Development of a Tunable Chiral Pyridine Ligand Unit for Enantioselective Iridium-Catalyzed C–H Borylation

ACS Catalysis ◽  
2021 ◽  
pp. 7339-7349
Author(s):  
Peidong Song ◽  
Linlin Hu ◽  
Tao Yu ◽  
Jiao Jiao ◽  
Yangqing He ◽  
...  
Keyword(s):  
Pyridine Ligand

Three-Phase Electrochemistry of a Highly Lipophilic Neutral Ru-Complex Having a Tridentate Bis(benzimidazolate)pyridine Ligand

2020 ◽  
Author(s):  
Vishwanath R.S ◽  
Masa-aki Haga ◽  
Takumi Watanabe ◽  
Emilia Witkowska Nery ◽  
Martin Jönsson-Niedziolka
Keyword(s):  
Redox Potential ◽  
Organic Phase ◽  
Electron Donor ◽  
Ion Transfer ◽  
Neutral Complex ◽  
Pyridine Ligand ◽  
Electrochemical Testing ◽  
Ru Complex ◽  
Three Phase ◽  
Exceptional Stability

Here we describe the synthesis and electrochemical testing of a heteroleptic bis(tridentate) ruthenium(II) complex [Ru<sup>II</sup>(LR)(L)]<sup>0</sup> (LR =2,6-bis(1-(2-octyldodecan)benzimidazol-2-yl)pyridine, L = 2,6-bis(benzimidazolate)pyridine). It is a neutral complex which undergoes a quasireversible oxidation and reduction at relatively low potential. The newly synthetized compound was used for studies of ion-transfer at the three-phase junction because of the sensitivity of this method to cation expulsion. The [Ru<sup>II</sup>(LR)(L)]<sup>0</sup> shows exceptional stability during cycling and is sufficiently lipophilic even after oxidation to persist in the organic phase also using very hydrophilic anions such as Cl<sup>−</sup>. Given its low redox potential and strong lipophilicity this compound will be of interest as an electron donor in liquid-liquid electrochemistry.

Three-Phase Electrochemistry of a Highly Lipophilic Neutral Ru-Complex Having a Tridentate Bis(benzimidazolate)pyridine Ligand

2020 ◽  
Author(s):  
Vishwanath R.S ◽  
Masa-aki Haga ◽  
Takumi Watanabe ◽  
Emilia Witkowska Nery ◽  
Martin Jönsson-Niedziolka
Keyword(s):  
Redox Potential ◽  
Organic Phase ◽  
Electron Donor ◽  
Ion Transfer ◽  
Neutral Complex ◽  
Pyridine Ligand ◽  
Electrochemical Testing ◽  
Ru Complex ◽  
Three Phase ◽  
Exceptional Stability

Here we describe the synthesis and electrochemical testing of a heteroleptic bis(tridentate) ruthenium(II) complex [Ru<sup>II</sup>(LR)(L)]<sup>0</sup> (LR =2,6-bis(1-(2-octyldodecan)benzimidazol-2-yl)pyridine, L = 2,6-bis(benzimidazolate)pyridine). It is a neutral complex which undergoes a quasireversible oxidation and reduction at relatively low potential. The newly synthetized compound was used for studies of ion-transfer at the three-phase junction because of the sensitivity of this method to cation expulsion. The [Ru<sup>II</sup>(LR)(L)]<sup>0</sup> shows exceptional stability during cycling and is sufficiently lipophilic even after oxidation to persist in the organic phase also using very hydrophilic anions such as Cl<sup>−</sup>. Given its low redox potential and strong lipophilicity this compound will be of interest as an electron donor in liquid-liquid electrochemistry.

Three-Phase Electrochemistry of a Highly Lipophilic Neutral Ru-Complex Having a Tridentate Bis(benzimidazolate)pyridine Ligand

2020 ◽  
Author(s):  
Vishwanath R.S ◽  
Masa-aki Haga ◽  
Takumi Watanabe ◽  
Emilia Witkowska Nery ◽  
Martin Jönsson-Niedziolka
Keyword(s):  
Redox Potential ◽  
Organic Phase ◽  
Electron Donor ◽  
Ion Transfer ◽  
Neutral Complex ◽  
Pyridine Ligand ◽  
Electrochemical Testing ◽  
Ru Complex ◽  
Three Phase ◽  
Exceptional Stability

Here we describe the synthesis and electrochemical testing of a heteroleptic bis(tridentate) ruthenium(II) complex [Ru<sup>II</sup>(LR)(L)]<sup>0</sup> (LR =2,6-bis(1-(2-octyldodecan)benzimidazol-2-yl)pyridine, L = 2,6-bis(benzimidazolate)pyridine). It is a neutral complex which undergoes a quasireversible oxidation and reduction at relatively low potential. The newly synthetized compound was used for studies of ion-transfer at the three-phase junction because of the sensitivity of this method to cation expulsion. The [Ru<sup>II</sup>(LR)(L)]<sup>0</sup> shows exceptional stability during cycling and is sufficiently lipophilic even after oxidation to persist in the organic phase also using very hydrophilic anions such as Cl<sup>−</sup>. Given its low redox potential and strong lipophilicity this compound will be of interest as an electron donor in liquid-liquid electrochemistry.

