Temperature and hydration dependence of proton MAS NMR spectra in MCM-41: Model based on motion induced chemical shift averaging

► 1H MAS NMR results in MCM-41 exhibit complex resonance peak structures. ► The peak structures redistribute significantly with increasing hydration. ► A model based on motion induced chemical shift averaging is proposed. ► Such averaging occurs as water selectively visits different hydration configurations. ► The model successfully simulates low hydration spectra without chemical exchange.