Di(imino)pyridine Complexes as Catalysts for Homogeneous Olefin Oligomerization Reactions

2020 ◽  
pp. 43-49
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Metal Halides ◽  
Substituted Anilines ◽  
Pyridine Ligand ◽  
Metal Centers ◽  
Pyridine Complexes ◽  
Condensation Reactions ◽  
Ligand Precursors ◽  
Olefin Oligomerization

The synthesis of bis(arylimino)pyridine complexes of seven different transition metals and their applications after activation with methylaluminoxane (MAO) in homogeneous olefin dimerization and oligomerization reactions is described. The synthesis of bis(arylimino)pyridine ligand precursors was achieved via condensation reactions of 2,6-diacetylpyridine with different substituted anilines. The bis(arylimino)pyridine compounds were reacted with 3d transition metal halides of the metals Ti, V, Cr, Mn, Fe, Ni and Co to give the corresponding mono-ligated complexes. Among a series of complexes with varying metal centers, but containing the same ligand, the bis(arylimino)pyridine iron(III) complex provided the best results for the dimerization of 1-hexene after activation with MAO. Beside linear products, methyl branched olefins were detected as well. For all product compositions, a marginal higher amount of hexene dimers was observed, e.g. the insertion of 1-hexene proceeds slightly faster than the insertion of 1-pentene.

scholarly journals The reactions of α-amino acids and α-amino acid esters with high valent transition metal halides: synthesis of coordination complexes, activation processes and stabilization of α-ammonium acylchloride cations

RSC Advances ◽  
2017 ◽  
Vol 7 (17) ◽  
pp. 10158-10174 ◽  
Author(s):  
Lorenzo Biancalana ◽  
Marco Bortoluzzi ◽  
Eleonora Ferretti ◽  
Mohammad Hayatifar ◽  
Fabio Marchetti ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Transition Metal ◽  
Transition Metals ◽  
Coordination Compounds ◽  
Coordination Complexes ◽  
Amino Acid Esters ◽  
Metal Halides ◽  
High Valent ◽  
Acid Esters

We describe the synthesis of rare coordination compounds of early transition metals with α-amino acids and α-amino acid esters, the unusual C–C dimerization ofl-proline, and the stabilization of reactive α-ammonium acylchloride cations.

The infrared spectra of complexes of transition metal halides with substituted pyridines

1966 ◽  
Vol 19 (12) ◽  
pp. 2197 ◽  
Author(s):  
NS Gill ◽  
HJ Kingdon
Keyword(s):  
Transition Metal ◽  
Infrared Spectra ◽  
Metal Ion ◽  
Simple Relationship ◽  
Metal Halides ◽  
Pyridine Ligand ◽  
Substituted Pyridines ◽  
Vibrational Bands ◽  
Tetrahedral Complexes

The infrared spectra, in the region 1600-200 cm-1, of a series of complexes formed by transition metal halides with substituted pyridines have been recorded. The assignment of the vibrational bands of the ligands and their shifts in frequency on coordination with a metal ion are discussed. A study of the metal-nitrogen stretching frequencies of tetrahedral complexes of the type, MX2 L2, where the metal is cobalt or zinc, shows that no simple relationship exists between the magnitude of these frequencies and the nature of either the metal ion or the substituted pyridine ligand.

Direct coordination of a germanium(ii) dicationic center to transition metals

2017 ◽  
Vol 53 (9) ◽  
pp. 1467-1469 ◽  
Author(s):  
Ravindra K. Raut ◽  
Moumita Majumdar
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Group 14 ◽  
Metal Centers

A group 14 E(ii) dicationic center effortlessly coordinates to transition metal centers, demonstrating as an efficient cationic ligand.

Decarbonylation of phenylacetic acids by high valent transition metal halides

2019 ◽  
Vol 48 (17) ◽  
pp. 5725-5734
Author(s):  
Niccolò Bartalucci ◽  
Fabio Marchetti ◽  
Stefano Zacchini ◽  
Guido Pampaloni
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Carboxylic Acids ◽  
Room Temperature ◽  
Metal Halides ◽  
General Reaction ◽  
High Valent

The unusual decarbonylation of α-phenyl carboxylic acids with suitable substituents is a general reaction promoted at room temperature by homoleptic halides of high valent transition metals.

Methane activation by ZSM-5-supported transition metal centers

2021 ◽  
Author(s):  
Daniyal Kiani ◽  
Sagar Sourav ◽  
Yadan Tang ◽  
Jonas Baltrusaitis ◽  
Israel E. Wachs
Keyword(s):  
Transition Metal ◽  
Methane Activation ◽  
Group V ◽  
Metal Centers ◽  
Methane Dehydroaromatization

The literature on methane dehydroaromatization (MDA) to benzene using ZSM-5 supported, group V–VIII transition metal-based catalysts (MOx/ZSM-5) is critically reviewed with a focus on in situ and operando molecular insights.

Intercalation of First Row Transition Metals inside Covalent-Organic Frameworks (COF): a Strategy to Fine Tune the Electronic Properties of Porous Crystalline Materials

2018 ◽  
Author(s):  
Srimanta Pakhira ◽  
Jose Mendoza-Cortes
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Electronic Properties ◽  
High Surface ◽  
Electronic Devices ◽  
High Surface Area ◽  
Main Role ◽  
Covalent Organic Frameworks ◽  
Porous Network ◽  
Crystalline Materials

<div>Covalent organic frameworks (COFs) have emerged as an important class of nano-porous crystalline materials with many potential applications. They are intriguing platforms for the design of porous skeletons with special functionality at the molecular level. However, despite their extraordinary properties, it is difficult to control their electronic properties, thus hindering the potential implementation in electronic devices. A new form of nanoporous material, COFs intercalated with first row transition metal is proposed to address this fundamental drawback - the lack of electronic tunability. Using first-principles calculations, we have designed 31 new COF materials <i>in-silico</i> by intercalating all of the first row transition metals (TMs) with boroxine-linked and triazine-linked COFs: COF-TM-x (where TM=Sc-Zn and x=3-5). This is a significant addition considering that only 187 experimentally COFs structures has been reported and characterized so far. We have investigated their structure and electronic properties. Specifically, we predict that COF's band gap and density of states (DOSs) can be controlled by intercalating first row transition metal atoms (TM: Sc - Zn) and fine tuned by the concentration of TMs. We also found that the $d$-subshell electron density of the TMs plays the main role in determining the electronic properties of the COFs. Thus intercalated-COFs provide a new strategy to control the electronic properties of materials within a porous network. This work opens up new avenues for the design of TM-intercalated materials with promising future applications in nanoporous electronic devices, where a high surface area coupled with fine-tuned electronic properties are desired.</div>

Bond-length distributions for ions bonded to oxygen: Metalloids and post-transition metals

2017 ◽  
Author(s):  
Olivier Charles Gagné ◽  
Frank Christopher Hawthorne
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Metal Ions ◽  
Bond Length ◽  
Lone Pair ◽  
Transition Metal Ions ◽  
Oxygen Lone Pair

Bond-length distributions are examined for thirty-three configurations of the metalloid ions and fifty-six configurations of the post-transition-metal ions bonded to oxygen. Lone-pair stereoactivity is discussed.

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