Three ligands, 1,2-bis(3,5-dimethylpyrazol-1-ylmethyl)benzene (L1), 1,3-bis(3,5-dimethylpyrazol-1-ylmethyl)benzene (L2) and 1,4-bis(3,5-dimethylpyrazol-1-ylmethyl)benzene (L3), were reacted with either nickel(II) chloride or bromide to produce four nickel complexes, Ni(L1)Br2 (1), Ni(L1)Cl2 (2), Ni(L2)Br2 (3), (4). The complexes mononuclear, 1 2, polymeric, 3 4, depending on the positions of pyrazolyl units benzene linker in ligand. This was established from crystal structures 1, 2 3. All...

The reaction of 2-{[2-(1H-imidazol-4-yl)-ethylimino]-methyl}-phenol (L1), 2,4-di-tert-butyl-6-{[2-(1H-imidazol-4-yl)-ethylimino]-methyl}-phenol (L2) or 4-tert-butyl-2-{[2-(1H-imidazol-4-yl)-ethylimino]-methyl}-phenol (L3) with iron(ii) precursors produced either iron(iii) complexes, depending on the nature anions in precursor and ligand. When anion is chloride ligand L1, product [(L1)2Fe][FeCl4] (1), but when triflate (OTf(-)) L2, [(L2)2Fe][OTf]2 (2). With halides tert-butyl groups phenoxy...

The new compounds and potential ligands 2-(3,5-di-tert-butyl-1H-pyrazol-1-yl)ethyldiphenlyphosphinite (L1), 2-(3,5-di-tert-butyl-1H-pyrazol-1-yl)ethyldiethylphosphite (L2), 2-(3,5-di-tert-butyl-1H-pyrazol-1-yl)ethyl-diethylphosphite (L3) 2-(3,5-diphenyl-1H-pyrazol-1-yl)ethyldiethylphosphite (L4) were prepared from the reaction of (3,5-(disubstituted)pyrazol-1H-yl)ethanol appropriate phosphine chloride. phosphinite (L1) phosphites (L2-L4)...

(Ferrocenylpyrazolyl)nickel(<sc>ii</sc>) complexes upon activation with EtAlCl₂ catalyse ethylene oligomerisation reactions in chlorobenzene to isomers of butenes and C₁₆–C₆₄ olefins without Schulz–Flory distribution.

The pyrazolyl pyridylimine ligands [2-(3,5-dimethylpyrazol-1-yl)ethyl]pyridin-2-ylmethyleneimine (L1) and [2-(3,5-di-tert-butylpyrazol-1-yl)ethyl]pyridin-2-ylmethyleneimine (L2) thienylimine [2-(3,5-dimethylpyrazol-1-yl)ethyl]thiophen-2-ylmethyleneimine (L3), [2-(3,5-di-tert-butyl-pyrazol-1-yl)ethyl]thiophen-2-ylmethyleneimine (L4), [2-(3,5-dimethylpyrazol-1-yl)ethyl]-2-bromothiophen-2-ylmethyleneimine (L5), [2-(3,5-di-tert-butyl-pyrazol-1-yl)ethyl]-2-bromothiophen-2-ylmethyleneimine (L6)...

Reactions of [PdCl2(NCMe)2] with the ferrocenylpyrazolyl compounds: 3-ferrocenyl-1H-pyrazole-5-carboxylate (L1), ethyl-1-(2-bromoethyl)-3-ferrocenyl-1H-pyrazole-5-carboxylate (L2a), ethyl-1-(2-bromoethyl)-5-ferrocenyl-1H-pyrazole-3-carboxylate (L2b), 3-ferrocenylpyrazolyl-methylenepyridine (L3) and 3-ferrocenyl-5-methylpyrazolyl-methylenepyridine (L4) at room temperature afforded [PdCl2(L1)] (1), [PdCl2(L2a)] (2a), [PdCl2(L2b)] (2b), [PdCl2(L3)] (3) [PdCl2(L4)] (4) respectively. Compounds...

