The synthesis and polymerization behavior of bimetallic pyridine diamide complexes containing transition metal (Ti, Zr)

Abstract

Titanium and zirconium complexes with a pyridine diamide ligand, [2,6‐(RNCH2)2NC5H3]2− (PDMP; R = 2,6‐dimethylphenyl) have been synthesized and their catalytic behaviors investigated for ethylene polymerization. It was found that the zirconium complexes, [PDMP]ZrCl2 (7) and [PDMP][ZrCl3 × THF]2 (8), gave higher activities than the titanium complexes, [PDMP]TiCl2 (5) and [PDMP][TiCl3]2 (6). The bimetallic complexes (6, 8) gave higher activities than the corresponding monometallic complexes (5, 7). The titanium complexes gave polymers with higher molecular weight (Mw) than the zirconium complexes. The molecular weight distribution (Mw/Mn) of the polymers obtained from the pyridine diamide complexes were much broader than that of the normal metallocene catalysts. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3756–3762, 1999

Reactions of Aromatic N-Heterocycles with Yttrium and Lutetium Benzyl Complexes Supported by a Pyridine-Diamide Ligand

“…( and, thus, mimics the coordination of the ferrocene-diamide ligand. Complexes of Ti(IV), [25][26][27] Zr(IV), [28][29][30][31] Ta(V), 32,33 lanthanides, [34][35][36] and Th(IV) 37,38 supported by pyridinediamide ligands have been known. Herein we report the synthesis of yttrium and lutetium benzyl complexes bearing NN py and their reactivity toward aromatic N-heterocycles.…”

In situ generation of uranium alkyl complexes

“…10 In order to probe whether the reactivity of 1 fc -U(CH 2 Ph) 2 is unique, 21 we decided to synthesize analogous dibenzyl complexes of a tridentate, dianionic supporting ligand, 2,6bis(2,6-diisopropylanilidomethyl)pyridine (NN py , Chart 1), because its geometry mimics that of NN fc . Complexes of Ti(IV), [22][23][24] Zr(IV), [25][26][27][28] Ta(V), 29,30 and lanthanides [31][32][33] supported by pyridine-diamide ligands are known.…”

Analysis and design of InAs nanowire array based ultra broadband perfect absorber

“…Guided modes are characterized by their azimuthal mode number (m) and radial mode number (n) and for normal incidence only hybrid TM-like HE 1n modes are effectively excited in the NW due to the symmetry of the incident light. 36,45 Assuming that the real part of the propagation constant of the mode along NW axial direction approaches zero, the resonant wavelength can be approximated by 42,43,56…”

“…In addition, optical absorption wavelength range for InAs is large due to its lower bandgap. Researchers have worked on GaAs, [32][33][34][35] silicon, [36][37][38] and InP 25,28,[39][40][41][42][43][44][45] NW based solar absorbers but the work on ultra broadband light absorption using InAs NWs is very few. Wu et al 46 investigated the dependence of optical response on the InAs NW geometry and Rahman et al 41 reported wavelength selective absorption in InAs NWs.…”