Aligned 1-D Nanorods of a pi-Gelator Exhibit Molecular Orientation and Excitation Energy Transport Different from Entangled Fiber Networks

作者：Sakakibara Keita; Chithra Parayalil; Das Bidisa; Mori Taizo; Akada Misaho; Labuta Jan; Tsuruoka Tohru^*; Maji Subrata; Furumi Seiichi; Shrestha Lok Kumar; Hill Jonathan P; Acharya Somobrata; Ariga Katsuhiko; Ajayaghosh Ayyappanpillai

来源：Journal of the American Chemical Society, 2014, 136(24): 8548-8551.

DOI：10.1021/ja504014k

Linear pi-gelators self-assemble into entangled fibers in which the molecules are arranged perpendicular to the fiber long axis. However, orientation of gelator molecules in a direction parallel to the long axes of the one-dimensional (1-D) structures remains challenging. Herein we demonstrate that, at the air-water interface, an oligo(p-phenylenevinylene)-derived pi-gelator forms aligned nanorods of 340 +/- 120 nm length and 34 +/- 5 nm width, in which the gelator molecules are reoriented parallel to the long axis of the rods. The orientation change of the molecules results in distinct excited-state properties upon local photoexcitation, as evidenced by near-field scanning optical microscopy. A detailed understanding of the mechanism by which excitation energy migrates through these 1-D molecular assemblies might help in the design of supramolecular structures with improved charge-transport properties.

• 出版日期2014-6-18