Polyoxotungstate-Surfactant Layered Crystal toward Conductive Inorganic-Organic Hybrid

A polyoxotungstate-surfactant hybrid layered compound was synthesized as a single phase by using decatungstate ([W 10O 32] 4？, W 10) and hexadecylpyridinium (C 16py). The X-ray structure analysis combined with infrared spectroscopy and elemental analysis revealed the formula to be (C 16py) 4[W 10O 32] (C 16py-W 10). The layered structure consisted of alternative stacking of W 10 inorganic monolayers and interdigitated C 16py bilayers with layered periodicity of 23.3 ？. Each W 10 anion in the W 10 inorganic monolayers was isolated by the hydrophilic heads of C 16py. The hybrid crystals of C 16py-W 10 decomposed at around 500 K. The conductivity of the hybrid layered crystal was estimated to be 4.8 × 10 ？6 S cm ？1 at 423 K by alternating current (AC) impedance spectroscopy.