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Developing a new synthetic carbon fixation methodology is receiving great attention due to its relevance to the global energy and environmental issues. As a C1 source, CO2 and CO can be the promising candidate to run a sustainable carbon cycle. Many transition metal complexes have been utilized in CO2 and CO conversions because of their fundamental bond-forming character with such small molecules. The utilization of earth-abundant transition metals is recently drawing much attention due to its potential economic advantages. In Nature, an efficient catalytic transformation of both CO2 and CO occurs in an enzyme possessing a nickel containing active site. In carbon monoxide dehydrogenase/acetyl-CoA synthase (CODH/ACS), CO is generated from the reduction of CO2 by CODH, and then delivered to the active site of ACS where acetyl-CoA is catalytically generated. In both active sites of enzymes important C-O bond activation and C-C bond formation occur at a 4-coordinate nickel center. Geometry and electronic structure of each nickel center are crucial to control the reactivity of corresponding nickel-carbon species. In order to explore the transformation of CO2 and CO at a 4-coordinate metal center, we work with a series of 4-coordinate metal-CO2 (and CO) complexes supported by a PEP pincer-type ligand; E = N, P, Si. Much attention has been devoted to synthetic systems that use carbon dioxide as a potential C1 source, and also reduce CO2 to a useable carbon-based fuel, which are both promising solutions to help the global energy crisis. Biologically, carbon dioxide is reversibly converted to CO and H2O at the hetero-dinuclear site in the Ni,Fe-cluster of carbon monoxide dehydrogenase. Our research focus is to develop asymmetric bimetallic complexes utilizing anionic bridging am