Bis(dimethyl sulfoxide-S)tetrakis(mu-p-hydroxybenzoato-O : O ' O)dirhodium(II)-tetrakis(mu-butyrato-O : O ')bis(dimethyl sulfoxide-S)dirhodium(II) cocrystal ethanol disolvate

The title structure, [Rh-2(C7H5O3)(4)(C2H6OS)(2)]. [Rh-2(C4H7O2)(4)(C2H6OS) (2)]. 2C(2)H(6)O, contains two discrete neutral Rh- Rh dimers cocrystallize d as the ethanol disolvate. Each dimer is situated on an inversion center. The butyrate chain displays disorder in one C-atom position. In each dimer, the dimethyl sulfoxide ligand (dmso) is bound via S, as expected. The etha nol is a hydrogen-bond acceptor for one p-hydroxybenzoate hydroxyl group an d acts as a hydrogen-bond donor to the dmso O atom of a neighboring p-hydro xybenzoate dirhodium complex. A third hydrogen bond is formed from the othe r p-hydroxybenzoate hydroxyl group to the dmso O atom of a butyrate-dirhodi um complex.