Boosted molecular mobility during common chemical reactions

doi:10.1126/science.aba8425

GSTDTAP > 气候变化

DOI	10.1126/science.aba8425
	Boosted molecular mobility during common chemical reactions
	Huan Wang; Myeonggon Park; Ruoyu Dong; Junyoung Kim; Yoon-Kyoung Cho; Tsvi Tlusty; Steve Granick
	2020-07-31
发表期刊	Science
出版年	2020
英文摘要	During a chemical reaction, the reorganization of solvent molecules not directly in contact with reactants and products is normally viewed as a simple diffusion response. Wang et al. studied molecular diffusion in six common reactions—including the copper-catalyzed click reaction and the Diels-Alder reaction—with pulsed-field gradient nuclear magnetic resonance. They observed a boost in mobility relative to Brownian diffusion that was stronger for the catalyzed reactions that were studied. The mobilities for the click reaction were verified with a microfluidic gradient method. They argue that energy release produces transient translational motion of reacting centers that mechanically perturbs solvent molecules. Science , this issue p. [537][1] Mobility of reactants and nearby solvent is more rapid than Brownian diffusion during several common chemical reactions when the energy release rate exceeds a threshold. Screening a family of 15 organic chemical reactions, we demonstrate the largest boost for catalyzed bimolecular reactions, click chemistry, ring-opening metathesis polymerization, and Sonogashira coupling. Boosted diffusion is also observed but to lesser extent for the uncatalyzed Diels-Alder reaction, but not for substitution reactions SN1 and SN2 within instrumental resolution. Diffusion coefficient increases as measured by pulsed-field gradient nuclear magnetic resonance, whereas in microfluidics experiments, molecules in reaction gradients migrate “uphill” in the direction of lesser diffusivity. This microscopic consumption of energy by chemical reactions transduced into mechanical motion presents a form of active matter. [1]: /lookup/doi/10.1126/science.aba8425
领域	气候变化 ; 资源环境
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引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/286865
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Huan Wang,Myeonggon Park,Ruoyu Dong,et al. Boosted molecular mobility during common chemical reactions[J]. Science,2020.
APA	Huan Wang.,Myeonggon Park.,Ruoyu Dong.,Junyoung Kim.,Yoon-Kyoung Cho.,...&Steve Granick.(2020).Boosted molecular mobility during common chemical reactions.Science.
MLA	Huan Wang,et al."Boosted molecular mobility during common chemical reactions".Science (2020).