Use of pyrazolyl ligands for the formation of a bimetallic cobalt–ruthenium complex

A straightforward route to Ru(pyz)2(Hpyz)4 (Hpyz = pyrazole) has been developed. This has been found to react readily with a modified Co(pyrazolylborate)Cl complex in the presence of triethylamine as an HCl acceptor to yield a bimetallic cobalt–ruthenium complex, in which the two metals are each six-coordinate, and bridged by three pyrazolyl anions. Both species have been characterized structurally, as has a modified Co(pyrazolylborate)2 complex.

Graphical abstractRu(pyz)2(Hpyz)4 has been prepared, structurally characterized, and utilized to prepare a cobalt-ruthenium complex in which both metals are bound solely to pyrazolyl or pyrazole nitrogen atoms. The bimetallic complex has also been structurally characterized, and has a Co–Ru separation of 3.666(2) Å.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Ru(pyz)2(Hpyz)4 has been synthesized and structurally characterized. ► This was used to prepare a Co–Ru complex with three bridging pyz (pyrazolyl) ligands. ► TPR studies were carried out on the supported bimetallic complex.