The title compound {systematic name: tricarbonyl-1κC, 2κ²C-μ-formato(2-)-1κC: 2κ²CO,O'-nitrosyl-1κN-[1(η⁵)-pentamethylcyclopentadienyl]bis(triphenylphosphine)-2κ²P-dirhenium}, [Re₂(CO₂)(NO)(C₁₀H₁₅)(C₁₈H₁₅P)₂(CO)₃], has a carbon dioxide ligand bridged between two octahedral rhenium centers. The presence of two triphenylphosphine ligands, which are trans to one another on Re(2), alters the orientation of the bridging CO₂ ligand relative to ligands bound to Re(1) in this compound as compared with the analog having a single triphenylphosphine ligand on Re(2).