Ru-Gd complexes have been recognized as promising candidates for bimodal imaging probes, thanks to their unique photophysical and physicochemical properties. The bimodal nature of Ru-Gd complexes makes them ideal for both magnetic resonance imaging (MRI) and optical imaging. The complexes have a coordination number that allows for the attachment of ligands, which can be modified to improve their optical properties. Additionally, the presence of gadolinium makes the complexes efficient contrast agents for MRI. Author conducted photophysical, relaxometry, and in vitro fluorescence studies of di- and trinuclear Ru-Gd complexes. They synthesized the complexes through chemical synthesis and analyzed their physicochemical properties using various techniques, including nuclear magnetic resonance and luminescence spectroscopy. They found that these complexes exhibit excellent relaxation enhancement and paramagnetism, making them ideal for contrast-enhanced imaging. Author's work highlights the importance of understanding the coordination chemistry of Ru-Gd complexes to enhance their performance as imaging probes. The modifications made to the complex chemical structures can greatly affect their optical properties and relaxation enhancement capabilities. The use of Ru-Gd complexes as bimodal imaging probes offers a unique advantage over other contrast agents, as they allow for multimodal imaging and can be tailored for specific therapeutic applications. In conclusion, the authors work has shed light on their potential for biomedical applications. The combination of MRI and optical imaging capabilities, along with their excellent physicochemical properties, make them promising candidates for use in diagnostic and therapeutic settings.