The most stable of thymine-metal-thymine complexes and their geometries were determined. Method was used density functional theory, B3LYP. The calculations of systems containing C, H, N, O were described by the standard 6–311++G(d,p) basis set and for transition metals standard LANL2DZ basis set were used. E gap energy values of complexes were calculated by Chemissian program. Metal-mediated thymine base pair complexes which will used as nanowires in nanotechnology were predicted. In nanoworld, this study is expected to be shown the way for future practical applications.