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Proton CRAMPS of NH3 + groups: line broadening and molecular dynamics

1995; Royal Society of Chemistry; Volume: 91; Issue: 5 Linguagem: Inglês

10.1039/ft9959100805

1364-5455

Peter Jackson, Robin K. Harris,

Atomic and Subatomic Physics Research

Increased 1H combined rotation and multiple pulse spectroscopy (CRAMPS) linewidths for protons within NH3+ groups in the solid state have been investigated by variable-temperature experiments. Linewidth variation with temperature can be correlated with specific molecular dynamic processes. With L-[15N]-alanine, both the NH3+ and CH3 group reorientations give rise to specific broadening of the respective CRAMPS signals as the temperature is lowered. Such dynamic processes may be more important than 14N-1H quadrupolar-modified dipolar broadening in determining NH3+ proton lineshapes.