Synthesis and anion exchange chemistry of new intercalation hosts containing lanthanide cations, Ln2(OH)5(NO3)·xH2O (Ln=Y, Gd–Lu)

Abstract

Synthesis and anion exchange chemistry of new intercalation hosts containing lanthanide cations, Ln 2 (OH) 5 (NO 3 ).xH 2 o (Ln =Y, Gd-Lu),

Well-defined crystallites autoclaved from the nitrate/NH4OH reaction system as the precursor for (Y,Eu)2O3 red phosphor: Crystallization mechanism, phase and morphology control, and luminescent property

“…The hexagonal platelets can be indexed to a layered rare-earth hydroxide (LRH) phase of Ln 2 (OH) 5 NO 3 Á 1.56H 2 O ( Fig. 2(a), Ln¼Y and Eu) [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42], where the hydration number was determined via TG analysis up to 260 1C (Fig. S11).…”

“…The most familiar rare-earth precursor compounds are hexagonal Ln(OH) 3 [18][19][20] and monoclinic Ln 4 O(OH) 9 NO 3 [19,20,24] (Ln¼rare earth ions). Recently, some new rare-earth compounds including anion-exchangeable layered hydroxides Ln 2 (OH) 5 (A mÀ ) 1/m Á nH 2 O (Ln¼La, Pr, Nd, Sm-Tm, and Y, A¼intercalated anions) [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42], layered hydroxides Yb 2 (OH) 5 NO 3 Á 2H 2 O and Yb 2 (OH) 5 NO 3 Á H 2 O with coordinated NO 3 À accommodated in the gallery of hydroxide layers [43], anion-exchangeable oxy-hydroxide Yb 3 O(OH) 6 Cl Á 2H 2 O with one-dimensional channels containing uncoordinated Cl À [44], and layered hydroxides Ln 2 (OH) 4 SO 4 Á 2H 2 O pillared by sulfate ions [45,46] are reported, and the crystal structures are systematically investigated. The nitrate/NH 4 OH reaction system is one of the simplest for Y 2 O 3 :Eu 3 þ synthesis.…”

Rare earth and zinc layered hydroxide salts intercalated with the 2-aminobenzoate anion as organic luminescent sensitizer

“…The synthesis of yttrium hydroxide nitrate (LHS-Y/NO 3 ) was performed by a hydrothermal route [11]. A mixture of 7.5 mL of an aqueous solution (0.44 mol L À1 ) of yttrium nitrate, 2.5 mL of NaNO 3 (1.44 mol L À1 ) and 2.5 mL of NaOH (2.1 mol L À1 ) was placed in a sealed teflon vessel.…”

Layered Rare Earth Hydroxides: Structural Aspects and Photoluminescence Properties

“…Fogg and coworkers [22,[24][25][26][27][28] reported that crystalline compounds of RE 2 (OH) 5 NO 3 ·H 2 O were derived from such precipitates by drying at 80 C. To acquire samples of an improved quality, hydrothermal treatments were further employed. In a typical procedure, a solution containing RE 3+ ions was titrated by an alkali solution to a certain pH value.…”

“…The as-yielded slurry was transferred into an autoclave, tightly sealed, and heated at an elevated temperature (usually not higher than 250 C) to produce a crystalline sample. In addition to inorganic anions such as the halides and nitrate [22,[24][25][26][27][28] [3,30], could be obtained by adding an alkali into a solution containing RE ions and target anions. The conditions for precipitating RE 3+ ions are restricted compared with the preparation of LDH compounds.…”