The reaction of 2,3,5,6-tetra-2-pyridylpyrazine (tppz) with dichlorotetrakis(dimethyl sulfoxide)ruthenium(II) in dimethyl sulfoxide (DMSO) yielded the title centrosymmetric dinuclear complex, [Ru2Cl 4(C24H16N6)(C3H 6OS)2]·2C2H6OS·2H 2O or cis,cis-[{Ru(DMSO)Cl2}2(μ-tppz)] ·2Me2CO·2H2O. Each ruthenium ion is in a distorted octahedral coordination in which the chloro ligands are cis to each other and DMSO is coordinated through sulfur. The asymmetric unit contains half of two independent molecules.

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Journal Acta Crystallographica Section E: Structure Reports Online
Hadadzadeh, H. (Hassan), Yap, G.P.A. (Glenn P. A.), & Crutchley, R. (2006). Cis,cis-μ-2,3,5,6-Tetra-2-pyridylpyrazine-κ3N 1,N2,N6:κ3N3,N 4,N5-bis[dichloro(dimethyl sulfoxide-κS) ruthenium(II)] dihydrate acetone disolvate. Acta Crystallographica Section E: Structure Reports Online, 62(8). doi:10.1107/S1600536806028959