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.

Comments

©2011 American Chemical Society

Additional Comments

US Department of Energy award #: DE-SC0001089; NSF grant #s: NSF-CHE 0936982, NSF-CHE0733458, DMR-0348982, DMR-0419754

ORCID ID

0000-0003-0891-7246

DOI

10.1021/ic201450e

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