Nicholas AD, Arteaga A, Ducati L, Buck E, Autschbach J, Surbella RG. Insight into the Structural and Emissive Behavior of a 3-Dimensional Americium(III) Formate Coordination Polymer.
Chemistry 2023:e202300077. [PMID:
36973189 DOI:
10.1002/chem.202300077]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 03/24/2023] [Accepted: 03/27/2023] [Indexed: 03/29/2023]
Abstract
We report the structural, vibrational, and optical properties of americium formate (Am(CHO2)3) crystals synthesized via the in situ hydrolysis of dimethylformamide (DMF). The coordination polymer features Am3+ ions linked by formate ligands into a 3-dimensional network that is isomorphous to several lanthanide analogs, (e.g. Eu3+, Nd3+, Tb3+). Structure determination revealed a nine-coordinate Am3+ metal center that features a unique local C3v symmetry. The metal-ligand bonding interactions were investigated using infrared spectroscopy measurements, natural localized molecular orbital calculations, and the quantum theory of atoms in molecules. The results all paint a dominantly ionic bond picture and suggest the metal-oxygen bonds increase in strength from Nd-O < Eu-O < Am-O. The optical properties were probed using diffuse reflectance and photoluminescence spectroscopies. Notably, the rarely reported 5D1' → 7F1' emission band is observed and dominates the emission spectrum. This behavior is unusual and is attributed to the C3v coordination environment of the metal center.
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