Belmont University Research Symposium (BURS)

Publication Date

Spring 2023

College

Sciences and Mathematics, College of

Department

Chemistry and Physics, Department of

BURS Faculty Advisor

Dr. Justin Stace

Presentation Type

Oral Presentation

Abstract

Successful Lewis acid/base reactions of terbium(III) nitrate with 2,2’-bipyrdine (22’bpy), 1,10-phenanthroline (phen), and 2,6-pyridine dimethanol (pydm) have yielded the products: Tb(22’bpy)2(NO3)3, Tb(phen)2(NO3)3, and [Tb(pydm)3](NO3)3, respectively. In accord with the well-known antenna-effect, the absorption spectrum of each complex is similar to the spectrum of the free ligand, while the emission spectrum of the complex is identical for the free terbium(III) ion. In contrast, the 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. Considering the strong terbium-oxygen bond present in [Tb(pydm)3](NO3)3, tris(hydroxymethyl)phosphine (thmp) was chosen; thmp offers the tantalizing similarity to the binding motif found in [Tb(pydm)3](NO3)3 while also positioning a phosphorous near the metal center. Similarly, the phosphate polyatomic anion also suggests itself as a potential ligand particularly because in [Tb(2,6-dimethylpyridine)3](NO3)3 would be retained with the use of phosphate. Synthetic methods and photophysical data of the resulting products will be presented.

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