Abstract
The preparation of terpyridyl chelates of heavier rare earths of the type M (Terp) (NO3)3 ·n H2O(M = Tb — Yb and n = O —3) is described. The infrared studies of the solid chelates show the coordinated nature of both terpyridyl and nitrate groups. A spectrochemical series based on the shift of the “breathing” vibration of terpyridyl in the complexes is proposed.

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