The results of investigations of polymorphism and mesomorphic states of fluorinated derivatives of alkylcyclohexanecaroxylic acids nFACHCA (where n is the number of carbon atoms in the fluoroalkil radicals) and new results for n=4, 7 have been discussed. The methods of vibrational spectroscopy (experimental, theoretical modeling) have been used. The samples have been investigated in the 290-500 K temperature range, The spectra have been recoded in the range of 33-4000 cm(-1). The frequencies of normal modes and intensities of bonds of IR spectra have been calculated for conformers of H-complexes with various orientations of fluoroalkyl radical and carboxylic group relative to the rest part of the molecular complex. The polymorphism of the nFACHCA is conformational. The influence of H-bonds on dynamic of II-complex, polymorphic crystalline modification and mesophase formation were determined. The transitions solid crystal- liquid crystal-isotropic liquid and solution are accompanied by H-bonds system reconstruction: the dimmers, associates, chain associates and monomers have been appeared.