The effect of Schiff base ligands on the structure and catalytic activity of cobalt complexes in hydrosilylation of olefins

Bocian, Aleksandra; Skrodzki, Maciej; Kubicki, Maciej; Gorczyński, Adam; Pawluć, Piotr; Patroniak, Violetta

doi:10.1016/j.apcata.2020.117665

Cited by 16 publications

(8 citation statements)

References 43 publications

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“…24 Among them, the above salen-type compounds are important in that complexes containing these ligands have been employed as catalysts in several catalytic systems. [25][26][27][28][29][30][31][32][33] Salen-type compounds have been widely used as ligands in coordination complexes due to the easiness and low cost of syntheses of polydentate ligands with fine-tunable structural and electronic features. 25,26,34 These tunable properties, along with the availability of donor atoms other than the imine nitrogen, enable these ligands to coordinate to virtually any metal center, thus making it possible to stabilize a wide range of oxidation states.…”

Section: Introductionmentioning

confidence: 99%

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Uranyl N₂O₂-Schiff base complex as co-catalyst in ethanol electro-oxidation: synthesis, crystallographic, spectroscopic, electrochemical, and DFT characterization, and catalytic investigation

Barbosa,

Soares,

Cruz

et al. 2023

New J. Chem.

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Section: Introductionmentioning

confidence: 99%

“…24 Among them, the above salen-type compounds are important in that complexes containing these ligands have been employed as catalysts in several catalytic systems. 25–33…”

Section: Introductionmentioning

confidence: 99%

Uranyl N₂O₂-Schiff base complex as co-catalyst in ethanol electro-oxidation: synthesis, crystallographic, spectroscopic, electrochemical, and DFT characterization, and catalytic investigation

Barbosa,

Soares,

Cruz

et al. 2023

New J. Chem.

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“…Knowledge about the coordination mode, structure and function of specific binding sites in biomimetic artificial ligands with SH/NH groups and their metal complexes biomolecules provides us knowledge that can be transferred to a new generation of materials and applications, such as catalysis [ 10 ], bioassays [ 11 ] or general peptide-governed metal sorption [ 12 , 13 ]. It is important to note that often, seemingly very similar coordination motifs (as also in the case of this work) do not necessarily lead to the same coordination and functional outcomes, which are important factors to consider in the design of novel biomimetics, catalysts and materials [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

CH vs. HC—Promiscuous Metal Sponges in Antimicrobial Peptides and Metallophores

et al. 2023

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Histidine and cysteine residues, with their imidazole and thiol moieties that deprotonate at approximately physiological pH values, are primary binding sites for Zn(II), Ni(II) and Fe(II) ions and are thus ubiquitous both in peptidic metallophores and in antimicrobial peptides that may use nutritional immunity as a way to limit pathogenicity during infection. We focus on metal complex solution equilibria of model sequences encompassing Cys–His and His–Cys motifs, showing that the position of histidine and cysteine residues in the sequence has a crucial impact on its coordination properties. CH and HC motifs occur as many as 411 times in the antimicrobial peptide database, while similar CC and HH regions are found 348 and 94 times, respectively. Complex stabilities increase in the series Fe(II) < Ni(II) < Zn(II), with Zn(II) complexes dominating at physiological pH, and Ni(II) ones—above pH 9. The stabilities of Zn(II) complexes with Ac-ACHA-NH2 and Ac-AHCA-NH2 are comparable, and a similar tendency is observed for Fe(II), while in the case of Ni(II), the order of Cys and His does matter—complexes in which the metal is anchored on the third Cys (Ac-AHCA-NH2) are thermodynamically stronger than those where Cys is in position two (Ac-ACHA-NH2) at basic pH, at which point amides start to take part in the binding. Cysteine residues are much better Zn(II)-anchoring sites than histidines; Zn(II) clearly prefers the Cys–Cys type of ligands to Cys–His and His–Cys ones. In the case of His- and Cys-containing peptides, non-binding residues may have an impact on the stability of Ni(II) complexes, most likely protecting the central Ni(II) atom from interacting with solvent molecules.

