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31P CSA NMR spectra for POPy2 film with (black) and without (gray) DNP enhancement: (a) vacuum-deposited on SiO2 (12 sheets), (b) drop-cast on SiO2 (15 sheets) and (c) vacuum-deposited on SiO2 (1 sheets). Reproduced with permission. [111] Copyright 2017, Angewandte Chemie, Wiley-VCH.
