The variations of the 1H NMR chem. shifts of the monophthalocyaninatolanthanide(III) compounds for 9 rare earth elements from Sm3+ to Lu3+ (except Gd3+) were studied. A "triad effect" appears in the sign alternation of the induced chem. shifts of the a, b-protons in the phthalocyanine rings for the 2nd half of the rare earth series. That is 1H NMR spectra are shifted upfield for Tb3+, Dy3+, and Ho3+ compounds and shifted downfield for Er3+ Tm3+, and Yb3+ compounds The largest alternation of the chem. shifts appears in the Tb3+ compound This is inconsistent with the regularity obtained theor. by B. Bleaney (1972) for the whole rare earth series. The 13O NMR spectra of several monophthalocyaninatolanthanide compounds are described and the variations of the chem. shifts discussed.

Key words: PHTHALOCYANINE P, NMR SPECTROMETRY, C13 NMR SPECTROMETRY, PROTON MAGNETIC RESONANCE SPECTROMETRY, RARE EARTH METAL COMPLEX, CHEMICAL SHIFT