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31P CP‐MAS NMR spectra of a solid sample of 2 a measured at 256 K (red), 298 K (blue) and 323 K (black) with spin rates of 6 kHz (256 K and 323 K) and 10 kHz (298 K), respectively. Acquired with a recycle delay of 60 s and 4 ms contact time.
