Synthesis, structural characterization and ethylene polymerization behavior of complex [Ph4P][CrCl3{HB(pz)3}] [HB(pz)3=hydrotris(1-pyrazolyl)borate]

Tris(pyrazolyl)methane–chromium(III) complexes as highly active catalysts for ethylene polymerization

“…The catalytic behavior and properties of the polymers are summarized in Table 1. Analysis of the data showed that these new compounds have high activities compared to other chromium complexes [11], and in particular to the related anionic hydro-tris(pyrazolyl)borate-chromium(III) complex [8].…”

“…Recently we reported the synthesis, structural characterization and activity in ethylene polymerization of the anionic chromium(III) complex [CrCl 3 {HB(Pz) 3 }] − , which shows a moderate activity and a wide molecular weight distribution associated with the presence of more than one active species [8].…”

Chromium(III) complexes with terdentate 2,6-bis(azolylmethyl)pyridine ligands: Synthesis, structures and ethylene polymerization behavior

“…The use of a substituent on the central carbon atom of the ligand has greater influence on polymerization activity than the pyrazole ring substituents [9b]. We had previously reported the synthesis and activity of the anionic complex [CrCl 3 {HB(Pz) 3 } 3 ] À , which shows moderate activity and a wide molecular weight distribution associated with the presence of more than one active species [10].…”

Cr Complexes of Nitrogen Donor Ligands for Olefin Oligomerisation and Polymerisation

“…1.7.2. A tris(pyrazolyl)borate complex, 34, has also been evaluated, but leads only to moderate activity (to 18 kg mol Cr -1 bar -1 h -1 ) after MAO activation [43]. Other researchers investigated tridenate pyrazolecontaining ligands with an N, O or S central donor, general structure 35 [44].…”