Abstract
25Mg nuclear quadrupole resonance spectra of MgCl 26H 2O, MgBr 26H 2O, MgNO 36H 2O, and MgF 2 were obtained at 77 K by a field-cycling double-resonance technique. Corresponding nuclear quadrupole coupling constants (asymmetry parameters) are 1477 (0.20) kHz, 1004 (0.52) kHz, 1448 (0.74) kHz, and 3438 (0.28) kHz, respectively. 35Cl and 37Cl quadrupole resonaces were found at 1705 and 1355 kHz in the chloride. The NQR result and previously reported single-crystal NMR study together showed that the Y(lq zzl ⩾ |q yy| |q xx| axis of the 25Mg EFG tensor is along the crystal C axis in MgF 2, the X or Z axes cannot be assigned because of the high crystalline symmetry. 25Mg … 19F solid effect transitions were observed in MgF 2 at 77 K. A dependence of the solid effect on radio-frequency field strength is attributed to the structure of 19F… 19F dipolar interactions within a spin cluster. The 25Mg resonances were observed in MgF 2 using double resonance in the laboratory frame and the solid effect, while the 25Mg signals in the hydrates were observed by level crossing. 2H NMR of M9Cl 26D 20 at 38.4 and 76.6 MHz showed that water molecules undergo 180° flipping along the C2 axis with a correlation time of approximately 10 −6 s at 100 K.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
