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ʵÑéÌõ¼þÈçÏ£ºThe corresponding 13C resonance frequencies were 100.6 MHz. Samples were packed in a 7 mm ZrO2 rotor and spun at the magic angle (54.7o), and the spin rate was 7 kHz. 1H-13C CP/MAS NMR spectra were recorded with a contact time of 1.2 ms and a recycle delay of 2 s. The 13C chemical shift was externally referenced to the high field resonance of hexamethylbenzene at 17.17 ppm as a secondary reference.


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