In 2022,Chen, Yan; Gao, Zhanming; Wang, Lei; Li, Jiansheng; Tang, Yutian; Liu, Chun published an article in ACS Applied Polymer Materials. The title of the article was 《Living Supramolecular Polymerization of Ultrastable Kinetic Species of Ir(III) Complexes in Aqueous Media》.COA of Formula: C6H6BrN The author mentioned the following in the article:
Living supramol. polymerization (LSP) has become a key technol. for the progress of materials science. However, under the influence of hydrophobic interaction, the precise kinetic control of LSP in aqueous media is still challenging. The authors report a strategy to realize the LSP of ultrastable kinetic species that is nearly impossible to assemble spontaneously. Due to the strong hydrophobic interaction, the kinetic species of Ir(III) complex 2 (nanoparticles, 2NP) at 90 and 95% H2O contents can exist stably for >50 days at room temperature By mixing the seeds at an 85% H2O content and the suspension of kinetic species at a 95% H2O content in equal volume, LSP can be carried out at a 90% H2O content, and multicycle LSP at a 90% H2O content can be performed successfully. This LSP strategy broadens the practicality of LSP and is implemented by structurally simple Ir(III) complexes, which provides ideas for broadening the monomer scope of LSP. Time-, temperature-, and concentration-dependent spectroscopic results show that the formation of kinetic species 2NP and thermodn. species 2NS (nanosheets) follows the isodesmic model and the cooperative (nucleation-elongation) model, resp., and 2NP are the off-pathway intermediates of 2NS. This study illustrates an ingenious and precise kinetic control on the LSP in aqueous media. The experimental part of the paper was very detailed, including the reaction process of 2-Bromo-5-methylpyridine(cas: 3510-66-5COA of Formula: C6H6BrN)
2-Bromo-5-methylpyridine(cas: 3510-66-5) 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. COA of Formula: C6H6BrN