Determination of nonprotonated aromatic carbon concentrations in coals by single pulse excitation carbon-13 NMR

Determination of the apparent ratio of q

Determination of the apparent ratio of quaternary to tertiary aromatic carbon atoms in an anthracite coal by 13C-1H dipolar dephasing n.m.r.

✍ P.DuBois Murphy; T.J. Cassady; B.C. Gerstein 📂 Article 📅 1982 🏛 Elsevier Science 🌐 English ⚖ 983 KB

13G1 H heteronuclear dipolar dephasing n.m.r. techniques allow discrimination between different chemical species contributing to the 13C n.m.r. spectra of complex hydrocarbons. Model compound studies show significantly different effective transverse relaxation constants for carboxyl and quaternary c