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Recently the ferroelectric anomaly (Nad, Monceau, et al) followed by thecharge disproportionation (Brown, et al) have been discovered in (TMTTF)2Xcompounds. The corresponding theory of the combined Mott-Hubbard statedescribes both effects by interference of the build-in nonequivalence of bondsand the spontaneous one of sites. The state gives rise to three types ofsolitons: \pi solitons (holons) are observed via the activation energy \Deltain the conductivity $G$; noninteger \alpha solitons (the FE domain walls)provide the frequency dispersion of the ferroelectric response; combinedspin-charge solitons determine G(T) below subsequent structural transitions ofthe tetramerisation. The photoconductivity gap 2\Delta is determined bycreations of soliton - antisoliton pairs. The optical edge lies well below,given by the collective ferroelectric mode which coexists with the combinedelectron-phonon resonance and the phonon antiresonance. The chargedisproportionation and the ferroelectricity can exist hiddenly even in the Sesubfamily giving rise to the unexplained yet low frequency optical peak, theenhanced pseudogap and traces of phonons activation.Comment: small fixe

Theory of the ferroelectric phase in organic conductors: From physics of solitons to optics