Masahiko Iyoda

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Cyclooctatetraene (COT), the first 4nπ-electron system to be studied, adopts an inherently nonplanar tub-shaped geometry of D2d symmetry with alternating single and double bonds, and hence behaves as a nonaromatic polyene rather than an antiaromatic compound. Recently, however, considerable 8π-antiaromatic paratropicity has been shown to be generated in(More)
Recent progress in the study of electroconducting nanomaterials such as nanofibers, nanorods and other nanostructures based on the supramolecular self-assembly of hexabenzocoronenes, oligo(thiophene)s, tetrathiafulvalenes and perylene-3,4,9,10-tetracarboxylic diimides is described in this tutorial review. Conducting nanofibers and nanorods are constructed(More)
Absorption Cross Section and Semishape-Persistence Michele Williams-Harry,† Ajit Bhaskar,† Guda Ramakrishna,† Theodore Goodson, III,*,† Mika Imamura,‡ Akane Mawatari,‡ Kazumi Nakao,‡ Hideo Enozawa,‡ Tohru Nishinaga,‡ and Masahiko Iyoda*,‡ Department of Chemistry and Department of Macromolecular Science and Engineering, UniVersity of Michigan, Ann Arbor,(More)
One of the most important objectives in materials, chemical, and physical sciences is the creation of large conjugated macrocycles with well-defined shapes, since such molecules are not only theoretically and experimentally interesting but also have potential applications in nanotechnology. Fully unsaturated macrocycles are regarded as models for infinitely(More)
Cyclic tetrathiophenes 1, 2, and 3 planarized by dimethylsilyl, sulfur, and sulfone bridges bearing an antiaromatic cycloocatatetraene (COT) core were designed and synthesized to investigate the relationship among the bent angle, paratropicity, and HOMO-LUMO gap of the COT ring. The bent angles of the central COT rings of 1-3 were theoretically estimated(More)
A series of π-extended cyclic thiophene oligomers of 12, 18, 24, and 30 repeat units have been studied using methods of ultrafast time-resolved absorption, fluorescence upconversion, and three-pulse photon echo. These measurements were conducted in order to examine the structure-function relationships that may affect the coherence between chromophores(More)
A series of 3,4-propylenedioxythiophene (ProDOT) oligomers (nP(Hex)) with dihexyl side chains and methylthio end-capping units was synthesized as a model of poly(3,4-alkylenedioxythiophene)s. The slope of the linear relationship between the energy of the absorption maxima of nP(Hex) in the neutral states and the reciprocal of the number of monomer units(More)
Fully conjugated giant macrocyclic oligothiophenes with 60pi, 90pi,120pi, 150pi, and 180pi frames (1, 2, 3, 4 and 5) have been designed, and their butyl-substituted derivatives (1a, 2a, 3a, 4a, and 5a) have been synthesized using modified Sonogashira and McMurry coupling reactions as key steps. The 60-180pi systems 1-5 are circular with 1.8-6 nm inner(More)