原位 DLS/EPR/GC-MS 监测基于六氯化钨和有机铝化合物的烯烃 Metathesis 反应催化体系

IF 0.7 4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY Theoretical and Experimental Chemistry Pub Date : 2024-03-19 DOI:10.1007/s11237-024-09793-w
S. N. Osmanova, S. A. Suleymanova, T. G. Zeynalova, E. H. Ismailov
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引用次数: 0

摘要

采用动态光散射(DLS)、电子顺磁共振(EPR)和气相色谱-质谱(GC-MS)方法研究了由有机铝化合物(OAC)、WCl6 和乙醇组成的催化系统成分的相互作用产物。有机自由基(g = 2,0037,ΔH = 1,7mT)和 W5+ 复合物(gz = 1,746,gy = 1,820,gx = 1,842,g1 = 1,9957,g2 = 1,9540,g3 = 1,9465(77 K 时),g0 = 1.9583(300 K 时))的附加超频结构来自两个氯核 35,37 Cl,已通过 EPR 方法确定。这种化合物的形成伴随着乙烷和乙烯的释放。研究表明,基于 Cl6/Et3Al (Et2AlCl)/EtOH 的烯烃复分解催化体系在各组分相互作用的初始阶段是一种胶体溶液。OAC 的进一步作用导致分子溶液的形成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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In Situ DLS/EPR/GC-MS Monitoring of the Catalytic Systems Based on Tungsten(VI) Hexachloride and Organo-Aluminum Compounds for Olefin Metathesis Reactions

Dynamic light scattering (DLS), electron paramagnetic resonance (EPR), and gas chromatography-mass spectrometry (GC-MS) methods were used to study interaction products of catalytic system components consisting of organoaluminum compounds (OAC), WCl6, and ethyl alcohol. Organic radicals (g = 2,0037, ∆H = 1,7mT) and W5+ complexes (gz = 1,746, gy = 1,820, gx = 1,842, g1 = 1,9957, g2 = 1,9540, g3 = 1,9465 at 77 K, and g0 = 1.9583 at 300 K) with an additional hyperfine structure from two chlorine nuclei 35,37 Cl have been identified by the EPR method. The formation of such compounds is accompanied by ethane and ethylene release. It is shown that a Cl6/Et3Al (Et2AlCl)/EtOH-based catalytic system of olefin metathesis is a colloidal solution at the initial stages of the interaction of components. The further action of OAC leads to the formation of a molecular solution.

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来源期刊
Theoretical and Experimental Chemistry
Theoretical and Experimental Chemistry CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
1.60
自引率
10.00%
发文量
30
审稿时长
6-12 weeks
期刊介绍: Theoretical and Experimental Chemistry is a journal for the rapid publication of research communications and reviews on modern problems of physical chemistry such as: a) physicochemical bases, principles, and methods for creation of novel processes, compounds, and materials; b) physicochemical principles of chemical process control, influence of external physical forces on chemical reactions; c) physical nanochemistry, nanostructures and nanomaterials, functional nanomaterials, size-dependent properties of materials.
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