(Journal Article) Tigaa, Rodney A. creator Kuehn, Stephen | Monteiro, Jorge H. S. K. | Akhmedov, Novruz G. | Jiang, Changle | Kidd, Faith E. | Barton, Joseph D. | Rose, Ciersten S. Franklin, Katherine Y. | Herron, Sheridan F. | Hatfield, Franki N. | Baisden, Kaleigh G. | Ramsay, Abagale K. | Appiah, Samuel K. text Washington DC : American Chemical Society , 2023 monographic eng

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3584–3594p. Abstract: The chemistry of 4d and 4f metals was investigated at the undergraduate level in an effort to incorporate f-element chemistry in the curriculum. This was accomplished through microwave-assisted synthesis of 1,10-phenanthroline (phen) coordination compounds [Eu(phen)3](PF6)3 and [Ru(phen)3](PF6)2, and embedding the coordination compounds in polystyrene (PS) beads. Through a combination of 1-D/2-D spectroscopic techniques, the metal-phen coordination compounds in solution and in the solid state were probed. It was validated that the strong interaction between the phen ligand and Ru2+ is due to the diffuse nature of the 4d orbitals. The interaction resulted in a low energy MLCT band, which provides opportunities for excitation at lower energies using 4d metals. In contrast, the phen ligand and core Eu3+ 4f orbitals exhibited a weak interaction. This was supported by variable-temperature NMR (VT-NMR) measurements, which revealed relatively well-separated proton resonances with minimal differences in chemical shifts for the phen ligand at 25 °C and the [Eu(phen)3](PF6)3 compound at −42 °C, indicating a weak Eu–N interaction. The weak interaction resulted in the formation of an aqua-containing complex in solution evidenced by emission lifetime measurements. Despite the weak interaction, selective excitation (via ligand π–π* versus direct f–f) of the Eu3+ compound allowed for color tuning, leading to the generation of a cool white light. Electron probe microanalysis (EPMA) of the metal-embedded PS beads indicated relatively monodispersed distribution of the metal complexes in the polymer. ***______{For Hard Copy, Please visit Library.}________*** Upper-Division Undergraduate| Biochemistry| Laboratory Instruction| Hands-On Learning/Manipulatives| Inquiry-Based/Discovery Learning| Drugs/Pharmaceuticals| Nucleic Acids/DNA/RNA 0021-9584 https://doi.org/10.1021/acs.jchemed.3c00332 https://doi.org/10.1021/acs.jchemed.3c00332 240116 20240116154647.0