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By R. Blinc (auth.), E. Kundla, E. Lippmaa, T. Saluvere (eds.)

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Extra resources for Magnetic Resonance and Related Phenomena: Proceedings of the XXth Congress AMPERE, Tallinn, August 21–26, 1978

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Aromatic systems are chosen as an example. experimental results are strongly affected by intermolecular shielding contributions. Features characteristic of the shielding of aromatic systems emerge after taking intermolecular contributions into account. The birth of solid state high resolution proton NMR was the discovery about a decade-ago that with multiple pulse techniques it is possible to suppress strong homonuclear DO-interactions in solids while retaining all information about the magnetic shielding of nuclei /1/.

13. 14. 5. 16. 17. J. Jeener, Ampere International Summer School II, Basko Polje, 1971. P. Aue, E. E. Phys. 64, 2229 (1976). R. A. Resonance 29, 173-c1978). E. Lippmaa, M. Alla and T. Tuherm, Proc. 1':3. P. Aue, J. R. Phys. 64, 4226 (1976); K. Nagayama, K. WUthrich, P. R. Ernst, Biochem. and Biophys. Research Commun. 78, 99 (1977). L. R. Phys. 63, 5490 (1975). G. Bodenhausen, R. L. Phys. 65, 839 (1976); G. Bodenhausen, R. Freeman, R. L. Resonance 24, 291 (1976). R. Resonance 25, 383 (1977). K. L.

Exceeds 5 ppm. ; . -w8eording to Eq. 2 for PMDH, we get to our satisfaction a result which cl~ai¥y resembles in all its features ~ri for PMDA. The most shielded direction, in particular, is perpendicular to ~en~-H-bond. Is this a characteristic feature of the aromatic ring ? We cannot be sure yet. Obviously more systems must be studied before this queRtion can be settled, but it is promising that the preliminary analysis of the terephthalic acid data points in the same direction /8/. References and Footnote·s: 1.

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