Uranyl Sensitization of Samarium(III) Luminescence in a Two-Dimensional Coordination Polymer
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https://figshare.com/articles/dataset/Uranyl_Sensitization_of_Samarium_III_Luminescence_in_a_Two_Dimensional_Coordination_Polymer/2566948
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资源简介：
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.
创建时间：
2016-02-22
