The first metalloporphyrin dimer linked by a bridging phenylenedicarbene ligand

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.

Platinum(II) Complexes of Curcumin Showing Photocytotoxicity in Visible Light

“…Selected crystallographic and bonding parameters are given in Tables and . The data are consistent with those of the previously reported crystal structures of β‐diketonate complexes of platinum(II) . The structure revealed the Pt II centre being in a distorted square‐planar geometry with two NH 3 ligands and a chelating monoanionic acac.…”

“…Synthesis: The complexes were synthesized by using modified methods as reported earlier , . The precursor complexes [Pt(en)Cl 2 ] and [Pt(dach)Cl 2 ] were prepared with use of reported synthetic procedures.…”