Three-Fold-Symmetric Selenium-Donor Metallaboratranes of Cobalt and Nickel

A novel selenium-containing pyridazinyl-based soft scorpionate ligand (KTnse) was synthesized. It reacts with CoCl2 and NiCl2, yielding the first metallaboratrane complexes with selenium in their donor positions. Further substitution with Ag­(OTf) or NaN3 allows isolation of the respective triflate or azide complexes. Reaction with Ag­(OTf) leads in the case of nickel to a dinuclear, dicationic complex with a short Ni–Ni distance, while cobalt gave a mononuclear cationic species. Substitution of the chloride by azide yields with both metals the respective azide complexes. All compounds were characterized via single-crystal X-ray diffraction analysis. Density functional theory calculations on the chloride species point to oxidized cobalt­(III) and nickel­(III) centers.