Ruthenium-nickel heterobimetallic complex as a bifunctional catalyst for ROMP of norbornene and ethylene polymerization

2021 ◽  
Author(s):  
Gustavo Henrique Cicero Masson ◽  
Thais R Cruz ◽  
Patrik Dione de Santana Gois ◽  
Daniele Maria Martins ◽  
Benedito S. Lima-Neto ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Elemental Analysis ◽  
Ethylene Polymerization ◽  
Bifunctional Catalyst ◽  
Spectroscopic Studies ◽  
Computational Studies ◽  
Heterobimetallic Complex

Monometallic [RuCl2(η6-p-cymene)(pipNH2)] (mono-Ru) and heterobimetallic [RuCl2(p-cymene)](μ-Schiff-pip)Ni(PPh3)Cl] (Ru-Ni) complexes were successfully synthesized. They were fully characterized by FTIR, UV-Vis, and NMR spectroscopic studies, elemental analysis, cyclic voltammetry and computational studies. Complex...

scholarly journals Computational Studies of 4-Formylpyridinethiosemicarbazone and Structural and Biological Studies of Its Ni(II) and Cu(II) Complexes

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Mydhili P. Sripathi ◽  
Sireesha Berely ◽  
Chittireddy Venkata Ramana Reddy
Keyword(s):  
Elemental Analysis ◽  
Radical Scavenging ◽  
Molar Conductance ◽  
Computational Studies ◽  
Hydrolytic Cleavage ◽  
Bacterial Strains ◽  
Intercalative Mode ◽  
Biological Studies ◽  
Calf Thymus ◽  
The Stability

To understand the stability, chelation behaviour, and biological activity of 4-Formylpyridinethiosemicarbazone (H4FPT), it is important to recognize its interactive geometry. Hence, computational studies on geometrically optimized structures of thione and thiol forms of H4FPT were performed. Binary metal complexes of the ligand, H4FPT (L) with the Ni(II) and Cu(II) metal ions (M), were synthesized and characterized by various spectroanalytical techniques as elemental analysis, molar conductance, magnetic susceptibility measurements, LC-MS, TGA, IR, UV-Visible, ESR, and powder XRD. Elemental analysis, LC-MS, and TGA studies indicate 1:2 (ML2) composition for mononuclear Ni(II) complex and 1:1 (ML) composition for dinuclear Cu(II) complex. Electronic absorption titrations, fluorescence quenching studies, and viscosity measurements suggest intercalative mode of binding of the complexes with calf thymus DNA (CT-DNA). These complexes also promote hydrolytic cleavage of plasmid pBR322. The ligand (H4FPT) and its complexes showed moderate-to-good activity against Gram-positive and Gram-negative bacterial strains. The DPPH radical scavenging studies showed antioxidant nature of both complexes.

scholarly journals Toward a mechanistic understanding of electrocatalytic nanocarbon

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Erik J. Askins ◽  
Marija R. Zoric ◽  
Matthew Li ◽  
Zhengtang Luo ◽  
Khalil Amine ◽  
...  
Keyword(s):  
Spectroscopic Studies ◽  
Synthetic Methods ◽  
Computational Studies ◽  
Molecular Models ◽  
Chemical Production ◽  
True Nature ◽  
Catalytic Mechanisms ◽  
Mechanistic Understanding ◽  
Further Development

AbstractElectrocatalytic nanocarbon (EN) is a class of material receiving intense interest as a potential replacement for expensive, metal-based electrocatalysts for energy conversion and chemical production applications. The further development of EN will require an intricate knowledge of its catalytic behaviors, however, the true nature of their electrocatalytic activity remains elusive. This review highlights work that contributed valuable knowledge in the elucidation of EN catalytic mechanisms. Experimental evidence from spectroscopic studies and well-defined molecular models, along with the survey of computational studies, is summarized to document our current mechanistic understanding of EN-catalyzed oxygen, carbon dioxide and nitrogen electrochemistry. We hope this review will inspire future development of synthetic methods and in situ spectroscopic tools to make and study well-defined EN structures.

scholarly journals Photocatalytic Hydrogen Evolution by tris-dithiolene tungsten complexes

2016 ◽  
Vol 14 (1) ◽  
pp. 393-403 ◽  
Author(s):  
Eugenia Koutsouri ◽  
Christiana A. Mitsopoulou
Keyword(s):  
Cyclic Voltammetry ◽  
Acetic Acid ◽  
Hydrogen Evolution ◽  
Electron Donor ◽  
Elemental Analysis ◽  
Photocatalytic Hydrogen Evolution ◽  
Fluorescence Spectrophotometry ◽  
Tungsten Complexes ◽  
Photocatalytic System ◽  
Proton Source

