《Self-Assembled Perylene Bisimide-Cored Trigonal Prism as an Electron-Deficient Host for C60 and C70 Driven by “”Like Dissolves Like””》 was written by Chang, Xingmao; Lin, Simin; Wang, Gang; Shang, Congdi; Wang, Zhaolong; Liu, Kaiqiang; Fang, Yu; Stang, Peter J.. Recommanded Product: 4-Ethynylpyridine And the article was included in Journal of the American Chemical Society in 2020. The article conveys some information:
Poor processability of fullerenes is a major remaining drawback for them to be studied monomolecularly and to find real-life applications. One of the strategies to tackle this problem is to encapsulate them within a host, which is however quite often, accompanied by significant alteration of their phys./chem. properties as encountered in chem. modification. To minimize the effect, an electron-deficient entities-based, dissolvable, and fluorescence active supramol. host was designed and constructed via coordination-driven self-assembly of o-tetrapyridyl perylene bisimide (PBI) with cis-(PEt3)2Pt(OTf)2. The trigonal prism 1 possesses a trigonal-prismatic inner cavity with 14.7 Å as the diameter of its inscribed circle. Host-guest chem. investigations revealed that both C60 and C70 could be quant. encapsulated by the host in a 1:1 ratio. Further studies demonstrated that the produced host-guest complex 1⊃C70 is significantly more stable than 1⊃C60, allowing complete transformation of the latter to the former and separation of C70 from its mixture with C60. The fullerenes in the inclusion state could rotate freely within the cavity. Electrochem. and spectroscopy studies disclosed that the encapsulation of the guests shows little effect upon the reduction of the host and its fluorescence properties. Thus, “”like dissolves like”” is believed to be the main driving force for the formation of the host-guest complexes. Moreover, the host and host-guest complexes can be fabricated into monomol. membranes using the conventional Langmuir-Blodgett technique. We propose that these unique host-guest complexes could be used as model ensembles for further studies of the phys./chem. properties of fullerenes in both single mol. and 2D membrane states. In addition, their reversible four-electron reduction property may allow them to find applications in photo/electrocatalysis, organic electronics, etc. In the experiment, the researchers used 4-Ethynylpyridine(cas: 2510-22-7Recommanded Product: 4-Ethynylpyridine)
4-Ethynylpyridine(cas: 2510-22-7) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. Recommanded Product: 4-Ethynylpyridine