INFRARED SPECTROSCOPIC STUDIES ON THE STRUCTURE AND ORDERING OF HEXADECANOYLTETRATHIAFULVALENE CONDUCTING LANGMUIR-BLODGETT MULTILAYERS

Fourier transform infrared spectroscopy has been used to study molecular ordering and conductivity processes of a HDTTF charge-transfer salt deposited in Langmuir-Blodgett multilayers onto silicon and metal substrates. Both the chemistry and the degree of conductivity may be easily monitored “in situ” as a function of doping level. Linear dichroism measurements confirm the vertical alignment of hydrocarbon chains needed to produce lateral electron mobility via well-ordered, fulvalene rings. Both I2 and Br2 readily act as oxidizing dopants for this particular donor, but only I2 produces an organic conductor. © 1990, American Chemical Society. All rights reserved.