Construction and isomeric transformation of polyoxometalates directed by 1,ω-bis(pyridinium)alkane templates

Abstract

Ten novel inorganic-organic hybrid polyoxometalates, namely, [1,3-bis(pyridinium) propane] 2 [a-Mo 8 O 26 ] (1), [1,4-bis(pyridinium) 10), (Scheme 1) were synthesized by cation templated self-assembly with octamolybdate anions under hydrothermal reaction conditions. Crystal data analysis revealed that these compounds were all composed of discrete organic cations and polyacid anions [Mo 8 O 26 ] 4À interacting by electrostatic and hydrogen bond interactions. Interestingly in these compounds the anion fraction could take on a-, b-, q-, g-[Mo 8 O 26 ] 4À 0D isomers or rare 1D-polymeric frameworks with a simple length modification of the alkane components. Moreover, these polyacid compounds had definite catalytic activities on the oxidation reaction of acetaldehyde to acetic acid and the relationship of structure/catalytic activities were initially demonstrated.Scheme 1 Schematic representation of the 1,u-bis(pyridinium)alkane dications (n ¼ 3-12).

Inorganic–Organic Hybrid Surfactant Crystals: Structural Aspects and Functions

“…Catalytic behavior is another characteristic of POM anions [24]. Catalytic oxidation of acetaldehyde with H 2 O 2 has been explored for bolaamphiphilic 1,ω-bis(pyridinium)alkane-Mo 8 hybrid crystals (ω = 8-12) [134].…”

“…In addition, heterocyclic surfactants such as pyridinium ([C 5 H 5 N(C n H 2n+1 )] + (C n py), Figure 6e) [118,[120][121][122][127][128][129], pyridazinium ([C 4 H 4 N 2 (C n H 2n+1 )] + (C n pda), Figure 6f) [128], and methylimidazolium ([(C n H 2n+1 )C 3 H 3 N 2 (CH 3 )] + (C n mim), Figure 6g) [123,124] are employed. Double-headed surfactants employed are alkyldiammonium derived from diamine ([H 3 N(CH 2 ) n NH 3 ] 2+ (H 3 NC n NH 3 ), Figure 6d) [132,133] or synthetic bolaamphiphiles having two charged heterocyclic moieties [134][135][136].…”

Synthesis, Structures, and Properties of {(BDMLP)2[Pb2I8]} and {(MLDE)[PbI3]} Induced by N-Containing Organic Cation Templates

“…As a branch of the metal halides and pseudohalides, Pb(II) halides occupy an important position. [14] Here, we reported the synthesis, crystal structure and spectral properties of two PbI 2 hybrid complexes {(BDMLP) 2 …”

“…[1][2][3][4][5][6][7][8] And then a number of compounds or materials owning special properties were synthesized by rare-earth metals integrated with organic cations. They had been widely applied in optics, magnetics, catalysis, and analysis from 1980s.…”

Highly Selective Oxidation of Sulfides to Sulfones by H2O2 Catalyzed by Porous Capsules

“…Different catalysts such as polyoxometalates, acid catalysts, enzymes, and metal catalysts have been used for the oxidation of sulfides [11][12][13][14][15]. Polyoxometalates (POMs) are a class of metal oxide nanoclusters offering rich structural versatility, accessibility and different applications in the fields of analytical chemistry, medicine, electrochemistry, photochemistry, and catalysis [16][17][18]. Deng and co-workers cited that these compounds have a large number of excellent catalytic properties.…”