Unusual ruthenium hydride complexes supported by the [N(2-PPh _2-4-Me-C_6H_3)_2] pincer ligand

摘要

Complexes of Ru(II) containing the pincer ligand [-N(2-PPh _2-4-Me-C_6H_3)_2] (PNP~(Ph)) were prepared. The complex (PNPPh_H)RuCl_2 (1) was treated with 2 equiv AgOTf to produce the triflate complex (PNP~(Ph)H)Ru(OTf) _2 (2). Complex 1 was also treated with an excess of NaBH_4 to give a bimetallic complex [(PNPPh)RuH_3]_2 (3). A number of methods, including X-ray crystallography, NMR spectroscopy, and computational studies, were used to probe the structure of 3. Addition of Lewis bases to 3 resulted in octahedral complexes containing a hydride ligand trans to a dihydrogen ligand.