Di-µ(2)-chlorido-bis-[chlorido(η-hexa-methyl-benzene)ruthenium(II)].

Dimeric mol-ecules of the title compound, [Ru(2)Cl(4)(C(12)H(18))(2)], are located on a crystallographic centre of inversion with one mol-ecule in the asymmetric unit. The hexa-methyl-benzene rings are in an η(6)-coordination to the ruthenium centres, which are bridged by two chloride ligands. In addition, the ruthenium centres are bonded to another chloride ligand. The aromatic rings and the Ru(2)Cl(2) four-membered ring enclose a dihedral angle of 55.85 (6)°.

Di-µ(2)-bromido-bis-[bromido(η-1,2,4,5-tetra-methyl-benzene)ruthenium(II)].

The asymmetric unit of the title compound, [Ru(2)Br(4)(C(10)H(14))(2)], contains one half of the centrosymmetric mol-ecule. Each Ru center is coordinated by tetra-methyl-benzene ring in a η(6)-coordination mode, and one terminal and two bridging bromine atoms. The aromatic rings and the Ru(2)Br(2) four-membered ring form a dihedral angle of 55.99 (8)°. In the crystal structure, weak inter-molecular C-H⋯Br inter-actions link mol-ecules into chains propagated in [001].