Physics – Condensed Matter – Materials Science
Scientific paper
2001-01-12
Phys. Chem. Chem. Phys. 3 (2001) 1904-1910
Physics
Condensed Matter
Materials Science
LaTex (revTeX), 6 figures. Yields 10 pages postscript (including figures)
Scientific paper
10.1039/b100243k
Raman and polarized infrared spectra of the mixed stack charge transfer crystal 2-chloro-5methyl-p-phenylendiamine- -2,5-dimethyl-dicyanoquinonediimine (ClMePD-DMeDCNQI) are reported as a function of temperature. A detailed spectral interpretation allows us to gain new insight into the temperature induced neutral-ionic transition in this compound. In particular, the crossing of the neutral-ionic borderline appears to be quite different from that of the few known temperature induced neutral-ionic phase transitions. First of all, the ionicity change is continuous. Furthermore, the onset of stack dimerization precedes, rather than accompanies, the neutral-ionic crossing. The (second order) phase transition is then driven by the dimerization, but the extent of dimerization is in turn affected by the ionicity change.
Brillante Aldo
Farina Luca
Girlando Alberto
Masino Matteo
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