6192-13-8Relevant articles and documents
Anhydrous neodymium(III) acetate
Torres, Sonia Gomez,Meyer, Gerd
, p. 231 - 233 (2008)
Anhydrous neodymium(III) acetate, Nd(OAc)3 was obtained as light purple single crystals by direct oxidation of neodymium metal with malonic acid in a glass ampoule at 180 °C. It crystallizes with the monoclinic space group P21/a (no. 14) with a = 2201.7(2), b = 1850.0(1), c = 2419.0(3) pm, β = 96.127(8)°, V = 9796.8(1) · 106 · pm3, Z = 40 [Nd(OAc)3], R1 = 0.0430 [I 0 > 2σ(I0)]. Most of the Nd3+ cations are coordinated by nine (or eight) oxygen atoms of acetate ligands which bridge these polyhedra to slightly waved layers which are stacked in the [010] direction.
Energy Migration Up-conversion of Tb3+ in Yb3+ and Nd3+ Codoped Active-Core/Active-Shell Colloidal Nanoparticles
Prorok, Katarzyna,Pawlyta, Miros?awa,Strek, Wies?aw,Bednarkiewicz, Artur
, p. 2295 - 2300 (2016/05/10)
The intentional design of chemical architecture of lanthanide doped luminescent nanoparticles through the proper selection of dopants in core-shell and core-shell-shell structures enables optimization of their optical properties. Such an approach allows one to achieve energy transfer up-conversion (ETU) and energy migration mediated up-conversion (EMU) and green emission from Tb3+ ions with the Yb3+ and Nd3+ sensitizers at 980 and 808 nm photoexcitation, respectively. The [Nd3+ → Yb3+]→ [Yb3+ → Tb3+] EMU phenomenon was significantly enhanced by spatial displacement of the sensitizing Nd3+ ions from the activator Tb3+ ions by intentionally introducing an intermediate Yb3+ sensitizer layer forming a [Nd3+ → Yb3+] → [Yb3+] → [Yb3+ → Tb3+] system. Otherwise Tb3+ emission was considerably quenched by Nd3+ ions even though they were spitted between the core and shell, respectively. Moreover, (Tb3+,Yb3+) → (Tb4+,Yb2+) valence change has been discovered to limit the Tb3+ up-conversion emission. The studies explain how the chemical architecture of the smartly designed active-core @ active-shell luminescent nanoparticles may improve their spectral properties.
Syntheses, structures and photophysical properties of heterotrinuclear Zn2Ln clusters (Ln = Nd, Eu, Tb, Er, Yb)
Xu, Hai-Bing,Zhong, Ye-Teng,Zhang, Wei-Xiong,Chen, Zhong-Ning,Chen, Xiao-Ming
, p. 5676 - 5682 (2010/09/17)
Heterotrinuclear Zn2Ln (Ln = Nd 2, Eu 3, Tb 4, Er 5, Yb 6) clusters [(Znq2)2](μ-CH3COO){Ln(hfac) 2} (q = 8-hydroxylquinolinate, hfac = hexafluoroacetylacetonate) have been synthesized. The Zn2Ln framework is ligated by two q ligands featuring μ-phenoxo and two q ligands featuring μ3-phenoxo coordination modes, and one μ-CH3COO- anions. Since the short intramolecular separations of Zn...Ln (ca. 3.354-3.373 A) allow energy transfer from Znq2-based sensitizers to the Ln III centres through two energy transfer pathways, the lanthanide luminescence is indeed lighted up by excitation of the Znq 2-based chromopores. Photophysical measurements revealed that these Zn2Ln complexes exhibit the so-called dual emission originating from both Znq2-based luminophores and lanthanide emitters. By virtue of the dual luminescence with complementary colours, the Znq2-based cyan emission and EuIII-centred red luminescence are combined to generate a white-light emission in the Zn 2Eu (3) complex.