The certain of macromolecular electronic structures that fulfill specific function, such as conduction and switching , is spurred by the growing realization that the extent to which electronic components based on bulk properties ,can be miniaturized is finite and may have already been reached coordination polymers also hold promise as novel materials because of magnetic, non linear optical and conductive properties. Furthermore, molecular materials with special properties such as one or two dimensional Electronic, based on ?-conjugated molecules, are very active field today, due to the potential application in new generation of electronic, magnetic, nano-materials and photonic devices. Properties conductivity within this linked system will arise provided the polymer p? orbitals and both symmetry and energy matched. To obtain this subject as well as strong effective magnetic coupling, expansion of the ?-electron in molecular structure is of the most important and promising approaches.In this regard inorganic polymeric and metallic coordination polymeric materials hold great interest. We are attempting to construct conductive organic polymer chains that are cross-linked by phenylcyanamide groups to coordination complexes. Our extensive studies of mixed valance Polynuclear cobalt complexes incorporating the phenylcyanamide groups bridging ligands have shown that the magnitude of metal-metal coupling can be dramatically perturbed by the nature of either inner or the outer coordination. Indeed, this remarkable sensitivity of metal-metal coupling chains linked by cobalt_phynylcyanamide bonds can function as molecular switching devices. It is very interesting to can make multinuclear cobalt complexes. Co(??) complexes of phenylcyanamide derivatives has been prepared and synthesized in generally good yield and characterized by UV-vis ,FT-IR spectroscopies. These complexes included Polynuclear cobalt complexes and made with phenylcyanamide ligands like [Co-(4-floro-pcyd)], [Co-(4-choloro-pcyd)], [Co-(4-bromo-pcyd)]. A crystal structure determination of complex [Co (4-nitro-pcyd)(DMF)] has been performed. This complex has Polynuclear structure and ligands have been bridged within complex. We hope to develop the spectroscopic tools to evaluate the electronic properties of metal-pcyd linkage when they are incorporated into a conducting polymer. Crystallography: block-shaped crystals of [Co-(4-nitro-pcyd)(DMF)] were grown from a solution dimethylformamide and acetonitrile by slow evaporation of the acetonitrile.