Abstract
A new two-dimensional (2D) polyoxoniobate K 2[Cu(H 2O) 6]{[Nb 6O 19][Cu(NH 3)] 2}·8H 2O ( 1) has been synthesized by the diffusion method and structurally characterized by elemental analyses, infrared (IR) spectrum, ultraviolet (UV) spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric (TG) analysis and single crystal X-ray diffraction. Crystal structure analysis reveals that 1 exhibits a novel 2D network architecture constructed from Lindqvist-type [Nb 6O 19] 8− polyoxoanions and copper coordinated cations. The XPS measurement indicates the oxidation state of Cu ion is +2. Surface photovoltage spectroscopy (SPS) and electric field induced surface photovoltage spectroscopy (EFISPS) measurements indicate that 1 possesses the n-type semiconductor characteristic.
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