Ln₂(OH)₅NO₃·xH₂O (Ln = Y, Gd−Lu): A Novel Family of Anion Exchange Intercalation Hosts

Abstract

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Synthesis and Photoluminescence of Colloidal Solution Containing Layered Rare-earth Hydroxide Nanosheets

“…The rectangular arrangements of spots are consistent with those of pristine LRHs ( Figure 2). 20,21 The estimated lattice parameters of a = 0.75 and 0.73 nm and b = 1.32 and 1.30 nm are also comparable with the in-plane structural parameters of LEuH and LTbH host crystals, respectively. This agreement unambiguously indicates that the intralayer structure of LRHs remains unchanged during the anion-exchange reactions followed by the delamination.…”

“…Recently, a series of layered compounds consisting of pure cationic rare-earth hydroxide layers have been reported by several authors [19][20][21][22][23] and briefly reviewed. 24 This class of compounds, called the layered rare-earth hydroxides (LRHs), is represented by the general formula RE 2 (OH) 5 X·nH 2 O where X is the organic or inorganic interlayer anions.…”

Recent progress in layered rare-earth hydroxide (LRH) and its application in luminescence

“…Ln 2 (OH) 5 (A x ) 1/x ·nH 2 O (m = 1, n = 1-2, and typically n  1.5; termed as the 251-LRH phase) [5][6][7] and Ln 2 (OH) 4 (A x ) 2/x ·nH 2 O (m = 2, n = 0-2; 241-LRH phase) [8,9] are two important groups of the LRHs family. The anions (such as NO 3  , Cl  , and Br  ) in the 251-LRH phase of n  1.5 frequently exist in the interlayer gallery as free ones (not coordinated to the Ln 3+ center) and thus exhibit facile exchange with a wide range of carboxylate and sulfonate anions [10][11][12][13][14][15]. Therefore, the 251-LRHs may potentially be exfoliated into single-layer nanosheets of significantly two-dimensional morphologies for the further construction of various nanostructures, particularly highly transparent functional films.…”

“…This review article summarizes the recent achievements attained in the fascinating field of LRHs, including controlled crystallization, structural and morphological features, anion exchange and exfoliation, and application in phosphors and transparent films. 2 (x = 2), is mainly located in the interlayer space to support the layers, and the loss of coordinated water molecules will result in an abrupt layer contraction [10][11][12][13][14][15]. The hydration number tends to decrease with increasing atomic number for the chloride family (orthorhombic structure) while increase for the nitrate analogue (monoclinic structure) [6,11].…”

Hydrothermal-assisted exfoliation of Y/Tb/Eu ternary layered rare-earth hydroxides into tens of micron-sized unilamellar nanosheets for highly oriented and color-tunable nano-phosphor films

“…Because of the significant morphological anisotropy, the nanosheets tend to orient themselves, with a certain crystallographic direction perpendicular to substrate surface, and thus introduce additional or greatly enhanced functionalities. Delaminating layered compounds into nanosheets attracted much attention, and monolayer nanosheets have been successfully exfoliated from several types of layered inorganic materials, such as layered double hydroxides (LDHs) [7,8] Layered rare-earth hydroxides (LRHs) [13][14][15][16][17][18][19][20][21][22][23][24][25][26], with a general formula of RE2(OH)5(Am-)1/m · nH2O (rare-earth (RE) ions; intercalated (A) anions), are a new group of important anion-type layered materials that may potentially be exfoliated into single or few-layer thick nanosheets for the further construction of various nanostructures, particularly transparent functional films. Due to the unique electronic, optical, magnetic, and catalytic properties of the rare-earth elements, LRHs attracted immediate attentions for controllable synthesis since their emergence, and some efforts have been paid to the thinning of LRHs via exfoliation [22,23,26] and exfoliation-free synthesis [24].…”