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Diprotonated [28]Hexaphyrins(1.1.1.1.1.1): Triangular Antiaromatic Macrocycles
Ishida, Shin‐,ichiro,Higashino, Tomohiro,Mori, Shigeki,Mori, Hirotaka,Aratani, Naoki,Tanaka, Takayuki,Lim, Jong Min,Kim, Dongho,Osuka, Atsuhiro WILEY‐VCH Verlag 2014 Angewandte Chemie Vol.126 No.13
<P><B>Abstract</B></P><P>Protonation of <I>meso</I>‐aryl [28]hexaphyrins(1.1.1.1.1.1) triggered conformational changes. Whereas protonation with trifluoroacetic acid led to the formation of monoprotonated Möbius aromatic species, protonation with methanesulfonic acid led to the formation of diprotonated triangular antiaromatic species. A peripherally hexaphenylated [28]hexaphyrin was rationally designed and prepared to undergo diprotonation to favorably afford a triangular‐shaped antiaromatic species.</P>
Ishida, Masatoshi,Kim, Soo-Jin,Preihs, Christian,Ohkubo, Kei,Lim, Jong Min,Lee, Byung Sun,Park, Jung Su,Lynch, Vincent M.,Roznyatovskiy, Vladimir V.,Sarma, Tridib,Panda, Pradeepta K.,Lee, Chang-Hee,Fu Nature Publishing Group 2013 Nature chemistry Vol.5 No.1
Proton-coupled electron transfer (PCET) processes are among the most important phenomena that control a variety of chemical and biological transformations. Although extensively studied in a variety of natural systems and discrete metal complexes, PCET mechanisms are less well codified in the case of purely organic compounds. Here we report that a planar 棺,棺??phenylene-bridged hexaphyrin (1.0.1.0.1.0), a 24 ?-electron antiaromatic species termed rosarin, displays unique redox reactivity on protonation. Specifically, treatment with acid (for example, HI) yields a 26 ?-electron aromatic triprotonated monocationic species that is produced spontaneously via an intermediate??but stable??25 ?-electron non-aromatic triprotonated monoradical dication. This latter species is also produced on treatment of the original 24 ?-electron antiaromatic starting material with HCl or HBr. The stepwise nature of the proton-coupled reduction observed in the planar rosarin stands in marked contrast to that seen for non-annulated rosarins and other ostensibly antiaromatic expanded porphyrinoids.
Brane-localized masses in magnetic compactifications
Ishida, Makoto,Nishiwaki, Kenji,Tatsuta, Yoshiyuki American Physical Society 2017 Physical review. D Vol.95 No.9
<P>We discuss the effects of the brane-localized mass terms on the fixed points of the toroidal orbifold T-2/Z(2) under the presence of background magnetic fluxes, where multiple lowest and higher-level Kaluza-Klein (KK) modes are realized before introducing the localized masses in general. Using linear algebra, we find that, in each KK level, one or more of the degenerate KK modes are almost inevitably perturbed, when single or multiple brane-localized mass terms are introduced. When the typical scale of the compactification is far above the electroweak scale or the TeV scale, we apply this mechanism for uplifting unwanted massless or light modes which are prone to appear in models on magnetized orbifolds.</P>
Ishida, Yoshihito,Yokomachi, Kazutoshi,Seino, Makoto,Hayakawa, Teruaki,Kakimoto, Masa-aki The Polymer Society of Korea 2007 Macromolecular Research Vol.15 No.2
Hyperbranched polysiloxysilanes (HBPSs), with a variety of terminal functional groups (vinyl, epoxy, carboxyl and hydroxyl), were synthesized by the self-polymerization of an $AB_3$ type monomer of tris(dimethylvinylsiloxy) silane, with subsequent end-functionalizations, such as epoxidation and radical addition reaction, respectively. The ratio of the $\alpha-and$ $\beta-addition$ linkages in the HBPS polymerized by hydrosilylation of the $AB_3$ monomer was found to be approximately 1 to 3. The thermal stability and solubility were affected by the terminal functional groups.
Ishida, Noriko,Iyoda, Yumi,Mitamura, Osamu,Choi, Jun-Kil The Korean Society of Limnology 2008 생태와 환경 Vol.37 No.1
The abundance and community structure of epilithic diatoms grown on different substrata were investigated in two first-order streams located in a limestone and granite area, north of the Suzuka Mountains in Central Japan. Experiments were conducted as follows: limestone and granite without algae were submerged in their own streambed or another stream station and incubated for seven weeks, while limestone and granite with algae were transferred to another stream station and incubated at the same time. The diatom biomass was consistently high in the lime-stone station experiments compared to those at the granite station. In addition, there was more diatom biomass on granite substrata than on the limestone substrata at both stations. The present results suggested that the difference in water chemistry including the major nutrient concentrations was the limiting factor for algal growth in these two streams; however, when the water chemistry was the same in each stream, the difference in substratum characteristics became the important factor affecting the diatom abundance. The diatom community grown on the transferred substrata with and without algae became similar to those grown on the original substrata in each stream during the incubation period. It was suggested that the effect of the substrata characteristics on the diatom community structure was rather small.
Tachyon vacuum solution in open string field theory with a constant <i>B</i> field
Ishida, Akira,Kim, Chanju,Kim, Yoonbai,Kwon, O-Kab,Tolla, D D The Institute of Physics 2009 JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL Vol.42 No.39
<P>We show that Schnabl's tachyon vacuum solution is an exact solution of the equation of motion of Witten's open bosonic string field theory in the background of a constant antisymmetric two-form field. The action computed at the vacuum solution is given by the Dirac–Born–Infeld factor multiplied to that without the antisymmetric tensor field.</P>