AbstractHerein, we report on the homogeneous photocatalytic evolution of hydrogen by using as reductive catalysts the prismatic symmetric tris – dithiolene complexes of the tungsten, namely [W{S2C2(Ph)2}3] (1) and its monoanion [W{S2C2(Ph)2}3](TBA) (2). Complex 2 is fully characterized by elemental analysis, ESI-MS, IR, UV-Vis and fluorescence spectrophotometry as well as cyclic voltammetry. The photocatalytic system consists of [ReBr(CO)3(bpy)] as a photosensitizer, triethanolamine as a sacrificial electron donor and acetic acid as the proton source. Although the activity of the photocatalytic system is rather small (TON=18), it indicates that the homoleptic tris dithiolene complexes can act as proton reductive catalysts with their monoanion form to be more active in accordance with the findings for the bis - dithiolene complexes.

scholarly journals Organoruthenium(II) thiosemicarbazone complexes: synthesis, spectral characterization, DNA binding and DNA cleavage studies

2013 ◽  
Vol 11 (6) ◽  
pp. 1010-1018 ◽  
Author(s):  
Gunasekaran Raja ◽  
Chinnasamy Jayabalakrishnan
Keyword(s):  
Elemental Analysis ◽  
13C Nmr ◽  
Dna Cleavage ◽  
Spectroscopic Studies ◽  
Spectral Studies ◽  
Mass Spectral ◽  
Cleavage Activity ◽  
Dna Cleavage Activity ◽  
Thiosemicarbazone Complexes ◽  
Ct Dna

AbstractA series of new ruthenium(II) complexes were synthesized with Schiff bases derived from salicylaldehyde / o-hydroxyacetophenone/ o-vanillin / 2-hydroxy-1-naphthaldehyde with thiosemicarbazide and acetyl furan. They are characterized by elemental analysis, IR, electronic, 1H NMR, 13C NMR and mass spectral studies. The elemental analysis suggests the stoichiometry to be 1:1 (metal:ligand). Four of these complexes were tested for its binding with CT-DNA using absorption spectroscopic studies and two of these complexes exhibit efficient DNA cleavage activity.

Supramolecular hetero-porphyrin SWNT complexes

2011 ◽  
Vol 15 (04) ◽  
pp. 257-263 ◽  
Author(s):  
Ashley Brewer ◽  
Matthew Lacey ◽  
John R. Owen ◽  
Iris Nandhakumar ◽  
Eugen Stulz
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Cyclic Voltammetry ◽  
Elemental Analysis ◽  
Single Walled Carbon Nanotubes ◽  
High Adsorption ◽  
Single Walled Carbon ◽  
Order Of Magnitude ◽  
Walled Carbon Nanotubes

The complexation of single walled carbon nanotubes (SWNTs) with neutral, anionic and cationic porphyrins has been investigated under identical complex forming conditions. The determination of the porphyrin loading reveals large differences depending on the nature of the porphyrin used. Combinations of different porphyrins to form mixed hetero-porphyrin complexes shows that the mixture of a cationic and anionic porphyrin results in loading which is an order of magnitude larger than in all other complexes. This complex also exhibits high adsorption and emission intensities and can be regarded as an extended co-operative binary ionic (CBI) solid. The complexes were further studied using Raman spectroscopy, elemental analysis, AFM and cyclic voltammetry.

Zirconocene Ketimides: Synthesis, Structural Characterization, Ethylene Polymerization Activity, and ab Initio Computational Studies

2000 ◽  
Vol 19 (21) ◽  
pp. 4369-4375 ◽  
Author(s):  
David R. Armstrong ◽  
Kenneth W. Henderson ◽  
Ian Little ◽  
Charles Jenny ◽  
Alan R. Kennedy ◽  
...  
Keyword(s):  
Ab Initio ◽  
Structural Characterization ◽  
Ethylene Polymerization ◽  
Computational Studies

scholarly journals Microwave-Assisted Synthesis and Properties of Novel Hexaazatrinaphthylene Dendritic Scaffolds

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 5038
Author(s):  
Daniel García Velázquez ◽  
Rafael Luque ◽  
Ángel Gutiérrez Ravelo
Keyword(s):  
Cyclic Voltammetry ◽  
Organic Synthesis ◽  
Elemental Analysis ◽  
13C Nmr ◽  
Water Soluble ◽  
Microwave Assisted Synthesis ◽  
1H And 13C Nmr ◽  
Maldi Tof Ms ◽  
Microwave Assisted ◽  
Tof Ms

A novel family of water-soluble π-conjugated hexaazatrinaphthylenes-based dendritic architectures constructed by hexaketocyclohexane and 1,2,4,5-benzenetetramine units is developed in a microwave-assisted organic synthesis (MAOS) approach. The structures and purity of these compounds are verified by 1H and 13C-NMR, MALDI-TOF MS, UV-vis, elemental analysis, DSC, AFM, STM and cyclic voltammetry.

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