A series of new polynuclear lanthanide(III) clusters prepared in alkylol amine

Yang, Lili; Zhou, Jian; Zou, Hua‐Hong; Hu, Feilong; Zhao, Junwei

doi:10.1016/j.ica.2019.119201

Cited by 6 publications

(3 citation statements)

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“…Polynuclear Ln 3+ clusters attract increasing attention, as a result of their intriguing geometrical features and interesting properties related to magnetic, quantum computing and luminescent applications. The reported Ln 3+ clusters mainly include trinuclear (Ln 3 , Ln = Gd, Tb, Dy, Ho), [16,17] tetranuclear (Ln 4 , Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb), [18][19][20][21][22][23][24][25][26][27] pentanuclear (Ln 5 , Ln = Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb), [25] hexanuclear (Ln 6 , Ln = Pr, Ce, Eu, Gd, Tb, Dy, Er and Y), [27][28][29][30] octagon (Ln 8 , Ln = Gd, Tb, Dy, Ho), [31] nine-nuclear (Ln 9 , Ln = Nd, Sm, Eu, Gd, Tb, Dy, Ho), [32][33][34] eleven-nuclear (Ln 11 , Ln = Gd, Tb, Dy), [35] dodecanuclear (Ln 12 , Ln = Eu, Gd, Tb, Dy), [32,[36][37][38] hexadecanuclear (Ln 16 , Ln = Gd, Dy) clusters. [39] The number of Ln nuclei in Ln 3+ clusters was often controlled by the preferred coordination geometry of ligands [32] and the reaction environments.…”

Section: Cluster Chemistry Of Group 3 and 4 Metalsmentioning

confidence: 99%

Metal–Organic Frameworks Based on Group 3 and 4 Metals

et al. 2020

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Metal-organic frameworks (MOFs), a class of porous crystalline framework materials, are linked by strong bonds between inorganic and organic building blocks. [1-3] In the past two decades, MOFs have rapidly grown as a star material due to their exceptional performance in areas such as storage, separation and catalysis. [4] The outstanding performance of MOFs in applications benefits from their intrinsically porous structures and highly tunable pore environment. [5-7] The creation and modification of pore space with optimized size, functionality and diversity can be precisely tuned at the molecular level by rationally designing building blocks and synthetic procedures. [8,9] The diversity of MOFs can be enriched by expanding the library of organic linkers with varying lengths, geometries, and functional groups. [10] Additionally, very diverse metal cations are applied to MOF synthesis, ranging from monovalent (Ag + , Cu + , etc.), divalent (Mg 2+ , Fe 2+ , Co 2+ , Ni 2+ , etc.), trivalent (Al 3+ , Sc 3+ , V 3+ , Cr 3+ , etc.), to tetravalent (Ti 4+ , Zr 4+ , Hf 4+ , etc.) cations. [11] In this review, we mainly focus on MOFs with group 3 and 4 metals, including Y, lanthanides (Ln, from La to Lu), actinides (An, from Ac to Lr), Ti, and Zr (Figure 1). Group 3 metal cations are generally found in the oxidation state of +3 in the MOF structures, while group 4 metal cations mainly exist in the oxidation state of +4, leading to the formation of much stronger coordination bonds with carboxylates. [12] Therefore, group 4 metal-based MOFs (M IV-MOFs) generally have enhanced stability compared with MOFs constructed from metals of group 3 and other groups. This series of MOFs stands out because the involved metals can generally coordinate with carboxylates to form frameworks with strong coordination bonds, according to the Pearson's hard/soft acid/base principle, where group 3 and 4 metal cations are regarded as hard acids while carboxylate ligands are hard bases. [11] One remarkable feature of MOFs with group 3 and 4 metals is that they generally can form phases containing M 6 O 8 (M = Y, Ln, An, Zr and Hf) clusters, regardless of their atomic numbers, charges and radius. This series of M 6-based MOFs is best represented by UiO series such as UiO-66 with fcu topology. [13] Under different synthetic conditions, UiO-66(M, M = An, Zr and Hf) constructed from [M 6 (μ 3-O) 4 (μ 3-OH) 4 ] clusters and linear carboxylates can be obtained, while UiO-66(M, M = Y, Ln) is assembled from Metal-organic frameworks (MOFs) based on group 3 and 4 metals are considered as the most promising MOFs for varying practical applications including water adsorption, carbon conversion, and biomedical applications. The relatively strong coordination bonds and versatile coordination modes within these MOFs endow the framework with high chemical stability, diverse structures and topologies, and interesting properties and functions. Herein, the significant progress made on this series of MOFs since 2018 is summarized and an update on the current status an...

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Section: Cluster Chemistry Of Group 3 and 4 Metalsmentioning

confidence: 99%

Metal–Organic Frameworks Based on Group 3 and 4 Metals

et al. 2020

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“…32 Take AlOC-195-Eu for example, the larger intensity of the hypersensitive 5 D 0 -7 F 2 transition is stronger than that of the 5 D 0 -7 F 1 transition identified as a magnetic dipole transition, indicating that the Eu 3+ ions are situated at low symmetry which is in agreement with single-crystal X-ray analysis. 33,34 In conclusion, we have successfully developed a method for assembling multi-level structures based on pre-designed Al 4 Ln 4 heterobimetallic rings using flexibly coordinated formic acid ligands. In addition, the fluorescence properties of the heterobi-metal molecular rings and their multi-level structures have been studied.…”

mentioning

confidence: 99%

“…32 Take AlOC-195-Eu for example, the larger intensity of the hypersensitive 5 D 0 → 7 F 2 transition is stronger than that of the 5 D 0 → 7 F 1 transition identified as a magnetic dipole transition, indicating that the Eu 3+ ions are situated at low symmetry which is in agreement with single-crystal X-ray analysis. 33,34…”

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confidence: 99%