Solid-state chemical-shift referencing with adamantane

The C-13 signals of adamantane are used as a chemical shift standard for solid-state NMR. Its chemical shifts are measured to greater accuracy than previously reported and over a temperature range from-2 to 70 degrees C. Combining the chemical shifts of adamantane's two NMR signals gives an accurate chemical shift over the whole temperature range without need for measuring the temperature directly. The difference between the chemical shifts gives the approximate temperature. The chemical shift of the adamantane CH signal at 25 degrees C is 37.777, sigma = 0.003 ppm. (C) 2022 Elsevier Inc. All rights reserved.

Automated summary

The C-13 signals of adamantane serve as a chemical shift standard in solid-state NMR. The chemical shifts are measured with higher accuracy than previous reports and across a temperature range from -2 to 70 degrees C. By combining the chemical shifts of adamantane's NMR signals, an accurate chemical shift can be obtained without directly measuring the temperature.