Abstract
A new tellurium polyoxomolybdate hydrate (NH4)2K2TeMo6O22·2H2O was synthesized via the hydrothermal reaction method at 190 °C. The compound crystallizes in a one-dimensional tellurium polymolybdate [TeMo6O22]4− chain structure. The anionic polymeric chain is composed of Mo6O22 hexamers bridged together through sharing four corner oxygen atoms on the electron lone-paired TeO4 group. The Mo6O22 hexamer cluster is assembled from six distorted MoO6 octahedra in an edge-sharing manner. The ammonium and potassium cations distribute around the [TeMo6O22]4− chains and separate them from each other and maintain the charge balance. The thermal stability and optical properties of the compound were also investigated. The optical absorption data reveal that the compound is a wide band semiconductor with an optical band gap of 3.4 eV.
Highlights
Molybdate materials have attracted considerable research interests in recent years owing to their diverse crystal structures and promising applications in the field of nonlinear optics [1,2], catalysis [3,4,5], medicine [6,7,8], and photochromism [9,10]
Another example in the A–Te–Mo–O system is the novel tellurium polymolybdate A4TeMo6O22·2H2O (A = NH4, Rb), which crystallize in the one-dimensional [TeMo6O24]6− anionic chains with NH4+/Rb+ cations held together [34]
Dipole Moments and Local Distortion The local dipole moments for TeO4 and MoO6 structural units were calculated in order to Tbheettelorcuanl ddieprostlaenmdotmheendtisstfoorrtiToenOo4fatnhdeMeloeOctr6osntrulocntuer-aplauirneidtsTwe4e+reancdalcthuelasteedcoinndo-rorddeerr tJoahbne–ttTeerlluenrd(SeOrsJtTan) ddisthtoertdeidstMoroti6o+ncaotifotnhseinelethcetroconmlopnoeu-npda,iraesdaTllet4h+eaanbdotvheecsaeticoonnsd
Summary
Molybdate materials have attracted considerable research interests in recent years owing to their diverse crystal structures and promising applications in the field of nonlinear optics [1,2], catalysis [3,4,5], medicine [6,7,8], and photochromism [9,10]. There have been only two inorganic hydrated molybdates reported in the K-Te-Mo-oxide system: K6(TeMo6O24)·7H2O [17] and K4(Mo6Te2O24)·5.8H2O [18] The former crystallizes in the orthorhombic space group Pbca, and the basic building blocks were confirmed to be the Anderson type flat hexamolybdotellurate complex ion [TeMo6O24]6− with TeO6 octahedron centered [19]. Rare earth elements have been introduced into the hexamolybdotellurate clusters as structural linkers to form one-dimensional chain-like architecture [31,32,33]. Another example in the A–Te–Mo–O system is the novel tellurium polymolybdate A4TeMo6O22·2H2O (A = NH4, Rb), which crystallize in the one-dimensional [TeMo6O24]6− anionic chains with NH4+/Rb+ cations held together [34]. We report the synthesis, crystal structure determination, and properties characterization of the compound
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