Crystal structure of [1,3-bis(2,4,6-trimethylphenyl)imidazolidin-2-ylidene]dichlorido{2-[1-(dimethylamino)ethyl]benzylidene}ruthenium including an unknown solvate

The title compound, [RuCl2(C21H26N2)(C11H15N)], is an example of a new generation of N,N-dialkyl metallocomplex ruthenium catalysts with an N?Ru coordination bond as part of a six-membered chelate ring. The Ru atom has an Addison ? parameter of 0.234, which indicates a geometry inter­mediate between square-based pyramidal and trigonal–bipyramidal. The complex shows the usual trans arrangement of the two chloride ligands, with Ru—Cl bond lengths of 2.3397?(8) and 2.3476?(8)?Å, and a Cl—Ru— Cl angle of 157.47?(3)°. The crystal structure features C—H...Cl, C—H...? and ?–? stacking inter­actions. The solvent mol­ecules were found to be highly disordered and their contribution to the scattering was removed with the SQUEEZE procedure in PLATON [Spek (2015). Acta Cryst. C71, 9–18], which indicated a solvent cavity of volume 1096?Å3 containing approximately 419 electrons. These solvent mol­ecules are not considered in the given chemical formula and other crystal data.