CPMAS HFX WB triple resonance probe 0.7 mm

CPMAS HFX WB 三重共振探头 0.7 mm

• 批准号: 465296153
• 金额: --
• 依托单位: Universität Bayreuth
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/465296153?language=en
• 关键词: CPMAS; HFX; WB; triple; resonance

The University of Bayreuth plans the purchase of a CPMAS HFX triple resonance probe with a rotor diameter of 0.7 mm for the 600 MHz WB solid-state NMR spectrometer (Avance III HD, Bruker) of the North Bavarian NMR centre. The responsibility for the procurement and an efficient scientific use is located in the work group of Juergen Senker (Inorganic Chemistry III). Additionally, the research groups of Seema Agarwal (Macromolecular Chemistry II) and Roland Marschall (Physical Chemistry III) expressed their interest in using the probe for their scientific research.With the purchase of the 0.7 mm MAS probe, we aim at implementing high-resolution solid-state NMR spectroscopy mainly based on protons for characterising of inorganic, organic, hybrid and polymer materials. Doing so, requires a probe able to spin fast enough to even average very strong homonuclear 1H-1H dipolar couplings effectively. Recent results suggest that these conditions become to be fulfilled beyond spinning speeds of 100 kHz. As the 0.7 mm MAS probe allows for rotation frequencies up to 110 kHz, it meets the necessary requirements. Under these conditions 1H MAS NMR spectroscopy features excellent sensitivities and allows for probing homonuclear spatial proximities up to roughly 1 nm. 1H MAS NMR experiments approach liquid-like conditions for the time dependence of NMR observables and thus enables to work with indirect detections schemes in the solid state. Besides of being able to record high-resolution 1H MAS NMR spectra, free of influences of the homonuclear dipolar coupling, and to acquire 1H-1H ZQ and DQ recoupling experiments more easily, indirect detection provides a promising alternative, for a broad range of heteronuclear correlation experiments. A successful handling of the proposed research topics, requires high-resolution proton HETCOR spectra with X nuclei like 6/7Li, 13C, 14N, 17O, 19F, 23Na, 27Al, 29Si, 69Ga, 91Zr, 113Cd and 119Sn. Some of these heteronuclei like 14N and 17O are difficult to excite directly. For the planned correlation experiments between 1H and 19F, additionally, a triple resonance setup with the possibility of simultaneously excite 1H, 19F and one further X nucleus is required.

拜罗伊特大学计划为北巴伐利亚NMR中心的600 MHz WB固态NMR光谱仪（Avance III HD，Bruker）购买转子直径为0.7 mm的CPMAS HFX三重共振探头。采购和有效的科学使用的责任由Juergen Senker（无机化学III）的工作组负责。此外，Seema Agarwal（高分子化学II）和罗兰Marschall（物理化学III）的研究小组表示有兴趣将该探针用于他们的科学研究。通过购买0.7 mm MAS探针，我们的目标是实现以质子为主要成分的高分辨率固态NMR光谱，用于表征无机、有机、混合和聚合物材料。这样做，需要探针能够足够快地旋转，甚至有效地平均非常强的homopolymer 1H-1H偶极耦合。最近的结果表明，这些条件变得满足超过100 kHz的旋转速度。由于0.7 mm MAS探头允许高达110 kHz的旋转频率，因此符合必要的要求。在这些条件下，1H MAS NMR光谱具有优异的灵敏度，并允许探测homemethical空间接近度高达约1 nm。1H MAS NMR实验接近类似液体的条件下的NMR观测值的时间依赖性，从而使间接检测方案在固态下工作。除了能够记录高分辨率的1H MAS NMR谱，不受同向偶极耦合的影响，并且更容易获得1H-1H ZQ和DQ再耦合实验之外，间接检测为广泛的异向相关实验提供了一种有希望的替代方案。成功处理所提出的研究课题，需要高分辨率的质子HETCOR谱与X核，如6/7 Li，13 C，14 N，17 O，19 F，23 Na，27 Al，29 Si，69 Ga，91 Zr，113 Cd和119 Sn。其中一些异核，如14 N和17 O，很难直接激发。此外，对于计划中的1H和19 F之间的相关实验，需要一个三重共振装置，可以同时激发1H，19 F和另一个X核。