Crystal stabiliy and optical properties of organic chain compounds (CROSBI ID 83177)
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Podaci o odgovornosti
Županović, Paško ; Bjeliš, Aleksa ; Barišić, Slaven
engleski
Crystal stabiliy and optical properties of organic chain compounds
The solution to the long standing problem of the cohesion of organic chain compounds is proposed. We consider the tight-binding dielectric matrix with two electronic bands per chain, determine the corresponding hybridized collective modes, and show that three among them are considerably softened due to strong dipole-dipole and monopole-dipole interactions. By this we explain the unusual low frequency optical activity of TTF-TCNQ, including the observed 10meV anomaly. The softening of the modes also explains the cohesion of the mixed-stack lattice, the fractional charge transfer almost independent of the material, and the formation of the charged sheets in some compounds.
organic compounds; cohesive energy; molecular polarizability;infrared spectra; collective resonances
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