Synthetic models for bis-metallo active sites. A porphyrin capped by a tetrakis(pyridine) ligand system

1978 ◽  
Vol 100 (9) ◽  
pp. 2899-2901 ◽  
Author(s):  
David A. Buckingham ◽  
Maxwell J. Gunter ◽  
Lewis N. Mander
Keyword(s):  
Active Sites ◽  
Pyridine Ligand ◽  
Ligand System ◽  
Synthetic Models

Electrocatalytic water oxidation by copper(ii) complexes containing a tetra- or pentadentate amine-pyridine ligand

2017 ◽  
Vol 53 (31) ◽  
pp. 4374-4377 ◽  
Author(s):  
Junyu Shen ◽  
Mei Wang ◽  
Peili Zhang ◽  
Jian Jiang ◽  
Licheng Sun
Keyword(s):  
Water Oxidation ◽  
Good Stability ◽  
Pyridine Ligand ◽  
Catalytically Active

Two copper(ii) complexes were demonstrated to be catalytically active for electrochemical water oxidation with good stability in pH 11.5 solutions.

Multinuclear NMR spectra of [Pt(L)Cl3]− (L = pyridine derivatives) complexes and crystal structure of trans-Pt(2,6-di(hydroxymethyl)pyridine)2Cl2•2H2O

1996 ◽  
Vol 74 (11) ◽  
pp. 2121-2130 ◽  
Author(s):  
Fernande D. , ◽  
Corinne Bensimon ◽  
André L. Beauchamp
Keyword(s):  
Crystal Structure ◽  
Pyridine Ring ◽  
Chemical Shifts ◽  
Bond Distance ◽  
Coupling Constants ◽  
Mirror Plane ◽  
Pyridine Derivative ◽  
Pyridine Derivatives ◽  
Pyridine Ligand ◽  
Twofold Axis

Complexes of the type [Pt(L)Cl3]− (L = pyridine derivative) were synthesized and studied by 13C and 195Pt NMR spectroscopies. The 195Pt signals were observed between −1720 and −1897 ppm. No correlation between the δ(Pt) and the pKa of the protonated pyridine derivatives was found. The chemical shifts vary with the substituents on the pyridine ligand. Compounds with substituents in ortho positions were observed at lower fields, except for complexes containing hydroxy or amine groups. The latter compounds were observed at higher fields, close to the signals of the Pt-unsubstituted pyridine compound. These results were explained in terms of the solvent effect. The chemical shifts δ(C) and the coupling constants J(13C–195Pt) were measured and the results interpreted with a view of obtaining information on the nature of the Pt—N bond. The possibility of π-bonding between platinum and the pyridine ligand is examined. The conformation of the pyridine ring in relation to the platinum plane and the energies of the rotation barriers around the Pt—N bond in these types of platinum(II) complexes are briefly discussed. The crystal structure of trans-Pt(2,6-(HOCH2)2py)2Cl2•2H2O was determined by X-ray diffraction. The compound is monoclinic, C2/m, a = 7.022(6), b = 15.646(13), c = 8.344(10) Å, β = 93.35(8)°, Z = 2, R = 0.037. The platinum atom is located at the junction of the twofold axis and the mirror plane, the N atoms and the para-C atom of the pyridine ring are situated on the twofold axis, and the chloride ligands are on the mirror plane. The compound crystallizes with molecules of water, which are H-bonded to the hydroxy groups. The Pt—Cl bond distance is 2.306(2) Å, and that of the Pt—N bond is 2.041 (6) Å. The dihedral angle between the platinum and the pyridine planes is 79.8°. Key words: platinum, pyridine derivatives, NMR, crystal structure.

Synthesis and characterization of luminescent zinc(II) complexes with a N,N-bidentate 1-pyridylimidazo[1,5-a]pyridine ligand

Polyhedron ◽  
2015 ◽  
Vol 90 ◽  
pp. 214-220 ◽  
Author(s):  
G. Attilio Ardizzoia ◽  
Stefano Brenna ◽  
Sara Durini ◽  
Bruno Therrien
Keyword(s):  
Synthesis And Characterization ◽  
Pyridine Ligand

Synthesis, crystal structure and DNA binding of a new Ni(II) coordination compound based on 4-(1-naphthylvinyl)pyridine ligand

Polyhedron ◽  
2020 ◽  
Vol 190 ◽  
pp. 114777
Author(s):  
Akhtaruzzaman ◽  
Samim Khan ◽  
Asma A. Alothman ◽  
Basudeb Dutta ◽  
Saikh Mohammad Wabaidur ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Dna Binding ◽  
Coordination Compound ◽  
Pyridine Ligand

scholarly journals Crystal structure of tris(pyridine)(salicylaldehyde semicarbazonato(2-))cobalt(III)-trichloropyridinecobaltate(II) at 293 and 120K

2007 ◽  
Vol 72 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Goran Bogdanovic ◽  
Vukadin Leovac ◽  
Ljiljana Vojinovic-Jesic ◽  
Biré-Spasojevic De
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Single Crystal ◽  
Intermolecular Interaction ◽  
Complex Anion ◽  
Octahedral Geometry ◽  
Pyridine Ligand ◽  
Similar Composition ◽  
X Ray ◽  
Preferential Position

The crystal structure of [CoIII(L)(py)3][CoIICl3(py)] (H2L=salicylaldehyde semicarbazone)was determined by X-ray analysis based on two single crystal X-ray experiments performed at 120 K and 293 K, respectively. It was found that the pyridine ligand of the complex anion is disordered over two positions. The preferential position of this pyridine found at120Kwas explained in terms of the C-H...Cl intermolecular interaction between the tetrahedral [CoII(py)Cl3]- anions. The mer-octahedral geometry of the cation in the presented crystal structure was compared with previously published structures of similar composition, [CoIII(L1)(py)3]+[CoIICl3(py)]-?EtOH and [CoIII(LI)(py)3]+I3-(H2LI = salicylaldehyde S-methylisothiosemicarbazone). Although the tetrahedral [CoIICl3(py)]- anions possess the same charge, they mutually form different intermolecular interactions which can be realized either by C-H...Cl hydrogen bonds or by ?-? interactions between the pyridine rings.

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