Studies on Nickel(II)Complexes. IV. Bis-(N-sec-alkylsalicylaldimine) Complexes: Conformational Equilibria in Solution

Holm, R. H.; Swaminathan, K.

doi:10.1021/ic50005a046

Cited by 69 publications

(19 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the crystalline state, however, these chelates exhibit a striking alternation in coordination configuration as the 3-substituent is changed from hydrogen to methyl to ethyl. That is, consistent with the magnetic moments reported by Holm & Swaminathan (1963), the coordination configurations have been shown to be tetrahedral for the 3-hydrogen chelate (Fox, Orioli, Lingafelter & Sacconi, 1964), planar for the 3-methyl chelate (3-M-Ni: , and tetrahedral for the 3-ethyl chelate (3-E-Ni: Braun & Lingafelter, 1967). The molecular structure of the planar chelate 3-M-Ni has shown the steric factors which cause the tetrahedral configuration to appear for N-isopropylsalicylaldimine chelates.…”

Section: Introductionsupporting

confidence: 92%

“…It has been shown (Holm & Swaminathan, 1963) that 3-substituted bis-(N-isopropylsalicylaldiminato)nickel chelates exist in a conformational equilibrium between a planar species and a tetrahedral species in toluene solution. In the crystalline state, however, these chelates exhibit a striking alternation in coordination configuration as the 3-substituent is changed from hydrogen to methyl to ethyl.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The crystal structure of bis-(N-isopropyl-3-ethylsalicylaldiminato)palladium

Braun¹,

Lingafelter²

1967

Acta Crystallogr

View full text Add to dashboard Cite

Section: Introductionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

The crystal structure of bis-(N-isopropyl-3-ethylsalicylaldiminato)palladium

Braun¹,

Lingafelter²

1967

Acta Crystallogr

View full text Add to dashboard Cite

“…1 mmHg) and stored under dry argon in the refrigerator. Bis(salicyladiminate)nickel(II) complexes were prepared as previously reported 20, 21…”

Section: Methodsmentioning

confidence: 99%

Ethylene polymerization by bis(salicylaldiminate)nickel(II)/aluminoxane catalysts

Carlini

Macinai

Masi³

et al. 2004

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

The homopolymerization of ethylene by using different catalytic systems based on dinitro‐substituted bis(salicylaldiminate)nickel(II) precursors such as bis[3,5‐dinitro‐N(2,6‐diisopropylphenyl)]nickel(II) and bis[3,5‐dinitro‐N(phenyl)]nickel(II) in combination with organoaluminum compounds was investigated. In particular, the catalytic performances were studied as a function of the main reaction parameters, such as temperature, pressure, Al/Ni molar ratio, and duration. Methylaluminoxane resulted in the best co‐catalyst. Activities up to 200 kg polyethylene/(mol Ni × h) to give a linear high‐molecular‐weight polymer were achieved. The influence of the bulkiness of the substituents on the N‐aryl group of the aldimine ligand was also checked; it resulted in a determinant for catalytic activity rather than for polymer characteristics. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2534–2542, 2004

show abstract

“…The same procedure was repeated in the follow-up recycling. Bis-(salicylaldimine) Ni(II) complex 3 was prepared according to a previously reported one-pot synthetic route [33]. 1 mL salicylaldehyde (12.9 mmol) was allowed to react with 0.5 equimolar amount of Ni(OAc) 2 Á4H 2 O (1.60 g, 6.45 mmol) and 3 equiv.…”

Section: Recycling Experimentsmentioning

confidence: 99%

Ionic Liquid-Supported Bis-(salicylaldimine) Nickel Complexes: Robust and Recyclable Catalysts for Ethylene Oligomerization in Biphasic Solvent System

et al. 2009

View full text Add to dashboard Cite

Two new ionic liquid-supported bis-(salicylaldimine) Ni(II) complexes Ni[2-(O)C 6 H 4 CH=N(CH 2 ) 3 (methylimidazole)Br] 2 (1) and Ni[3, 5-t Bu 2 -2-(O)C 6 H 2 CH= N(CH 2 ) 3 (methylimidazole)Br] 2 (2) have been synthesized and characterized. Ethylene oligomerizations were carried out with these two complexes in biphasic solvent systems consisting of chloroaluminate ionic liquid and n-heptane or toluene under mild reaction conditions. In the presence of diethylaluminum chloride, both complexes 1 and 2 are highly active for ethylene oligomerization. The olefinic products can be easily separated from the catalytic ionic liquid phase by simple decantation, and the nickel catalysts can be reused in successive ethylene oligomerization cycles. GC-MS analyzes showed that the obtained oligomers contained mainly C4, C6, and C8 olefins.

show abstract

Studies on Nickel(II)Complexes. IV. Bis-(N-sec-alkylsalicylaldimine) Complexes: Conformational Equilibria in Solution

Cited by 69 publications

References 2 publications

The crystal structure of bis-(N-isopropyl-3-ethylsalicylaldiminato)palladium

The crystal structure of bis-(N-isopropyl-3-ethylsalicylaldiminato)palladium

Ethylene polymerization by bis(salicylaldiminate)nickel(II)/aluminoxane catalysts

Ionic Liquid-Supported Bis-(salicylaldimine) Nickel Complexes: Robust and Recyclable Catalysts for Ethylene Oligomerization in Biphasic Solvent System

Contact Info

Product

Resources

About