Influence of 2‐Aminopyridine on the Formation of Molybdates under Hydrothermal Conditions

Abstract

The hydrothermal reaction of an aqueous ammonium heptamolybdate solution with first-row transition metal salts in the presence of 2-aminopyridine at around 180°C and under autogenous pressure yields several molybdates, such as the 1D chains in (C 5 N 2 H 7 ) 4 (3)] The structures of these materials were established by single-crystal and powder X-ray diffraction

The Hydrothermal Synthesis of Transition Metal Complex Templated Octamolybdates

“…However, in the majority of these solids A occurs as a discrete unit, whereas B occurs as a discrete protonated cluster in only one example [27] as it invariably gets derivatized by the organic group or condensed to form a 1D chain through three kinds of linkages, i.e. sharing edges, corners and pair -M-O-M-bridges, [20] or links through metal complexes to form 2D sheets (see Figure S5 in the Supporting Information). This is probably due to the large negative charge present on the anion B.…”

“…In our earlier work, we also observed www.eurjic.orgthat in the presence of a better leaving group, such as 2-aminopyridine, cobalt yielded a heptamolybdate while copper yielded Lindgrenite-type copper molybdate as both cobalt and copper complex weakly with 2-aminopyridine. [20] In the presence of imi, copper forms a bis complex by cis addition. This prefers to derivatize cluster B and form the supramolecular assembly in 1 (Figure 2).…”

“…Apart from these, nonbonding interactions taking place between molybdate cluster anions and organic groups along with water molecules will influence the crystal structure packing. In our earlier work, [20] we have shown how a weak ligand such as 2-aminopyridine (pK a ≈ 6.9) affects the hydrolysis and condensation reactions taking place in aqueous molybdate solution containing first-row transition metal ions. Acidification of aqueous molybdate solution in the presence of organic cations yields a variety of POM cluster anions with varying numbers of molybdenum atoms.…”

A combined theoretical and experimental study of electronic structure and optical properties of β-ZnMoO4 microcrystals

“…However, β-ZnMoO 4 crystals have a wolframite-type monoclinic structure, space group P2/c and point group symmetry C 4 2h [6]. In the monoclinic structure, the zinc and molybdenum atoms are surrounded by six oxygens which form the distorted octahedral [ZnO 6 ]/[MoO 6 ] clusters [6].…”

“…In the monoclinic structure, the zinc and molybdenum atoms are surrounded by six oxygens which form the distorted octahedral [ZnO 6 ]/[MoO 6 ] clusters [6]. Both α-and β-ZnMoO 4 crystals in undoped and doped forms have been investigated because of their interesting electronic properties and high potential for possible industrial applications in various scientific fields such as: luminescence [7][8][9], red/green phosphors for lightemitting diodes [10][11][12][13][14][15][16], cryogenic/bolometric scintillating detectors [16][17][18][19], microwave dielectric [20], anticorrosive paints [21], cathode electrode in lithium batteries [22], photocatalyst for degradation of Victoria blue R and methyl orange dyes [23,24], and as a humidity sensor [25].…”