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A semi-quantitative method for calculation of the LCAC's and their urea adducts vibrational spectra based on simple model Hamiltonian on the basis corresponding to excitations of fragments forming the studied system is proposed. A comparison with experimental spectra of LCAC's with different terminal groups and in different phase states is performed. It is shown that the effect of the built-in incommensurability of polymethylene chain and urea lattice in adducts must manifest itself as additional broadening of some bands in the vibrational series of polymethylene chain. The manifestation of possible resonance of "host" and "guest" vibrations has also been analyzed.

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