Structure directing effects of different templates on the packing arrangements of the polyoxo molybdenum (V) organophosphonate ion { {Na [Mo6O12 (OH) 3 (O3PC6H5) 4] 2} }9−

Influence of organic amines on the self-assembly of hybrid polyoxo-molybdenum(v) phosphate frameworks

“…The assembly of these materials often involves a dimeric {Mo 6 } 2 species as the inorganic building block, owing to its ability to incorporate various alkali and transition metal cations such as Na, Fe, Zn, Co and Ni. [4][5][6][7][8][9][10][11] This is because the unique coordination environment of these metal cations, provided by the POMP cluster, renders them interesting candidates for transition metal-mediated catalytic applications. In addition, the outer sphere of the {Mo 6 } 2 cluster features protonated phosphate ligands and can therefore be considered as a solid acid.…”

“…12 The chemical properties of the cluster can be further fine-tuned by substitution of the inorganic phosphate groups with phosphonate moieties and thereby give access to a range of organo-functionalized structures. 4,13 The self-assembly of these POMP anions in the presence of structure-directing protonated organic amines can result in the formation of porous frameworks with layered or channel-like structures which have potential applications as multifunctional materials in catalysis and separation processes. 7,8,14 However, the structure-directing effect of organic amines is not restricted to the formation of novel frameworks.…”

Preparation and characterisation of some new Mo/O/XR (X = P or As) heteropoly blue complexes

“…3 The latter was shown to intercalate amines and other neutral organic molecules. The orange-red molydophosphonates reported by Khan et al, 14 Cao et al 15 and Gammersbach et al 16 are salts containing a sandwich structure of two hexanuclear oxomolybdenum(V) organophosphonate clusters linked by a sodium cation, {Na[Mo 6 O 12 (OH) 3 (O 3 PC 6 H 5 ) 4 ] 2 } 92 . In another series of molybdenum organophosphonates synthesised by Chang et al, 12 using MoO 2 (acac) 2 (acac ~acetylacetonate) as the starting material, clusters of Mo(VI) with cyclic structures based on edge-and corner-sharing Mo octahedra and ligand tetrahedra were obtained.…”