Through-bond connectivity in solids by continuous-wave spin lock.
A simple two-dimensional correlation experiment that enables determination of through-bond connectivity in the solid state is described. The experiment is performed under fast magic angle spinning (MAS) conditions. After the initial pi/2 pulse, the magnetization develops freely under the MAS Hamiltonian. The t1-period is followed by a strong spin locking pulse used as mixing period. The dipolar coupling is averaged out by magic angle spinning, and the chemical shifts and r.f.-offsets are scaled by the applied spin locking field. Hence, for strong locking conditions, the isotropic J-coupling is the dominant interaction. The mixing Hamiltonian is thus identical to the well-known TOCSY-Hamiltonian, resulting in a net through-bond magnetization transfer. The mixing-time dependence of the exchange rates is investigated. Applications to crystalline P4S7 and MgP4O11 are shown.
Hartmann
P
P
Institut für Optik und Quantenelektronik, Friedrich-Schiller Universität Jena, Germany. p5peha@uni-jena.de
Zwanziger
J W
JW
Jäger
C
C
D017616:Magnesium Compounds / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008280:Magnetics; D010710:Phosphates / Q000032:analysis; D010758:Phosphorus / Q000032:analysis
D017616:Magnesium Compounds; D010710:Phosphates; D010758:Phosphorus; C030781:magnesium phosphate