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Electronic properties of tetrathiafulvalene‐modified cyclic‐β‐peptide nanotube
Author(s) -
Uji Hirotaka,
Kim Hyunji,
Imai Tomoya,
Mitani Shota,
Sugiyama Junji,
Kimura Shunsaku
Publication year - 2016
Publication title -
peptide science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.22850
Subject(s) - tetrathiafulvalene , chemistry , nanotube , fourier transform infrared spectroscopy , substrate (aquarium) , crystallography , carbon nanotube , chemical physics , nanotechnology , materials science , chemical engineering , molecule , organic chemistry , oceanography , geology , engineering
Cyclic tri‐β‐peptide having tetrathiafulvalene (TTF) at the side chain was synthesized to prepare a peptide nanotube aligning TTF side chains along the nanotube. The polarized light microscopic observations revealed crystallization of the cyclic peptide by the vapor diffusion method. Fourier‐transform infrared and electron diffraction measurements of the crystals clarified formation of homogeneous hydrogen bonds making a columnar structure with a layer spacing of 4.9 Å. Electronic measurements of the peptide crystals on a gold mica substrate were carried out by the current sensing AFM. The current–voltage curves showed a rectification behavior, whose profile was consistent with a metal and p ‐type semiconductor junction. The p ‐type property is supported by the first principle calculations, which showed the HOMO orbital delocalizing fully over the plane of the TTF ring with the energy level of −5.1 eV. © 2016 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 106: 275–282, 2016.