The infra-red (IR) spectroscopic data for a series of 15 mixed [tetrakis(4-chlorophenyl)porphyrinato](phthalocyaninato) rare earth
double-
decker complexes with tervalent rare earths M
III(TClPP)(Pc) (M = Y, La, …, Lu except Ce and Pm) and intermediate-valent cerium Ce(TClPP)(Pc) have been collected with resolution of 2 cm
−1. For M
III(TClPP)(Pc), typical IR marker band of the monoradical anion Pc
− shows the most intense absorption band whose frequency linearly varies in the range from 1311 cm
−1 for La(TClPP)(Pc) to 1320 cm
−1 for Lu(TClPP)(Pc) along with the decrease of rare earth ionic size. The peaks at 1016–1023 cm
−1 are assigned to C
![single bond](http://www.sciencedirect.com/scidirimg/entities/glyph_sbnd.gif)
Cl stretchings. For Ce(TClPP)(Pc), a medium band at 1329 cm
−1 with contribution from pyrrole stretching was the marker IR band of phthalocyanine dianion Pc
2−. The TClPP
− IR marker band at ca. 1270–1300 cm
−1 was not observed for these compounds. These facts indicate that the hole in these
double-
deckers is mainly localized at the phthalocyanine ring.