Arrangement of tripod dyes with different linkages at the air-water interface

POLY 524

Han-gyu Park, drline2@nate.com1, Soo Young Park2, and Daewon Sohn1. (1) Department of Chemistry, Hanyang University, 17 Haengdang Dong Seoul 133-791, Korea, Seoul, South Korea, (2) School of Materials Science & Engineering, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, Seoul, South Korea
Arrangement of tripod dyes, N1,N3,N5-tris(4-(5-(3,4,5-tridodecyloxyphenyl)-1,3,4-oxadiazol-2-yl)phenyl)benzene-1,3,5-tricarboxamide, A3O-3 (amide linkage), and tris(4-(5-(3,4,5-tridodecyloxyphenyl)-1,3,4-oxadiazol-2-yl)phenyl)benzene-1,3,5-tricarboxylate, E3O-3 (ester linkage), at the air-water interface was investigated by Langmuir Blodgett film balance. Surface pressure (П) vs. surface area (A) isotherm of tripod dyes shows sharp transition at 1802/molecules for E3O-3 and 200 2/molecules for A3O-3. The difference is due to the hydrogen bonding capability of the tripod dye molecules at the air-water interface. Line shape of the aligned tripod dyes transferred on the graphite was observed by SPM (scanning probe microscope). The density of lines increased and the lines rearranged into one direction by decreasing the surface area. It is observed that a C-H stretch peak shift by decreasing the surface area through an ATR (attenuated total reflectance) measurement.