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RuSe(CO)3 crystallizes in the cubic I-43m space group. The structure is zero-dimensional and consists of twenty-four formaldehyde molecules and two RuSe clusters. In each RuSe cluster, Ru4+ is bonded in a 6-coordinate geometry to three equivalent Se2- atoms. All Ru–Se bond lengths are 2.61 Å. Se2- is bonded in a 3-coordinate geometry to three equivalent Ru4+ atoms.
Ru3Se2(CO)9 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of eighteen formaldehyde molecules and two Ru3Se2 clusters. In each Ru3Se2 cluster, there are three inequivalent Ru+3.33+ sites. In the first Ru+3.33+ site, Ru+3.33+ is bonded in a 5-coordinate geometry to two Se2- atoms. There are one shorter (2.55 Å) and one longer (2.56 Å) Ru–Se bond lengths. In the second Ru+3.33+ site, Ru+3.33+ is bonded in a 5-coordinate geometry to two Se2- atoms. There are one shorter (2.52 Å) and one longer (2.53 Å) Ru–Se bond lengths. In the third Ru+3.33+ site, Ru+3.33+ is bonded in a 5-coordinate geometry to two Se2- atoms. There are one shorter (2.51 Å) and one longer (2.53 Å) Ru–Se bond lengths. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 4-coordinate geometry to three Ru+3.33+ atoms. In the second Se2- site, Se2- is bonded in a 3-coordinate geometry to three Ru+3.33+ atoms.