1,3‐Bis(diphenylphosphino)propane‐2κ 2 P , P ′‐{μ‐2‐[bis(2‐mercaptoethyl)amino]ethanesulfinato(3–)‐1κ 4 N , S , S ′, S ′′:2κ 2 S , S ′}chloro‐2κ Cl ‐dinitroso‐1κ 2 N ‐iron(II)nickel(II) acetonitrile hemisolvate

The title compound, [{Fe[(SO 2 CH 2 CH 2 )(SCH 2 CH 2 ) 2 N](NO) 2 ‐ S , S ′}NiCl{[P(C 6 H 5 ) 2 ] 2 (CH 2 ) 3 }]·0.5CH 3 CN or [FeNi(C 6 H 12 NO 2 S 3 )Cl(C 27 H 26 P 2 )(NO) 2 ]·0.5C 2 H 3 N, is described. There are two crystallographically distinct dimetallic complex molecules. In each molecule, the Fe atom is octahedrally coordinated, with the three S atoms and an N atom of one of the two NO ligands forming the equatorial plane; the N atoms from the second NO group and the (SO 2 CH 2 CH 2 )(SCH 2 CH 2 ) 2 N ligand lie in the axial positions. The Ni atom is square pyramidally coordinated by the two bridging S atoms and the two P atoms forming the basal plane, and by the Cl atom lying in the apical position. Slight differences in the bonding modes of the NO ligands are observed for the two distinct molecules.