Alkynylpyrenes as Improved Pyrene-Based Biomolecular Probes with the Advantages of High Fluorescence Quantum Yields and Long Absorption/Emission Wavelengths
a new class of pyrene-based biomolecular probes. The absorption maxima of the alkynylpyrenes were seen to be shifted to longer wavelengths compared with those of the unsubstituted parent pyrene. Fluorescencequantumyields of the alkynylpyrenes dramatically increased up to 0.99 in ethanol, and only slight quenching of the fluorescence occurred even under aerated conditions. The alkynylpyrenes have
The process of preparing a tertiary amine by the condensation of a mono- or di-tertiary amine and a mono- or di-iodoaryl compound. Conducting the condensation reaction in the presence of potassium hydroxide, and a copper catalyst, either in the absence of a solvent or with an inert saturated hydrocarbon solvent, in an inert atmosphere, at a temperature between from about 120.degree. C. to about 190.degree. C. for a period of time sufficient to at least substantially complete the reaction.
gave a doubly alkynylpyrene‐threaded [4]rotaxane. The rotaxane showed only excimer emission, with a high fluorescence quantum yield of Φf=0.37, arising from the spatiallyrestrictedexcimer within the cavity of the γ‐CD. The excimer emission suffered little from self‐quenching up to a concentration of 1.5×10−5 M and was circularlypolarized with a high glum value of −1.5×10−2. The strongcircularly polarized
Chromium–pyrenylcarbenes accessible from halopyrene precursors undergo benzannulation upon gentle warming with 3-hexyne to give hydroquinoid benzopyrene–Cr(CO)3 complexes. Kinetic benzannulation product 3 rearranges into thermodynamic haptotropomer 4 at 70 °C in octafluorotoluene under first-order kinetics. Further complexation of 3 by Cr(NH3)3(CO)3 affords syn and anti dinuclear chromium–benzopyrene complexes
可从卤代芘前体获得的铬-芘卡宾在用 3-己炔温和加热后发生苯并环化,得到氢醌苯并芘-Cr(CO)3 配合物。动力学苯并环化产物 3 在 70 °C 下在八氟甲苯中以一级动力学重排成热力学触变体 4。3 与 Cr(NH3)3(CO)3 的进一步络合得到顺式和反双核铬-苯并芘配合物。benzannulation 协议的双向扩展导致形成顺式和反二苯并芘-二铬配合物,其结构特征通过 X 射线分析。