Tatewaki Yoko, Hatanaka Tatsuya, Tsunashima Ryo, Nakamura Takayoshi, Kimura Mutsumi, Shirai Hirofusa
Collaborative Innovation Center for Nanotech FIBER, Shinshu University, Ueda 386-8567, Japan.
Chem Asian J. 2009 Sep 1;4(9):1474-9. doi: 10.1002/asia.200900044.
Tetrathiafulvalenes (TTF) S-TTF and R-TTF having four chiral amide end groups self-organize into helical nanofibers in the presence of 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyano-p-quinodimethane (F(4)TCNQ). The intermolecular hydrogen bonding among chiral amide end groups and the formation of charge-transfer complexes results in a long one-dimensional supramolecular stacking, and the chirality of the end groups affects the molecular orientation of TTF cores within the stacks. Electronic conductivity of a single helical nanoscopic fiber made of S-TTF and F(4)TCNQ is determined to be (7.0+/-3.0)x10(-4) S cm(-1) by point-contact current-imaging (PCI) AFM measurement. Nonwoven fabric composed of helical nanofibers shows a semiconducting temperature dependence with an activation energy of 0.18 eV.
具有四个手性酰胺端基的四硫富瓦烯（TTF）——S-TTF和R-TTF，在2,3,5,6-四氟-7,7',8,8'-四氰基对苯二醌二甲烷（F(4)TCNQ）存在的情况下自组装成螺旋纳米纤维。手性酰胺端基之间的分子间氢键以及电荷转移复合物的形成导致了长程一维超分子堆积，并且端基的手性影响了堆积内TTF核的分子取向。通过点接触电流成像（PCI）原子力显微镜测量，由S-TTF和F(4)TCNQ制成的单根螺旋纳米纤维的电导率被测定为(7.0±3.0)x10(-4) S cm(-1)。由螺旋纳米纤维组成的无纺布表现出半导体温度依赖性，其激活能为0.18 eV。
