MAS NMR machine, 400 MHz WB

• Subject Area: Molecular Chemistry
• Term: Funded in 2023
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 523962358

The department of chemistry of the Humboldt-Universität zu Berlin requires a solid-state NMR device for measuring solid-state compounds. This is a replacement purchase of a very well utilised device, which, however, is now 35 (magnet) and 20 (console) years old. Repairs by the manufacturer can no longer be guaranteed. Both the personnel equipment and the experience in the field of solid-state NMR spectroscopy are existing. Due to the age of the magnet, it has not been possible to connect it to the helium recovery system, i.e. a new device would also save running costs considerably. The device is needed by a number of research groups that deal with scientific topics requiring MAS-NMR measurements. The device will also be used within the framework of research networks by the working groups listed in the application. By far the most frequent experiments involve 1H and 19F NMR measurements, which is why a new probe head for these measurements is part of the application. The old sample head was procured 17 years ago and requires increased maintenance and repairs. Depending on the field of application, a wide range of nuclei (mainly: 13C, 19F, 7Li, 27Al, 17O, 31P, 15N, 29Si, 89Y, 119Sn, 125Te,11B, 2H) are also measured. Magnetisation transfer experiments from 1H or 19F to insensitive 13C nuclei play a major role. For these experiments, a high concentration and magnetisation transfer from more sensitive nuclei such as 1H, 19F is crucial. Additional decoupling on a third channel is not necessary, which is why a 2-channel spectrometer is sufficient.

• DFG Programme: Major Research Instrumentation
• Major Instrumentation: MAS-NMR-Gerät, 400 MHz WB
• Instrumentation Group: 1740 Hochauflösende NMR-Spektrometer
• Applicant Institution: Humboldt-Universität zu Berlin
• Leader: Professor Dr. Thomas Braun