We herein propose a new type of efficient neutral photoacidgenerator. A photoinduced 6π-electrocyclization reaction of photochromic triangle terarylenes triggers subsequent release of a Brønsted acid, which took place from the photocyclized form. A H-atom and its conjugate base were introduced at both sides of a 6π-system to form the self-containedphotoacidgenerator. UV irradiation to the 6π-system
我们在此提出了一种新型高效的中性光酸产生剂。光致变色三角四萘嵌苯的光诱导 6π-电环化反应触发了布朗斯台德酸的后续释放,该反应从光环化形式发生。在 6π 体系的两侧引入 H 原子及其共轭碱以形成自含的光酸产生剂。对 6π 系统的紫外线照射会产生一个带有 H 原子的环己-1,3-二烯部分和分别位于 sp(3) C-原子的 5 位和 6 位的共轭碱,这会自发地释放酸分子定量形成多环芳烃化合物。证明了在环境条件下光酸产生的净量子产率高达 0.52,并证明了环氧单体的光引发阳离子聚合。
Photon-Quantitative Reaction of a Dithiazolylarylene in Solution
作者:Sayo Fukumoto、Takuya Nakashima、Tsuyoshi Kawai
DOI:10.1002/anie.201006844
日期:2011.2.11
Ready for action: An excellent quantum yield was observed for a photocoloration reaction of a photochromic molecule based on a triangular terarylene structure. The molecule is brought into a conformation favorable for photocyclization by multiple intramolecular interactions, including CHN hydrogen bonding and SN and CHπ interactions (see picture).
Intramolecular Hydrogen Bonding in a Triangular Dithiazolyl-Azaindole for Efficient Photoreactivity in Polar and Nonpolar Solvents
作者:Sayo Fukumoto、Takuya Nakashima、Tsuyoshi Kawai
DOI:10.1002/ejoc.201100676
日期:2011.9
to a photoreactive state with C2-symmetry around the hexatriene reaction center. Temperature-dependent NMR studies and quantum chemical calculations indicated the contribution of intramolecular hydrogen-bonding between the central azaindole unit and the side thiazole units, which stabilizes the photoreactive C2-symmetric conformation and elevates the photoreactivity in both non-polar and polar solvents
Synthesis and Photochromism of Chloro- and <i>tert</i>
-Butyl-Functionalized Terarylene Derivatives for Surface Deposition
作者:Jan Patrick Dela Cruz Calupitan、Olivier Galangau、Olivier Guillermet、Roland Coratger、Takuya Nakashima、Gwénaël Rapenne、Tsuyoshi Kawai
DOI:10.1002/ejoc.201601657
日期:2017.5.3
control molecule–surface and molecule–molecule interactions to avoid molecular diffusion on the surface and to prevent the aggregation of molecules, respectively. In this context, we present the synthesis and photochromism of terarylene derivatives with tert-butyl and chloride groups. We show that these groups preserve the photochemical and switching properties of the molecules. DFT calculations on