Results of density functional theory computations of infrared (IR) spectra of linear sandwich V(n)Bz(n+1), n = 1 -6, complexes are presented. It is shown that the systematic changes in the spectra as a function of the complex size can be categorized and understood in terms of responses of the "parent" modes of the Bz molecule and the VBz complex. The analysis presented should be applicable to a broad class of linear sandwich systems.