Five-co-ordinate complexes of first transition series ions with 2,2′,2″-terpyridine

Judge, John; Reiff, W. M.; Intille, G. M.; Ballway, Patricia; Baker, W. A.

doi:10.1016/0022-1902(67)80214-8

Cited by 39 publications

(17 citation statements)

References 7 publications

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“…In this context, it should be mentioned that the reaction of FeCl 2 and terpyridine (terpy) can give [Fe(terpy) 2 ][FeCl 4 ] in the solid state 9–11. It is likely that the unsubstituted di(imino)pyridine complex in combination with MAO is inactive in ethylene polymerization because of an analogous composition.…”

Section: Introductionmentioning

confidence: 99%

Iron(II)‐based catalysts for ethene oligomerization

Schmidt

Hammon

Gottfried

et al. 2003

J of Applied Polymer Sci

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ABSTRACT:The synthesis of iron(II) complexes with various tridentate di(imino)pyridine ligands and their potential as ethene oligomerization catalysts are described. The ligands are characterized by 1 H-and 13 C-NMR spectroscopy and the complexes only by mass spectrometry due to their paramagnetism. After activation either with methylalumoxane (MAO) or with a heterogeneous cocatalyst consisting of partially hydrolyzed trimethylaluminum and silica gel, the prepared complexes proved to be good catalysts for the oligomerization of ethene. 1-Octene, 1-hexene, and 1-decene were the major products, formed in very high isomeric purity (99.9 %).

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Section: Introductionmentioning

confidence: 99%

Iron(II)‐based catalysts for ethene oligomerization

Schmidt

Hammon

Gottfried

et al. 2003

J of Applied Polymer Sci

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“…The terpyridine molecule, because of its three pyridine nitrogen donor atoms, can form stable complexes of the [M(tpy)] n+ type with transition metals. Nickel(II) complexes of the composition [Ni(tpy)X 2 ] (X = halides and pseudohalides) [6][7][8][9][10] have been structurally characterized by X-ray crystallographic analysis as monomeric trigonal-bipyramidal complexes [8][9][10], or as dimeric X-bridged species containing octahedrally configured nickel(II) [10,11], depending on the nature of the X coligand. In dilute solutions, monomeric species can be expected [6], and they can be pentacoordinate or hexacoordinate if further ligands are available [8,10,12].…”

Section: Introductionmentioning

confidence: 99%

“…Nickel(II) complexes of the composition [Ni(tpy)X 2 ] (X = halides and pseudohalides) [6][7][8][9][10] have been structurally characterized by X-ray crystallographic analysis as monomeric trigonal-bipyramidal complexes [8][9][10], or as dimeric X-bridged species containing octahedrally configured nickel(II) [10,11], depending on the nature of the X coligand. In dilute solutions, monomeric species can be expected [6], and they can be pentacoordinate or hexacoordinate if further ligands are available [8,10,12]. For example, the recrystallization of [Ni(tpy)Cl 2 ]·3H 2 O from a water/ethanol mixture gave the isomeric [Ni(tpy)Cl(H 2 O) 2 ]Cl·H 2 O in single crystalline form [12] nickel(II) complexes of the composition [Ni(tpy) 2 ] 2+ , where all the X type coligands are outer sphere, and show octahedral coordination [3,13].…”

Section: Introductionmentioning

confidence: 99%

Exploring Mechanisms in Ni Terpyridine Catalyzed C–C Cross-Coupling Reactions—A Review

2018

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Abstract:In recent years, nickel has entered the stage for catalyzed C-C cross-coupling reactions, replacing expensive palladium, and in some cases enabling the use of new substrate classes. Polypyridine ligands have played an important role in this development, and the prototypical tridentate 2,2 :6 ,2 -terpyridine (tpy) stands as an excellent example of these ligands. This review summarizes research that has been devoted to exploring the mechanistic details in catalyzed C-C cross-coupling reactions using tpy-based nickel systems.

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“…This indicates that the reaction is inefficient at high pH even if a high oxidation of phenol by Fe complexes using terpyridine was expected. This is probably due to the fact that the terpyridine ring, which has high stabilizing character, stabilizes strongly Fe(II) without permitting the oxidation to Fe(III) [36,37]. A reaction is of order zero when the reaction rate is independent from the substance concentration, which indicates that the conversion is proportional to time.…”

Section: Analysis Of Phenol Degradation By Conventional and Modified mentioning

confidence: 99%

“…The resulting solution was allowed to cool and the green crystals obtained were collected and washed with hydrochloric acid (2.0 mol L -1 ). The free base was isolated when the hydrochloride of the compound in water was neutralized with ammonium hydroxide (20%), then it was re-crystallized from aqueous ethanol and dried over P [31,[36][37][38][39][40].…”

Section: Synthesis Of Tris(benzimidazol-2-ylmethyl)amine (Tbma)mentioning

confidence: 99%

Use of Ligand-based Iron Complexes for Phenol Degradation by Fenton Modified Process

et al. 2017

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The efficiency of phenol degradation by the iron complexes ([Fe(TBMA)Cl3∙3H2O] and [Fe(terpy)Cl2]) is compared with that of the Fenton reaction. The results show that although the Fenton reaction efficiently oxidizes phenol at low pH’s, the Fenton modified reagents (iron complexes/H2O2) effectively oxidize phenol at neutral pH. Besides, the factorial designing study is performed by considering three independent variables: (i) [Fe] (A), (ii) pH (B), and (iii) [H2O2] (C). For the Fenton reaction, the normal probability plot reveals that two factors, such as concentration of Fe2+ and interaction{[H2O2]∙pH} have considerable influence on the phenol oxidation; in the normal probability plot of the complexes, factors C (concentration of H2O2) and AC {[Fe]∙[H2O2]} have an effect on the oxidation of the phenol by [Fe(terpy)Cl2]/H2O2, while for [Fe(TBMA)Cl3∙3H2O], factors B and AC significantly influence the degradation. Of both iron complexes, [Fe(TBMA)Cl3∙3H2O]/H2O2 is an excellent oxidant, showing a good response at pH 7.0.

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Five-co-ordinate complexes of first transition series ions with 2,2′,2″-terpyridine

Cited by 39 publications

References 7 publications

Iron(II)‐based catalysts for ethene oligomerization

Iron(II)‐based catalysts for ethene oligomerization

Exploring Mechanisms in Ni Terpyridine Catalyzed C–C Cross-Coupling Reactions—A Review

Use of Ligand-based Iron Complexes for Phenol Degradation by Fenton Modified Process

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