Crystal Structure and Thermal Behavior of La(H2O)2M(C2O4)2·H2O (M=K, NH4) Studied by Powder X-Ray Diffraction

Hydrothermal synthesis, crystal structure and characterizations of a lanthanum(III) sulfate oxalate with a 3D network structure

“…The La-O distances are in the range of 2.410(5)-3.006 (5) A A (see caption of Fig. 1), comparable to those reported in other lanthanum sulfates and lanthanum oxalates [7,8,[18][19][20][21]. The oxalate group adopts an interesting octadentate chelating and bridging coordination mode, it chelates with four La(III) ions, forming two five- was only reported in its sodium-cobalt(II) mixed metal complex [22].…”

Metal Carboxylates with Open Architectures

“…Oxalato carbonates of the general formula [{Ln(H 2 O) 2 }(ox)(CO 3 ) 2 ] (Ln=Eu–Ho) exhibit 2D and 3D structures 74. Rare‐earth‐metal oxalate frameworks containing ammonium cations are known,75, 76a and some mixed‐metal rare‐earth‐metal oxalates with 2D and 3D structures possess zeolite‐like properties (Figure 16). 76a–e Thermal decomposition studies of M[La(H 2 O) 2 (ox) 2 ]⋅H 2 O (M=K, NH 4 ) show the existence of crystalline anhydrous K[La(ox) 2 ] and (NH 4 )[La(ox) 2 ], and in some cases ion‐exchange properties have been observed 76d.…”

“… a) Projection of the structure of K[La(ox) 2 (H 2 O) 2 ]⋅H 2 O that shows K + ions and water molecules present between the layers;76a b) Projection of the structure of K[La(ox) 2 (H 2 O) 2 ]⋅H 2 O that highlights the four‐membered rings formed by {[La(ox)] 4 } units 76a…”

Offene Metallcarboxylat‐Architekturen

“…Auch Seltenerdmetalloxalat‐Gerüste, die Ammoniumionen enthalten, sind bekannt 75. 76a Einige gemischte Seltenerdmetalloxalate mit zwei‐ und dreidimensionalen Strukturen haben Zeolith‐artige Eigenschaften (Abbildung 16). 76a–e Untersuchungen zur thermischen Zersetzung von M[La(H 2 O) 2 (ox) 2 ]⋅H 2 O (M=K, NH 4 ) belegen die Existenz von kristallinem wasserfreiem K[La(ox) 2 ] und (NH 4 )[La(ox) 2 ]; in manchen Fällen wurden Ionenaustauschereigenschaften beobachtet 76d.…”