Syntheses and structural characterization of heterometallic bis(pyrazolyl)methane complexes of rhenium and platinum

The new heterometallic complex {μ-1,3,5-[CH(pz)2]3C6H3}[Re(CO)3Br][Pt(p-tolyl)2]2 has been prepared by reaction of 1 equiv. of the dimer [Pt(p-tolyl)2(μ-SEt2)]2 with the monometallic rhenium precursor {1,3,5-[CH(pz)2]3C6H3}Re(CO)3Br, where 1,3,5-[CH(pz)2]3C6H3 is the tritopic, arene-linked bis(pyrazolyl)methane ligand 1,3,5-tris[bis(1-pyrazolyl)methyl]benzene. Similarly, the heterometallic complex {μ-1,3,5-[CH(pz)2]3C6H3}[Re(CO)3Br]2[Pt(p-tolyl)2] has been made by the reaction of the dirhenium compound {μ-1,3,5-[CH(pz)2]3C6H3}[Re(CO)3Br]2 and one-half of an equivalent of [Pt(p-tolyl)2(μ-SEt2)]2. X-ray crystallographic studies of the new compounds reveal significant noncovalent interactions in their molecular and supramolecular structures.

Graphical abstractThe heterometallic complexes {μ-1,3,5-[CH(pz)2]3C6H3}[Re(CO)3Br][Pt(p-tolyl)2]2 and {μ-1,3,5-[CH(pz)2]3C6H3}[Re(CO)3Br]2[Pt(p-tolyl)2] are prepared by the sequential, selective incorporation of different metal centers using arene-linked, third-generation bis(pyrazolyl)methane ligands. In the solid state structures of both complexes the “homobimetallic” groups are oriented on opposite sides of the linking arene ring.Figure optionsDownload full-size imageDownload as PowerPoint slide