Synthesis and characterization of 2,7-bis(2-pyridyl)-1,8-diazaanthraquinone — A redox-active ligand designed for the construction of supramolecular grids

2006 ◽  
Vol 84 (10) ◽  
pp. 1263-1267 ◽  
Author(s):  
Rajsapan Jain ◽  
Sharon L Caldwell ◽  
Anika S Louie ◽  
Robin G Hicks
Keyword(s):  
Radical Anion ◽  
Synthesis And Characterization ◽  
Electrochemical Studies ◽  
Reduction Processes ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active ◽  
Metallosupramolecular Chemistry ◽  
Reversible Reduction

Double condensation of 2-acetylpyridine with 1,3-diaminobenzene-4,6-dicarboxaldehyde affords 2,7-bis(2-pyridyl)-1,8-diazaanthracene, which was subsequently oxidized to the corresponding quinone. Electrochemical studies indicate two reversible reduction processes corresponding to semiquinone and hydroquinonate formation. Electron-withdrawing pyridine groups and the nitrogen atoms make this somewhat more easily reduced than anthraquinone. This compound is redox-active and can be reduced to its radical anion, a potential spin-bearing ligand for the construction of [2 × 2] metallo-grid structures.Key words: quinone, grid, supramolecular, bistridentate, electrochemistry, metallosupramolecular chemistry.

scholarly journals A Novel Five-coordinate Mn Complex with a Redox-active SNNNS Ligand System

2010 ◽  
Vol 65 (3) ◽  
pp. 258-262 ◽  
Author(s):  
Katharina Dürr ◽  
Denis A. Yalalov ◽  
Frank W. Heinemann ◽  
Svetlana B. Tsogoeva ◽  
Ivana Ivanović-Burmazović
Keyword(s):  
Redox Activity ◽  
Reduction Peak ◽  
Central Metal ◽  
Redox Active Ligand ◽  
Trigonal Bipyramidal ◽  
Active Ligand ◽  
Redox Active ◽  
Pyridine Nitrogen ◽  
Distorted Trigonal Bipyramidal

Synthesis and characterization of a manganese complex of a new redox-active diaminocyclohexane derivative of a thiourea-based ligand with SNNNS donor atom set is reported. The molecular structure of the complex exhibits a pentadentate SNNNS ligand coordinated in the neutral form to the Mn(II) center. The coordination around the central metal is best described as distorted trigonal bipyramidal with the pyridine nitrogen and the two sulfur atoms being in the equatorial plane and the remaining two nitrogen donors occupying the apical positions of the bipyramid. Cyclic voltammetry in DMSO shows the MnII/MnIII redox couple with the oxidation peak at −0.199 V and the reduction peak at −0.587 V vs. Fc/Fc+ (scan rate 0.5 V s−1). The ligand itself possesses redox activity and exhibits prominent oxidation and reduction peaks at −1.194 and −1.481 V vs. Fc/Fc+, respectively. The results of electrochemical experiments under oxygen atmosphere suggest that upon reaction with electrochemically generated superoxide the redox-active ligand is modified causing decomposition of the complex.

scholarly journals The semiquinone radical anion of 1,10-phenanthroline-5,6-dione: synthesis and rare earth coordination chemistry

2018 ◽  
Vol 54 (80) ◽  
pp. 11284-11287 ◽  
Author(s):  
James R. Hickson ◽  
Samuel J. Horsewill ◽  
Jake McGuire ◽  
Claire Wilson ◽  
Stephen Sproules ◽  
...  
Keyword(s):  
Rare Earth ◽  
Coordination Chemistry ◽  
Radical Anion ◽  
Semiquinone Radical ◽  
Metal Compounds ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active ◽  
Rare Earth Coordination ◽  
Semiquinone Radical Anion

The redox-active ligand as a route to heterobimetallic rare earth-transition metal compounds containing a semiquinone radical anion.

