Abstract
In the first bis[ruthenium(II)-porphyrin]-dicarbene complex, mu-[1,4-phenylenebis(phenylmethylidene-kappaC)]bis[(ethanol-kappaO)(5,10,15,20-tetra-p-tolylporphyrinato-kappa4N)ruthenium(II)] 1,2-dichloroethane trisolvate, [Ru2(C20H14)(C48H36N4)2(C2H6O)2].3C2H4Cl2, an inversion center is located at the center of the mu-phenylene group, leading to a parallel arrangement for the pair of porphyrin ring systems. The bond lengths and angles compare favourably with literature values for ruthenium-porphyrin-monocarbene complexes; the Ru=C(carbene) bond length and the C(phenyl)-C(carbene)-C(phenylene) angle are 1.865 (3) A and 112.3 (3) degrees , respectively. The Ru(II) ion is displaced out of the C20N4 porphyrin least-squares plane (by 0.2373 A) toward the bridging ligand of the Ci-symmetry dimer. The porphyrin ring systems of the dimer thus exhibit mildly domed conformations.
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