环[N]碳,仅由N个碳原子组成的分子环,以前曾在气相和低温下在表面上进行过研究,但它们通常被认为过于活跃,无法在环境实验室条件下进行研究。
研究组报道了一个环[48]碳链烷的合成,其中C48环通过螺纹穿过其他三个大环来保护。该环[48]碳[4]链烷在室温溶液中具有足够的稳定性,可以进行光谱表征。它的质谱显示了预期的分子离子;它的13C核磁共振谱给出了所有48个sp1碳原子在百万分之72.9的单一共振;它的拉曼光谱在1890逆厘米处显示出一个强烈的峰值,类似于线性聚炔。
附:英文原文
Title: Solution-phase stabilization of a cyclocarbon by catenane formation
Author: Yueze Gao, Prakhar Gupta, Igor Ronevi, Coral Mycroft, Paul J. Gates, Anthony W. Parker, Harry L. Anderson
Issue&Volume: 2025-08-14
Abstract: Cyclo[N]carbons, molecular rings consisting solely of N carbon atoms, have previously been studied in the gas phase and on surfaces at cryogenic temperatures, but they are generally considered too reactive to be studied under ambient laboratory conditions. In this study, we report the synthesis of a cyclo[48]carbon catenane, in which the C48 ring is protected by being threaded through three other macrocycles. This cyclo[48]carbon [4]catenane is stable enough for spectroscopic characterization in solution at room temperature. Its mass spectrum displays the expected molecular ions; its 13C nuclear magnetic resonance spectrum gives a single resonance for all 48 sp1 carbon atoms at 72.9 parts per million; and its Raman spectrum shows an intense peak at 1890 inverse centimeters, similar to linear polyynes.
DOI: ady6054
Source: https://www.science.org/doi/10.1126/science.ady6054
Science:《科学》,创刊于1880年。隶属于美国科学促进会,最新IF:63.714
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