Electrical transport properties of a supramolecular assembly

The direct current conductivity of the urea–[CuIL2]PF6 supramolecular assembly (1) has been measured in the temperature range 24–118°C. It is found that 1 behaves as a semiconductor in 24–33°C, as a metal in 33–63°C and again as a semiconductor in 63–118°C. Such transitions between semiconductor and metal like behaviour have not been observed earlier in the clathrates.