Synthesis and Characterization of Ruthenium Tris (pyrazolyl)borate Complexes Containing NN-, NS-, NNN-, and OO-Donor Co-Ligands

Abstract

The synthesis and characterization of RuTp complexes containing the chelating ligands, acetylacetonate (acac), and tetramethylethylenediamine (tmeda) is described. While with NN, N-crab, acac, and tmeda mononuclear complexes are formed, a dimeric species is obtained with NS. X-ray structures of some complexes are given. The complexes featuring NN, acac, and tmeda react readily with terminal acetylenes to give vinylidene complexes.

Tris(2-dimethylaminoethyl)amine: a simple new tripodal polyamine ligand for Group 1 metals

“…13 Only two other Me 6 TREN complexes showing a similar tridentate coordination mode have previously been crystallographically characterised: [Pd(NCS)(Me 6 TREN)][NCS] 14 and [RuTp(Me 6 TREN)] + (Tp = tris-(pyrazolyl)borate). 15 In solution, NMR data for 1 are consistent with a monomeric structure similar to that observed in the solid state, although over a wide range of temperatures, toluene-d 8 solutions of 1 exhibit only one set of proton resonances for the three arms of the Me 6 TREN ligand and one for the HMDS ligand. This observation is consistent with rapid interchange of bound and unbound arms.…”

Synthesis and structural characterization of some polypyridyl and polypyrazolyl Ru(II) complexes

“…The bond lengths and angles are within the range found for similar structures described in the literature. [48][49][50][51][55][56][57][58][59][60][61][62][63] In structures 13 and 14, the shortest Ru-N bond length is the Ru-N bond to the central pyridine ring in ttp ligand. The Ru-N bond distances in bpy ligands which are trans to the monodentate ligands (Cl or bpe) are shorter than those in the other pyridine rings in bpy ligands.…”

Reaction of Tp(PPh3)Ru(η2-O2CCHPh2) with Carbene and Vinylidene Precursors

“…Tris(pyrazolyl)borate ruthenium complexes have been well studied over the past five years . A wide variety of Tp[Ru] species containing ruthenium−carbon bonds including vinylidene, − allenylidene, , alkylidene, , and alkyl ligands have been prepared, and these compounds have proven useful for carbon−carbon bond forming reactions including alkyne−alkyne 3a,8 and alkyne−olefin 9 couplings and olefin metathesis. , Due to our ongoing research program involving the preparation of new ruthenium carbene complexes for applications in olefin metathesis, we became interested in the reactions of carbene precursors with Tp[Ru] fragments. Our group and others have reported that cyclopropene derivatives, diazo compounds, , and terminal alkynes 2,3,15 can react with transition metals to generate alkylidene and vinylidene complexes.…”