Two new purely inorganic cationic tellurite networks
of Group IB
metal-based tetrafluoroborates, namely, [Cu2F(Te2O5)](BF4), 1, and [Ag18O2(Te4O9)4(Te3O8)(BF4)2]·2HBF4, 2, have been hydrothermally synthesized under mild
conditions. The prepared materials have been characterized by single-crystal
X-ray diffraction, powder X-ray diffraction, IR and Raman spectroscopy,
SEM–energy-dispersive spectroscopy, UV–vis–NIR
diffuse reflectance, magnetic study, and TG analyses. Single-crystal
diffraction studies show that both materials have similar cationic
Cu/Ag tellurite layers with tetrafluoroborates as interlamellar charge-balancing
anions. Magnetic results indicate that [Cu2F(Te2O5)](BF4), 1, exhibits a mainly
short-range antiferromagnetic ordering within the 2D layer, and further
detailed analysis of magnetic susceptibility analysis confirms a spin-singlet
ground state with an energy gap of 85 K.
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