Synthesis, orientation and conductivity investigation of a new porphyrin Langmuir-Blodgett film

Abstract

A new amphiphilic porphyrin with only one hydrophilic substituent is synthesized and the orientation and conductivity of its Langmuir-Blodgett film are investigated. The results show that the porphyrin rings stand on the surface with an orientation angle of less than 16° with respect to the surface normal, and adopt a face-to-face stacking arrangement in the direction of compression. The film has a high degree of conductivity anisotropy. After doping with iodine vapour, the in-plane conductivity parallel to the compression direction is 3.95 × 10^–4 S cm^–1, and that perpendicular to it is 1.34 × 10^–8 S cm^–1.