D.C. conductivity versus temperature of a metallic complex of (CH)x with potassium
Abstract We have measured the electrical conductivity σ of heavily K-doped cis -(CH) x as a function of temperature between 300 K and 4.2 K. A semiconductor-like behaviour of σ is observed and the attempt to explain our data led us to examine a conduction model involving tunnelling between potential barriers. Two activation energies are observed and the transition that occurs in the conductivity behaviour could arise from inhomogeneous doping.
Finding environmentally gentle methods to graft Lewis acid on the surface of mesoporous materials is a topic of current interest. Herein we describe the optimization of a preparation procedure of a mesoporous silica-supported ErIII catalyst using the microwave-assisted post-calcination functionalization of Mobil Composition of Matter-41 silica as the key step. The required time for functionalization was reduced from several hours to 10 min using sealed-vessel microwave technology. Control experiments using conventional heating at the same temperature demonstrated that the rate increase is owing to a simple thermal/kinetic effect as a result of the higher reaction temperature. The resulting ErIII catalyst was tested for the first time as a catalyst in the continuous flow deprotection of benzaldehyde dimethylacetal and a complete leaching study was performed.