Experimental and theoretical aspects of solid-state 33S Nuclear Magnetic Resonance (NMR) in [33S]-enriched organosulfur compounds and polymers, by using variable superconducting magnets, are presented. For 33S NMR experiments, stepwise-field-swept NMR and/or frequency-swept types in lower magnetic fields were carried out to obtain 33S NMR parameters including quadrupole coupling constants (CQ value) more than 30 MHz. For spectral simulations, the direct diagonalization method, in which the combined Zeeman and quadrupole Hamiltonian is numerically calculated to obtain probabilities for each transition, was used to obtain 33S NMR parameters. It is found that 33S NMR parameters are highly sensitive to the local molecular structures such as dihedral angles, suggesting that solid-state 33S NMR becomes one of the best methods to investigate cross-linked structures in a rubber at atomic level. Towards the detection of 33S NMR spectra of a rubber without [33S]-isotope enrichment, a high-temperature superconducting (HTS) coil, whose Q value is more than 10,000, and optomechanics NMR, in which the FID signal can be converted into a laser signal via a micro-condenser consisting of two thin films, are being developed. Effectiveness of these high-sensitivity technologies are described.

Sulfur-33 NMR of organosulfur compounds and polymers

255th National Meeting (2018)

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