DETAILED STRUCTURAL INVESTIGATIONS OF HIGHLY ALIGNED LB STRUCTURES OFTHIOPHENE DERIVATIVES

We investigated Langmuir-Blodgett (LB) films of the molecule 3-thienyl pentadecanoic acid (3TC15). Polarization-dependent Fourier transform i nfrared (FT-IR) spectroscopy and surface plasmon resonance (SPR) exper iments were performed and the results indicate that the molecules are oriented with their long axis upright on the substrate with a weak til t of 10-degrees. The thiophene moiety occupies an area per molecule wh ich allows a partial interpenetration of adjacent monolayers. The dete cted monolayer thickness of 2.33 nm is in good agreement with the mode l of interpenetrating layers.