  To identify an analytical relation between the properties of polymers and
their's monomer a Metal-Molecule-Metal (MMM) junction has been presented as an
interesting and widely used object of research in which the molecule is a
polymer which is able to conduct charge. The method used in this study is based
on the Green's function approach in the tight-binding approximation using basic
properties of matrices. For a polymer base MMM system, transmission, density of
states (DOS) and local density of states (LDOS) have been calculated as a
function of the hamiltonian of the monomer. After that, we have obtained a
frequency for LDOS variations in pass from a subunit to the next one which is a
function of energy.
