XAS OF RUTHENIUM PHTHALOCYANINE DIMER - STRUCTURAL-PROPERTIES OF BULKAND FILM FORM

We measured in absorption mode at the Ruthenium K-edge, Ru-Ru and Ru-N distances, in structurally known systems: the Ruthenium dimeric precu rsor compound, already structurally characterized, the monomeric speci es of Ruthenium phthalocyanine (adduct) and the polymeric species of R uthenium phthalocyanine (with bridging oxygen). The film, a candidate for sensor and electrochromic applications, is loaded by sublimation a nd has been measured in fluorescence straight on the growth substrate (glass) obtaining excellent data. In the Fourier transforms obtained f or the dimer, a Ru-Ru bond is well defined. For the monomer no Ru-Ru d istance is present within the fit of the first neighbours while the po lymeric species shows a well defined peak, at ca. 3.38 Angstrom, due t o the moiety Ru-O-Ru, absent in the other two cases. In the dim case n o evidence is present for a Ru-O-Ru bond, while it is evident that a R u-Ru bond at 2.35 Angstrom,is present at the same distance as in the d imer. Good fit of the film data are indeed obtained by imposing the di mer parameters in perfect agreement within the first two shells.