A series of discrete chromium(III) precatalysts, {[Cr( κ 3 ‐L1 )] ( 1a.7H 2 O ), ‐L2 2a.5H ‐L3 3a.6H ‐L4 4a.10H ‐L5 5a.4H ) and in‐situ‐generated precatalysts 1b 2b 3b 4b 5b bearing 2,4‐di‐tert‐butyl‐6‐{[2‐(1H‐imidazol‐4‐yl)‐ethylimino]‐methyl}‐phenol L1 2,4‐di‐tert‐butyl‐6‐{[2‐RR‐pyrazol‐1‐yl‐ethylimino]‐methyl}‐phenol, R = H L2 Me L3 Ph L4 2,4‐di‐tert‐butyl‐6‐{[2‐pyrid‐2‐yl‐ethylimino]‐methyl}‐phenol L5 are developed. The characterized by IR spectroscopy, elemental analysis, mass...

Pyrazolylsulphonamides compounds and their palladium complexes exhibiting good potential anti-bacterial activities.

A new class of stabilizers for gold nanoparticles has been develop with non-toxic thiocarbohydrates that were prepared from<sc>d</sc>-(+)-gluconic acid δ-lactone and aminoalkylthiols.

Palladium complexes of ferrocenylpyrazolylpyridine and ferrocenylpyrazolylamine were synthesised screened as pre-catalysts (1-4) for olefin polymerisation. The 1-4 on activation with EtAlCl2 in the presence ethylene chlorobenzene or hexane solvent highly active 1 being most active, an activity 360 kg mol Pd-1 h-1. major product from reaction was 1-butene high carbon content oligomers. molecular weight (m/z) oligomers is 623.0. When toluene used solvent, products obtained ethyltoluene...

Five new iron(III) 1-hexene polymerisation catalysts were prepared from the reactions of 2,4-di-tert-butyl-6-(2-(1H-imidazol-4-yl)ethylimino)methylphenol (L1), or 4-tert-butyl-6-(2-(1H-imidazol-4-yl)ethylimino)methylphenol (L2) 2,4-di-tert-butyl-6-[(2-pyridin-2-yl-ethylimino)-methyl-phenol (L3) with anhydrous iron(II) halides to form [FeCl2(L1)] (1), [FeBr2(L1)] (2), [FeI2(L1)] (3), [FeBr2(L2)] (4) and [FeCl2(L3)] (5). All complexes 1–5 activated EtAlCl2 produce active for low molecular...

Background: Glyco disulfide gold nanoparticles (GDAuNPs) were prepared by three methods: direct, photochemical irradiation and ligand substitution. acted as reducing capping agents of ions, to produce AuNPs GD1–GD16. Results: Shorter chains glyco disulfides (n = 1 2) offered monodispersed stable GDAuNPs in physiological pH, while longer 3) furnished unstable nanoparticles. ζ-potential study direct method revealed surface charge dependency on the alkyl unit length. Transmission electron...

Background: Antimicrobial resistance has rendered several anti-infective agents ineffective, necessitating the need to intensify efforts identify and develop novel drugs against microbial infection. Structural modification of existing antibiotics continues be one areas intense research focus in recent times. Objective: This study assessed antibacterial synergistic activity fifteen pyrazolyl sulphonamide derivatives Staphylococcus haemolyticus. Methods: Antibacterial was determined using...

Compounds (2‐(3,5‐dimethyl‐1 H ‐pyrazol‐1‐yl)ethyldiphenylphosphinite ( L1 ), 2‐(3,5‐di‐tert‐butyl‐1 L2 ) , and 2‐(3,5‐diphenyl‐1 L3 were prepared using the synthetic routes reported in literature. These compounds reacted with [NiCl 2 (DME) ] or [NiBr under appropriate reaction conditions to afford six new nickel(II) ([NiCl L1)] 1 )] 3 4 5 6 )). The pre‐catalysts catalyze oligomerization of ethylene, presence ethylaluminium dichloride as co‐catalyst, produce butenes, hexenes, octenes higher...