The Polar Sulfonic Groups Influence on Structure of Self-Assembled Tetrapyrrolic Molecules

摘要

An understanding of both the interactions between the adsorbate molecules and the interactions between adsorbates and the surface is a prerequisite to eventually controlling the self-assembly process in supramolecular aggregation. Here we report the formation of supramolecular structures (J-aggregates) whose size and aggregation pattern are controlled by changing the number of polar sulfonic groups of meso-tetra (4-sulfonatophenyl) porphine. Using atomic force microscopy we show that substituted porphyrin molecules (5,10,15,20-tetrakis(4-sulfonatophenyl) porphine (TPPS_4), 5,10,15-tris(4-sulfonatophenyl)-20-phenyl porphine (TPPS_3), 5, 15-bis(4-sulfonatophenyl)-10,20-diphenyl porphyne (TPPS_(2op)) - SO_3 groups are opposite each other, and 5,20-bis(4-sulfonatophenyl)-10,15-diphenyl porphyne (TPPS_(2a)) - SO_3 groups are adjacent each other) form different spatial structures. Our findings suggest that placement of functional groups that are participating in direct noncovalent interactions will allow design and construction of different supramolecular structures adsorbed to surfaces.