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The  127 NQR spectra of cesium enneaiododimetallates Cs 3 M 2 I 9 , M = Dy, Ho, Er, Yb, Y and Tb, Sm, Nd, Pr have been studied as a function of temperature. The compounds are characterized by X-ray powder diffraction, too. The first group of compounds, M = Dy • • • Y, belongs to the family of Cs 3 Cr 2 Cl 9 -type enneahalogenodimetallates (III). The crystal structure of the second group, M = Tb ...Pr , is less symmetric, as in the  127 I NQR the presence of two crystallographically independent iodines shows up. Nuclear quadrupole coupling constants for the terminal and bridging halogens have been calculated from the NQR frequencies. The dependence of the NQR frequencies and of the crystal structure from the radius of the RE3⊕ -ion is discussed. The NQR spectra reveal phase transitions of the investigated enneaiododimetallates (III), for which Tlr also depends on r(RE3⊕). Positive temperature coefficients of the  127 I have been found and the influence of π-bond character is considered.

Cesium Iodometallates(III), Cs 3 M 2 I 9 , with M = Rare Earth. A Structural Investigation by 127 I NQR