Structural Variations in Complex Sodium Thorium Arsenates

Abstract

Three new sodium thorium arsenates, Na5Th4(AsO4)7 (1), Na5Th(AsO4)3 (2), and Na4Th(As2O7)2 (3) were synthesized via a high temperature route and their structures and optical properties were studied. Compound 1 adopts a three‐dimensional structure that consists of tetrameric fundamental building blocks (FBBs) [Th4(AsO4)7]5–, which are constructed by ThO8 and ThO9 polyhedra. The structures of 2 and 3 are based on open frameworks with channels running along the a or c axes, respectively, which are occupied by Na cations. Structural relations between the structures of 2 and 3 have been discussed regarding their composition. In contrast to the other two compounds, the arsenate anions in the structure of 2 play role of bridging ligands and do not connect more than two Th atoms. Owing to this, the underlying net of this compound contains only Th nodes has a lon topology. The Raman spectra of 1 and 2 contain similar peaks due to As–O vibrations of AsO4 groups, while the Raman spectrum of 3 differs significantly owing to the presence of As–O–As bridging group in As2O74– anions.

Elucidating Actinide–Pertechnetate and Actinide–Perrhenate Bonding via a Family of Th–TcO4 and Th–ReO4 Frameworks and Solutions

“…The last 2 decades has yielded structural insights into Th­(IV) coordination and speciation . Specifically relevant to the current study includes inorganic Th-oxoanion complexes with halogens − borate, sulfate, ,− molybdate, , chromate, nitrate, selenate, , and arsenate; assembled as oxoclusters, chains, sheets, and frameworks. , In addition to the specific knowledge of aqueous thorium complexation, structure, and reactivity; studies are carried out to expand our knowledge of trends across the f-block; and for example comparing structure and bonding of Ce­(IV), Th­(IV), U­(IV), Np­(IV), and Pu­(IV) …”

A series of novel phosphites/phosphates with deep-ultraviolet cut-off edges from 0D polar to 3D non-polar architectures

“…In recent years, the research on DUV NLO crystals has been mainly focused on phosphates/phosphites, 6 borates, 7 aluminates, 8 silicates, 9 germanates, 10 and iodates, 11 such as Ba 5 P 6 O 20 , 12 Li 3 [Al(PO 4 ) 2 (H 2 O) 1.5 ], 13 KBe 2 BO 3 F 2 , 14 CaCe(IO 3 ) 3 (IO 3 F)F, 15 Ba 4 Ag 5 (IO 3 ) 6 (I 3 O 8 ) 3 (I 4 O 11 ) 2 , 16 etc. Among them, several DUV NLO phosphate crystals have been reported and studied recently; 17 for example, LiHgPO 4 , 18 RbNaMgP 2 O 7 , 19 Cs 2 LiPO 4 , 20 K 2 Sb(P 2 O 7 )F, 21 and Ba 3 P 3 O 10 X (X = Cl, Br) 22 are found to have good NLO performance in the DUV region.…”

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

“…borophosphates, 36 aluminophophates, 37 silicophosphates, 38 and germanophophates. 39 Among these, aluminophosphate (AlPO) molecular sieves have been extensively studied for their structural diversity as well as potential applications in magnetic, separation, catalysis, ion-exchange, and nonlinear optical (NLO) materials. 40 The aluminium atom has more diverse oxygen coordination environments than that of phosphorus and can form 4-, 5-, and 6-folded AlO 4 tetrahedra, AlO 5 pyramids, and AlO 6 octahedra in inorganic phases.…”