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“…Our previous experience demonstrates that even subtle structural alterations such as topology of the non-coordinating (benz)imidazole group can be responsible for significant changes in the catalytic processes of silanes with unsaturated organic compounds 45 – 47 , as well as for the biological outcomes in terms of interactions with nucleic acids 48 . When ‘benz’ is combined with ‘phenox’ in a bis-compartmental ligand H 3 L 1 , we were able to demonstrate how lanthanide(III) assemblies can help in better understanding of molecular nanomagnetism and the underlying symmetry aspects 49 , 50 .…”

Section: Introductionmentioning

confidence: 99%

Unexpected structural complexity of d-block metallosupramolecular architectures within the benzimidazole-phenoxo ligand scaffold for crystal engineering aspects

Marcinkowski,

Kubicki,

Consiglio

et al. 2023

Sci Rep

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Design of metallosupramolecular materials encompassing more than one kind of supramolecular interaction can become deceptive, but it is necessary to better understand the concept of the controlled formation of supramolecular systems. Herein, we show the structural diversity of the bis-compartmental phenoxo-benzimidazole ligand H3L1 upon self-assembly with variety of d-block metal ions, accounting for factors such as: counterions, pH, solvent and reaction conditions. Solid-state and solution studies show that the parent ligand can accommodate different forms, related to (de)protonation and proton-transfer, resulting in the formation of mono-, bi- or tetrametallic architectures, which was also confirmed with control studies on the new mono-compartmental phenoxo-benzimidazole H2L2 ligand analogue. For the chosen architectures, structural variables such as porous character, magnetic behaviour or luminescence studies were studied to demonstrate how the form of H3L1 ligand affects the final form of the supramolecular architecture and observed properties. Such complex structural variations within the benzimidazole-phenoxo-type ligand have been demonstrated for the first time and this proof-of-concept can be used to integrate these principles in more sophisticated architectures in the future, combining both the benzimidazole and phenoxide subunits. Ultimately, those principles could be utilized for targeted manipulation of properties through molecular tectonics and crystal engineering aspects.

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The effect of Schiff base ligands on the structure and catalytic activity of cobalt complexes in hydrosilylation of olefins

Cited by 16 publications

References 43 publications

Uranyl N₂O₂-Schiff base complex as co-catalyst in ethanol electro-oxidation: synthesis, crystallographic, spectroscopic, electrochemical, and DFT characterization, and catalytic investigation

Uranyl N₂O₂-Schiff base complex as co-catalyst in ethanol electro-oxidation: synthesis, crystallographic, spectroscopic, electrochemical, and DFT characterization, and catalytic investigation

CH vs. HC—Promiscuous Metal Sponges in Antimicrobial Peptides and Metallophores

Unexpected structural complexity of d-block metallosupramolecular architectures within the benzimidazole-phenoxo ligand scaffold for crystal engineering aspects

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The effect of Schiff base ligands on the structure and catalytic activity of cobalt complexes in hydrosilylation of olefins

Cited by 16 publications

References 43 publications

Uranyl N2O2-Schiff base complex as co-catalyst in ethanol electro-oxidation: synthesis, crystallographic, spectroscopic, electrochemical, and DFT characterization, and catalytic investigation

Uranyl N2O2-Schiff base complex as co-catalyst in ethanol electro-oxidation: synthesis, crystallographic, spectroscopic, electrochemical, and DFT characterization, and catalytic investigation

CH vs. HC—Promiscuous Metal Sponges in Antimicrobial Peptides and Metallophores

Unexpected structural complexity of d-block metallosupramolecular architectures within the benzimidazole-phenoxo ligand scaffold for crystal engineering aspects

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Product

Resources

About

Uranyl N₂O₂-Schiff base complex as co-catalyst in ethanol electro-oxidation: synthesis, crystallographic, spectroscopic, electrochemical, and DFT characterization, and catalytic investigation

Uranyl N₂O₂-Schiff base complex as co-catalyst in ethanol electro-oxidation: synthesis, crystallographic, spectroscopic, electrochemical, and DFT characterization, and catalytic investigation