014). Honors Theses. 22.