Synthesis and Characterization of Terbium(III) Complexes: Can we Manipulate the Emission Signature?
Sciences and Mathematics, College of
Chemistry and Physics, Department of
SURS Faculty Advisor
Dr. Justin Stace
Successful Lewis acid/base reactions of terbium(III) nitrate with 2,2’-bipyrdine (22’bpy), 1,10-phenanthroline (phen), and 2,6-dimethylpyridine (pydm) have yielded products, Tb(22’bpy)2(NO3)3, Tb(phen)2(NO3)3, and [Tb(pydm)3](NO3)3 respectively. The absorption spectra of the complexes are starkly similar to the spectrum of the free ligand, while the emission spectrum of the complex is identical for the free Tb3+ ion, due to the large energetic gap between the ligand’s 2p and the metal’s 4f orbitals. Substitution of a ligand containing a third-row nonmetal strategically placed near the terbium may force interaction between the 3p nonmetal orbital and the 4f orbitals of the metal. Because of the strong terbium-oxygen bond present in [Tb(pydm)3](NO3)3, tris(hydroxymethyl)phosphine (THP) was chosen. Lanthanides do not bond with third-row nonmetals directly. However, THP offers the tantalizing similarity to the binding motif found in [Tb(pydm)3](NO3)3 while also positioning a phosphorous near the metal center. Varying the alcoholic solvent used in syntheses of terbium(III) nitrate with THP yields markedly different products; the analysis of products yielded from differing synthetic schemes will be presented.
Gagnon, Ryan, "Synthesis and Characterization of Terbium(III) Complexes: Can we Manipulate the Emission Signature?" (2023). Science University Research Symposium (SURS). 25.