Chemistry and Physics Faculty Articles
Title
Uranyl Sensitization of Samarium(III) Luminescence in a Two-Dimensional Coordination Polymer
Document Type
Article
Publication Date
1-2-2012
Publication Title
Inorganic Chemistry
ISSN
0020-1669
Volume
51
Issue/No.
1
First Page
201
Last Page
206
Abstract
Heterometallic carboxyphosphonates UO22+/Ln3+ have been prepared from the hydrothermal reaction of uranyl nitrate, lanthanide nitrate (Ln = Sm, Tb, Er, Yb), and phosphonoacetic acid (H3PPA). Compound 1, (UO2)2(PPA)(HPPA)2Sm(H2O)·2H2O (1) adopts a two-dimensional structure in which the UO22+ metal ions bind exclusively to the phosphonate moiety, whereas the Ln3+ ions are coordinated by both phosphonate and carboxylate functionalities. Luminescence studies of 1 show very bright visible and near-IR samarium(III)-centered emission upon direct excitation of the uranyl moiety. The Sm3+ emissive state exhibits a double-exponential decay with lifetimes of 67.2 ± 6.5 and 9.0 ± 1.3 μs as measured at 594 nm, after excitation at both 365 and 420 nm. No emission is observed in the region typical of the uranyl cation, indicating that all energy is either transferred to the Sm3+ center or lost to nonradiative processes. Herein we report the synthesis, crystal structure, and luminescent behavior of 1, as well as those of the isostructural terbium, erbium, and ytterbium analogues.
Additional Comments
US Department of Energy award #: DE-SC0001089; NSF grant #s: NSF-CHE 0936982, NSF-CHE0733458, DMR-0348982, DMR-0419754
NSUWorks Citation
Knope, K. E., de Lill, D. T., Rowland, C. E., Cantos, P. M., de Bettencourt-Dias, A., & Cahill, C. L. (2012). Uranyl Sensitization of Samarium(III) Luminescence in a Two-Dimensional Coordination Polymer. Inorganic Chemistry, 51, (1), 201 - 206. https://doi.org/10.1021/ic201450e. Retrieved from https://nsuworks.nova.edu/cnso_chemphys_facarticles/239
ORCID ID
0000-0003-0891-7246
DOI
10.1021/ic201450e
Comments
©2011 American Chemical Society