Understanding how coordinated metal ions regulate electronic structure is crucial for the rational design of functional optoelectronic materials. In this study, we investigate the role of metal identity in controlling the optoelectronic properties of two coupled metal centres incorporating Co, Cu, Fe, Ni, Pt, Ru, and Zn within a unified coordination framework. Density functional theory (DFT) were performed using the B3LYP functional with the LanL2DZ basis set to elucidate structure–property relationships. The results reveal that substitution of the coordinated metal centre enables systematic tuning of the frontier molecular orbitals, leading to significant modulation of the HOMO–LUMO energy gap. Time-dependent TD-DFT calculations of the UV spectra indicate that all complexes exhibit absorption bands spanning the visible to near-infrared regions, highlighting their potential applicability in light-harvesting and photonic devices. Thermodynamic analysis shows that all complexes possess negative interaction energies and Gibbs free energies, confirming spontaneous formation and thermodynamic favorability, with the Pt atom-containing complex displaying the highest stability among the series. The findings demonstrate that the coordinated metal ion plays a decisive role in governing both the electronic structure and stability of dinuclear complexes. This work provides theoretical design guidelines for tailoring optoelectronic properties through strategic metal selection in coupled metal-centre systems.