Paramagnetic (Benzyl)chromium Complexes as Homogeneous Ethylene Polymerization Catalysts

Quinolyl-functionalised Cp–chromium polymerisation catalysts: synthesis and crystal structures of alkylation products

“…By this route, the unprecedented dinuclear compound 6 was isolated and structurally identified. These investigations are Table 1 Selected bond lengths (Å ) and bond angles (8) (1) 2.306(1) C(1) Á/C(2) 1.417(4) Cr(1) Á/C (19) 2.119(3) C(1) Á/C(9) 1.381(4) Cr(1) Á/C (10) 2.201(3) C(9) Á/C(8) 1.402(5) Cr(1) Á/C (11) 2.256(3) C(8) Á/C (7) 1.351(5) Cr(1) Á/C (12) 2.279(3) C(7) Á/C(6) 1.427(4) Cr(1) Á/C (13) 2.277(3) C(6) Á/C(2) 1.414(4) Cr(1) Á/C (14) 2.211(3) C(6) Á/C (5) 1.409(5) C(10) Á/C (11) 1.418(4) C(5) Á/C(4) 1.357(5) C(11) Á/C (12) 1.415(4) C(4) Á/C(3) 1.404(4) C(12) Á/C (13) 1.419 (4) 94.9(1) C(2) Á/N(1) Á/C(3) 117.7(2) C(2) Á/C(1) Á/C (9) 118.9(3) C(1) Á/C(10) Á/C (11) 124.5(2) C(2) Á/C(1) Á/C (10) 116.8(2) C(1) Á/C(10) Á/C (14) 125. 5(2) C(9) Á/C(1) Á/C (10) 124.3(3) C(11) Á/C(10) Á/C (14) 108.7(2) Cr(1) Á/C(19) Á/C (20) 113.6(2) (1) 2.308(2) C(1) Á/C(2) 1.413 (7) Cr(1) Á/Cl (2) 2.309(2) C(1) Á/C(9) 1.359 (7) Cr(1) Á/C (10) 2.165(5) C(9) Á/C(8) 1.410(8) Cr(1) Á/C (11) 2.203(5) C(8) Á/C (7) 1.368(8) Cr(1) Á/C (12) 2.272(5) C(7) Á/C(6) 1.402 (7) Cr(1) Á/C (13) 2.273(5) C(6) Á/C(2) 1.417 (7) Cr(1) Á/C (14) 2.214(5) C(6) Á/C (5) 1.410(7) C(10) Á/C (11) 1.429 (7) C(5) Á/C(4) 1.356(8) C(11) Á/C (12) 1.426 (7) C(4) Á/C(3) 1.424(7) C(12) Á/C (13) 1.401 (7) C(3) Á/N(1) 1.343(6) C(13) Á/C (14) 1.440 …”

“…The Cr Á/N distances lie in the expected range with 2.111 Å (4) and 2.154 Å (5) [4c,5]. The distance between the metal atom and C19 in 4 (2.119 Å ) is characteristic of carbon Á/chromium s-bonds [4c, 12,13]. In 4 as well as in 5 the almost planar quinoline ring (max.…”

Chromium(III) complexes ligated by 2-(1-isopropyl-2-benzimidazolyl)-6-(1-(arylimino)ethyl)pyridines: Synthesis, characterization and their ethylene oligomerization and polymerization

“…IR (KBr; cm À1 ): 2968, 1588 (m C@N ), 1469, 1408, 1374, 1336, 1280, 1163, 1134, 1038 Cl 3 CrN 4 (568.9): C, 57.00; H, 5.32;N,9.85. Found: C,57.69;H,5.28;N,9.86%.…”

“…IR (KBr; cm À1 ): 2970, 1589 (m C@N ), 1564, 1504, 1472, 1409, 1382, 1338, 1280, 1218, 1162, 1133, 1038 Cl 3 CrN 4 (597.0): C, 58. 35;H,5.74;N,9.39. Found: C,58.30;H,5.58;N,9.30%.…”

Synthesis and structural characterization of chromium(III) complexes bearing 3,5-dimethylpyrazolate ligand

“…In order to understand the mechanism and the nature of the catalyst, several homogeneous chromium(III) model catalysts have been developed using the chloride bridged dimer complex[Cp ⁄ CrCl 2 ] 2 [4] by Theopold and co-workers [5]. For example, it can be alkylated and becomes the catalyst for ethylene oligomerization [6] and polymerization reactions [7]. Besides, several novel organometallic complexes have been synthesized from [Cp ⁄ CrCl 2 ] 2 [8].…”