An extension of the cross-depolarization method: Subspectral editing in CP/MAS NMR

✍ Scribed by J.S. Hartman; J.A. Ripmeester

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 520 KB
• Volume: 168
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(90)85133-w

✦ Synopsis

A modification of the cross-depolarization method in CP/MAS NMR is described which allows simultaneous nuking of both methine and methylene carbon signals despite their different sensitivities to cross depolarization, Extension of the cross-depolarization time, partially inverting methine as well as methylene carbon signals, followed by a suitably chosen brief period of normal cross polarization ("cross repolarization"), nulls all signals arising from proton-bearing carbons in rigid-lattice environments. Since selective nulling of methylene or methine carbon signals is also possible by cross depolarization, spectral editing readily gives separate methine and methylene subspectra.