Switchable Columnar Phase Formed from Bent-Shaped Molecules with Low Bent-Angle Naphthalene Central Core and Alkylthio Tail
摘要:
Novel low-angle bent molecules with 1,7-naphthalene central core and alkylthio tails form the hexagonal columnar phase as well as the well-known B4 phase. The columnar phase has a large two-dimensional hexagonal lattice of 65-70 angstrom and exhibits the antiferroelectric switching with the spontaneous polarization along the column axis. The column is considered to be constructed by the cylindrically enclosed layer.
New bent-shaped molecules with naphthalene central core and alkylthio tail are prepared, and their banana phase structures and properties are discussed in comparison with those of conventional alkoxy molecules.
Electric-field-induced transition between ferro- and antiferroelectric ground states observed in the B7 phase of a bent-shaped molecule with alkylthio tails
We prepared a new bent-shaped molecule, in which dodecylthio tails and typical Schiff-based side wings are substituted on a conventional phenyl central core. This molecule forms the B7 phase in a temperature region from 117 to 142 °C, which shows characteristic banana leaf and circular domain textures. On application of an electric field, the B7 phase is easily transformed to the B2 phase with two different ground states, depending on the temperature. In the higher temperature region, the B2 phase possesses a homochiral ferroelectric (SmCSPF) ground state, whereas the lower temperature B2 phase has a homochiral antiferroelectric (SmCAPA) ground state. These two states transformed into each other reversibly at 124 °C under the applied field, while they are stable over the mesophase temperature on the field-off state.
Photoreaction of nitrobenzene derivatives with alkyl thiols giving sulfonamides and derivatives
作者:Hideya Yuasa、Tomohiro Yube、Takashi Kanamori
DOI:10.1080/10426507.2023.2195651
日期:2023.9.2
atom. The photoreaction by-produced p-sulfanyl, aniline, and o-sulfonyl derivatives presumably through SRN1 mechanism from the p-substituted nitrobenzene, photo-desulfonylation, and photo-Fries rearrangement from the sulfonamide, respectively. Discovery of this photoreaction will expand the scope of the chemistry of nitro and thiol compounds, since the sulfonamides are expected to find extensive applications
摘要 在这里,我们偶然发现硝基苯衍生物与烷基硫醇的光照射在不添加其他试剂的情况下以低产率产生磺酰胺。我们提出了一种新的光反应机理,其中光激发的硝基苯双自由基从HS中夺取一个氢原子,生成的硫基自由基与硝基中的氮原子发生偶联,硝基中的两个氧原子转移到硫原子。光反应副产物对硫酰基、苯胺和邻磺酰基衍生物可能是通过 S RN 1 机制从p分别是磺酰胺的-取代硝基苯、光脱磺酰化和光弗赖斯重排。这种光反应的发现将扩大硝基和硫醇化合物的化学范围,因为磺酰胺有望得到广泛的应用。
[EN] LIGHT SULFONAMIDE SYNTHESIS REACTION<br/>[FR] RÉACTION DE SYNTHÈSE DE SULFONAMIDE LÉGER<br/>[JA] 光スルホンアミド合成反応
A series of 4-substituted phenylguanidinium derivatives was synthesized and its antimicrobial activity was evaluated in vitro against eight potentially pathogenic strains of fungi.