Salerno, Elvin V. et al. published new experimental results with the assistance of cas: 89-73-6

Recommanded Product: N,2-DihydroxybenzamideIn 2020, Salerno, Elvin V.;Eliseeva, Svetlana V.;Schneider, Bernadette L.;Kampf, Jeff W.;Petoud, Stephane;Pecoraro, Vincent L. published 《Visible, Near-Infrared, and Dual-Range Luminescence Spanning the 4f Series Sensitized by a Gallium(III)/Lanthanide(III) Metallacrown Structure》. 《Journal of Physical Chemistry A》published the findings. The article contains the following contents:

Ga³⁺/Ln³⁺ metallacrowns (MCs) [LnGa₈(shi)₈(OH)₄]Na·xMeOH·yH₂O (Ln-1, Ln = Pr³⁺, Nd³⁺, Sm³⁺-Yb³⁺ and analog Y³⁺; H₃shi = salicylhydroxamic acid) is presented. Ln-1 were obtained by reacting Ga³⁺ and Ln³⁺ nitrate salts with the H₃shi ligand. X-ray single crystal unit cell anal. confirmed that all MCs are isostructural. The crystal structure was solved for the Nd³⁺ analog and revealed that Nd³⁺ is centered between 2 [12-MC_Ga^III_N(shi)-4] MC rings and bound to 8 hydroximate O ions (4 from each ring) in a pseudosquare antiprismatic fashion adopting a pseudo-D_4h symmetry. Pulsed gradient spin echo diffusion ordered ¹H NMR spectroscopy and electrospray ionization mass spectrometry confirmed that the structure of Ln-1 remains intact in MeOH solutions while mass spectrometry suggests that 4 OH^– bridges are exchanged with MeO^–/CD₃O^–. An exceptional ability of this series of MCs to sensitize the characteristic emission of Ln³⁺ was confirmed with the observation of bright red and green emission signals of Eu-1 and Tb-1, NIR emissions of Yb-1 and Nd-1, and dual-range emissions of Pr-1, Sm-1, Dy-1, Ho-1, Er-1, and Tm-1 in the solid state upon excitation into ligand-centered bands at 340 nm. The luminescence properties of Ln-1 (Ln = Nd³⁺, Sm³⁺, Eu³⁺, Tb³⁺, Dy³⁺, and Yb³⁺) were also studied in MeOH and CD₃OD solutions For Eu-1 and Yb-1 MCs, more extensive analyses of the photophys. properties were performed, which included the determination of radiative lifetimes, intrinsic quantum yields, and sensitization efficiencies. The absolute quantum yields (Q_Ln^L) of Ln-1 in the visible and NIR ranges were determined In the case of Sm-1, the values of Q_Ln^L in MeOH and CD₃OD solutions are exceptionally high, i.e., 10.1(5) and 83(1)%. Values obtained for Yb-1, i.e., 0.78(4)% in MeOH and 8.4(1)% in CD₃OD, are among the highest ones reported today for Yb³⁺ complexes formed with nondeuterated and nonhalogenated ligands. The experimental procedure involved many compounds, such as N,2-Dihydroxybenzamide (cas: 89-73-6) .

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