Na₇Y₂(P₂O₇)₂ (P₃O₁₀) – A New Layer and Tunnel Structure

Abstract

A new layered phosphate, Na7Y2(P2O7) 2(P3O10), containing both [P2O7]4− and [P3O10]5− groups, has been prepared. It crystallizes in the monoclinic space group P2/c with a = 16.205(4), b = 5.3746(9), c = 12.309(4) Å, β = 97.96(2)°, V = 1061.7(5) Å3 and Z = 2. The structure was solved and refined to R1 = 0.0298 and wR2 = 0.0698 for 1844 independent reflections with I > 2σ(I). It consists of layers of corner and edge‐sharing YO7 polyhedra, P2O7 and P3O10 groups. Each layer is built up from two parallel [YP2O7] slabs, held together by the P3O10 groups. This arrangement gives rise to intersecting tunnels within the layer. The Na+ cations are located in the tunnels and between the layers. Both P2O7 and P3O10 groups contain unshared oxygen atoms directed toward the interlayer space and toward the tunnels. The P2O7 groups show a staggered configuration. In addition to this original layered framework, the title compound provides the third example of a compound containing a mixed anion of [P2O7]4− and [P3O10]5−. The structure was compared with the two previously reported ones, containing such a mixed anion: NH4Cd6(P2O7) 2(P3O10) [6] and Cs2Mo5O2(P2O7)3 · (P3O10) [7].

Inorganic Lanthanide Compounds with Complex Anions

“…The oxygen atoms belong to five P 2 O 7 4ions, i.e., one of the latter acts as a chelating ligand. A unique diphosphate is the sodium compound Na 7 Y 2 -(P 2 O 7 ) 2 (P 3 O 10 ) 286 because it contains additionally the catena-triphosphate anion P 3 O 10 5-. In the crystal structure the Y 3+ ions are connected by the diphosphate ions which act as chelating ligands to layers in the [001] direction.…”

Li3[Al(PO4)2(H2O)1.5] and Na[AlP2O7]: from 2D layered polar to 3D centrosymmetric framework structures

“…[21][22][23][24] Their rich structural diversity has resulted in the discovery of thousands of inorganic phosphates. [25][26][27] For example recently it has been noticed that mixed oxo-anionic phosphates with different degrees of phosphate group polymerization can also be synthesized, such as Na 4 Mg 3 ij(PO 4 ) 2 IJP 2 O 7 )], Rb 6 Bi 4 ij(PO 4 ) 2 IJP 2 -O 7 ) 3 ], Na 4 Ni 5 ij(PO 4 ) 2 IJP 2 O 7 ) 2 ], Na 7 Y 2 ij(P 2 O 7 ) 2 IJP 3 O 10 )], KMg 6 ij(P 2 -O 7 ) 2 IJP 3 O 10 )], Pb 2 Cd 3 ij(PO 4 ) 2 IJP 2 O 7 )], and TI 3 Ti 3 Oij(PO 4 ) 3 IJP 2 -O 7 )], [28][29][30][31][32][33][34] which even violate Pauling's fifth rule. 35 However, to the best of our best knowledge, these structural types of phosphates are still rarely reported.…”

Design Rules, Accurate Enthalpy Prediction, and Synthesis of Stoichiometric Eu3+ Quantum Memory Candidates

“…For Na 7 Eu 2 (P 2 O 7 ) 2 (P 3 O 10 ), we followed the procedure used for its only reported isostructural compound, Na 7 Y 2 (P 2 O 7 ) 2 (P 3 O 10 ) . The resulting product also contained EuPO 4 , along with unidentifiable phase(s).…”