The title compound, [TiCl(C₅H₅)₂(CH₃O)], is a `bent metallocene' structural type typically found in Cp₂MXY complexes. The Ti-O-C bond angle of 141.4 (3)° is significantly greater than the corresponding angle in the ethoxy analog, resulting in a shortened O-Ti bond and indicating a greater -character in the O-Ti bond of the title compound.

The title compound, [Ru(CHO₂)(C₁₀H₈N₂)(C₁₅H₁₁N₃)(CO)]PF₆ or cis-[Ru(bpy)(η²-tpy)(CO)(COOH)]PF₆ (where bpy is 2,2′-bipyridyl and tpy is 2,2′:6′,2′′-terpyridyl), has distorted octahedral geometry about the Ru atom, a bidentate terpyridyl ligand and a fully chelated bipyridyl ligand. The terminal carbonyl and carboxyl groups are cis. The Ru—C—O angle (terminal carbonyl) is distorted from linearity [173.7 (4)°] by the pendant pyridyl group of the N,N′-bound tpy ligand, which is hydrogen bonded to the hydroxyl proton of the carboxyl group.

The title compound, [Ti(C₅H₅)₂(CHO₂)₂], has a `bent metallocene' structural type typically found for Cp₂MXY complexes. The Ti-O-C bond angles are larger than in related titanocene alkoxy complexes, suggesting enhanced π-character in the Ti-O bonds of the title compound; however, the Ti-O bond lengths are longer than those in related alkoxy compounds.

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).