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The1H MAS spectra were recorded on a Bruker AVANCE III 400 WB spectrometer equipped with a 4 mm standard bore CP MAS probehead whose channel was tuned to 400.18 MHz, using a magnetic field of 9.39T at 297 K. The dried and finely powdered samples were packed in the ZrO2 rotor closed with Kel-F cap which were spun at 12 kHz rate. The experiments were conducted at a contact time of 2 ms. A total of 16 scans were recorded with 5 s recycle delay for each sample. All 1H MAS chemical shifts are referenced to the resonances of adamantane (C10H16) standard (d=1.91).

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