The variation of ~1H NMR shifts of monophthalocyaninatolanthanide(Ⅲ)compoundsof nine rare earth elements from Sm~(3+)to Lu~(3+)(except Gd~(3+))was studied.It was found that a“triadeffect”appears in the sign alteration of the induced chemical shifts of α,β protons in the phthalo-cyanine rings for the second half of the rare earth series,that is,~1H NMR spectra shift upfield forTb~(3+),Dy~(3+)and Ho~(3+)compounds,while for Er~(3+),Tm~(3+)and Yb~(3+)the spectra shift downfield.Thelargest alteration of the chemical shifts appears in the compound with Tb~(3+).This is in agreementwith the regularity obtained theoretically by Bleaney.The ~(13)C NMR spectra of several monophthalocyaninatolanthanide compounds have also beenrecorded.The variation of the chemical shifts was discussed. The variation of ~ 1 H NMR shifts of monophthalocyaninatolanthanide (Ⅲ) compounds of nine rare earth elements from Sm ~ (3+) to Lu ~ (3 +) (except Gd ~ (3 +)) was studied.It was found that a “triadeffect ”Appears in the sign alteration of the induced chemical shifts of α, β protons in the phthalo-cyanine rings for the second half of the rare earth series, that is, 1H NMR spectra shift upfield for Tb ~ (3 +), Dy ~ (3+) and Ho ~ (3+) compounds, while for Er ~ (3 +), Tm ~ (3+) and Yb ~ (3+) the spectra shift downfield.Thelargest alteration of the chemical shifts appears in the compound with Tb ~ (3 +). This is in agreement with the regularity obtained theoretically by Bleaney.The ~ (13) C NMR spectra of several monophthalocyaninatolanthanide compounds have also beenrecorded. The variation of the chemical shifts was discussed.