Reactivity of Aluminum Complexes of Redox-Active Ligand toward N-Heterocyclic Carbene and Its Thione

2019 ◽  
Vol 39 (1) ◽  
pp. 66-73 ◽  
Author(s):  
Vladimir G. Sokolov ◽  
Tatyana S. Koptseva ◽  
Roman V. Rumyantcev ◽  
Xiao-Juan Yang ◽  
Yanxia Zhao ◽  
...  
Keyword(s):  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active ◽  
Aluminum Complexes

POSSIBILITY OF MOLECULAR-SWITCH WITH CONTROLLED HYDROGEN BOND: UTILITY OF COMBINATION OF 2,2′-BIIMIDAZOLE AND REDOX-ACTIVE LIGAND

2005 ◽  
Vol 04 (01) ◽  
pp. 333-344 ◽  
Author(s):  
HIROTOSHI MORI ◽  
EISAKU MIYOSHI
Keyword(s):  
Density Functional ◽  
Molecular Level ◽  
Molecular Switch ◽  
Vibration Band ◽  
Functional Theory ◽  
Inorganic Molecule ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active ◽  
Stretching Vibration

A new inorganic molecule [ Co(Hbim) ( C 6 H 4 O 2)( NH 3)2]2 that can be used as a new optically durable molecular switch was theoretically designed in the framework of density functional theory. Three stable minima, belonging to 1 A g , 5 A 1, and 9 A g states, were found in the complex. Theoretically predicted infrared spectra of the complexes showed that a strong peak of NH stretching vibration is observed at 2690, 2120, and 2770 cm -1 in the 1 A g , 5 A 1, and 9 A g states, respectively. The apparent red shift of the NH stretching vibration band in the 5 A 1 state make it possible to distinguish the electronic state from others (1 A g and 9 A g ). This means that the complex can be used as a molecular level switch whose memory can be stably read by IR light without any photoreaction process; namely, without memory degradation.

Isolation of a uranium(iii) benzophenone ketyl radical that displays redox-active ligand behaviour

2014 ◽  
Vol 43 (48) ◽  
pp. 17885-17888 ◽  
Author(s):  
Ellen M. Matson ◽  
John J. Kiernicki ◽  
Nickolas H. Anderson ◽  
Phillip E. Fanwick ◽  
Suzanne C. Bart
Keyword(s):  
Ketyl Radical ◽  
Radical Complex ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active ◽  
Reducing Equivalents

The first uranium(iii) charge separated ketyl radical complex, Tp*2U(OC·Ph2), has been isolated and acts as a potent two-electron reductant with reducing equivalents derived from both uranium and the redox-active benzophenone.

Metal–Organic Frameworks Derived from Calcium and Strontium Complexes of a Redox-Active Ligand

2021 ◽  
Vol 60 (5) ◽  
pp. 3238-3248
Author(s):  
Natalia L. Bazyakina ◽  
Valentin M. Makarov ◽  
Sergey Yu. Ketkov ◽  
Artem S. Bogomyakov ◽  
Roman V. Rumyantcev ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active ◽  
Metal Organic

Catalytic nitrene transfer by a zirconium(iv) redox-active ligand complex

2011 ◽  
Vol 2 (1) ◽  
pp. 166-169 ◽  
Author(s):  
Andy I. Nguyen ◽  
Ryan A. Zarkesh ◽  
David C. Lacy ◽  
Megan K. Thorson ◽  
Alan F. Heyduk
Keyword(s):  
Ligand Complex ◽  
Nitrene Transfer ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active

Synthesis and properties of a redox active ligand with bispicorylamino groups and its dinuclear complex

Polyhedron ◽  
2007 ◽  
Vol 26 (9-11) ◽  
pp. 2174-2178 ◽  
Author(s):  
Masafumi Yano ◽  
Masayuki Fujita ◽  
Masaya Miyake ◽  
Masakazu Tatsumi ◽  
Tatsuo Yajima ◽  
...  
Keyword(s):  
Dinuclear Complex ◽  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active

scholarly journals Correction: Redox-active ligand based Mn(i)-catalyst for hydrosilylative ester reduction

2022 ◽  
Author(s):  
Soumi Chakraborty ◽  
Arpan Das ◽  
Swadhin K. Mandal
Keyword(s):  
Redox Active Ligand ◽  
Active Ligand ◽  
Redox Active

Correction for ‘Redox-active ligand based Mn(i)-catalyst for hydrosilylative ester reduction’ by Soumi Chakraborty et al., Chem. Commun., 2021, 57, 12671–12674, DOI: 10.1039/D1CC05614J.

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