Precipitation synthesis of lanthanide hydroxynitrate anion exchange materials, Ln2(OH)5NO3·H2O (Ln=Y, Eu–Er)

Synthesis and Aqueous Colloidal Solutions of RE2(OH)5NO3·nH2O (RE = Nd and La)

“…The layered hydroxides [RE 4 (OH) 10 (H 2 O) 4 ]A (RE = rare earths, A = 2,6-naphthalenedisulfonate and 2,6-anthraquinonedisulfonate), pillared by organic disulfonates, show capability as heterogeneous catalysts in "green" chemistry. [1] A family of RE 2 (OH) 5 NO 3 ·nH 2 O was then synthesized under hydrothermal conditions, exhibiting a large ionexchange capacity for a wide range of organic anions.…”

“…[1,2] In previous work, however, it was demonstrated that a hydrothermal reaction under controlled pH conditions or by using the precipitation method can extend the RE 2 (OH) 5 NO 3 ·nH 2 O family to the larger rareearth members such as Gd, Eu, and Sm. [9,10] Nevertheless RE = Nd and La members have not yet been synthesized. They were expected to form the corresponding single phases without a RE(OH) 3 impurity at pH Ͻ 6.5, but no precipitate was obtained after the hydrothermal reaction was performed under such low-pH conditions.…”

Interacting layered hydroxide nanosheets with KF leading to Y/Eu hydroxyfluoride, oxyfluoride, and complex fluoride nanocrystals and investigation of photoluminescence

“…1 shows powder XRD patterns of all the products obtained in this work. The precursor precipitated at $4 C exhibits a series of 00l and non-00l diffractions that are characteristic of the orthorhombic structured LREH-NO 3 À compound, 38,39,41,44,45 whose lattice parameters were analysed to be a $ 1.2699(3), b $ 0.7140(1), and c $ 1.6870(1) nm with the JADE 6.5 soware.…”

Changes in crystal phases and morphologies of rare earth hydroxide nitrates with ionic radius

“…Journal of the Ceramic Society of Japan 125 [10] 9 (NO 3 ). 10) According to CHN elemental analysis, measured nitrogen content (1.56 wt % in Ho-pH 9) accords closely with theoretical one (1.57 wt %).…”

“…Li and Yanagisawa reported that three kinds of yttrium hydroxide nitrates, Y(OH) 3 (M1), Y 2 (OH) 5.14 (NO 3 ) 0.86 ·H 2 O (M2) and Y 4 O(OH) 9 NO 3 (M4), were prepared by changing pH and temperature in hydrothermal treatment. 13) They also drew a pHtemperature phase diagram.…”