A hybrid bioinspired catechol-alloxazine triangular nickel complex stabilizing protons and electrons

2021 ◽  
Author(s):  
Agnideep Das ◽  
Hannah Jobelius ◽  
Jules Schleinitz ◽  
Stefani Gamboa-Ramírez ◽  
Geordie Creste ◽  
...  
Keyword(s):  
Nickel Complex ◽  
Trinuclear Complex ◽  
Redox Active

We report the design of a unique bioinspired ligand merging redox-active catechol and flavin-related alloxazine substructures. Upon coordination with a Ni(II) salt, this hybrid ligand forms a trinuclear complex containing...

scholarly journals Synthesis, oligomerization and catalytic studies of a redox-active Ni4-cubane: a detailed mechanistic investigation

RSC Advances ◽  
2021 ◽  
Vol 11 (37) ◽  
pp. 22849-22858
Author(s):  
Saroj Kumar Kushvaha ◽  
Maria Francis ◽  
Jayasree Kumar ◽  
Ekta Nag ◽  
Prathap Ravichandran ◽  
...  
Keyword(s):  
Nickel Complex ◽  
Efficient Catalyst ◽  
Aromatic Heterocycles ◽  
Redox Active ◽  
Mechanistic Investigation

A robust tetrameric nickel complex [Ni4((Oal−)2L-Me)4(s)4] (s = solvent) with cubane-like Ni4O4 core topology identified as the efficient catalyst for the diastereoselective cyclopropanation of aromatic heterocycles.

The synthesis and magnetic properties of a linear mixed-valence [Ni3]5+ in an anthyridine tri-nickel complex

2019 ◽  
Vol 48 (27) ◽  
pp. 9912-9915
Author(s):  
Chang-Lin Hsieh ◽  
Tsai-Jung Liu ◽  
You Song ◽  
Gene-Hsiang Lee ◽  
Bih-Yaw Jin ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Valence State ◽  
Nickel Complex ◽  
Mixed Valence ◽  
Trinuclear Complex ◽  
Tridentate Ligand ◽  
Sodium Tetraphenylborate ◽  
Mixed Valence State

A novel trinuclear complex [Ni3(μ3-dbay)4Cl2]I3 (1) with a mixed-valence state was prepared by reacting the tridentate ligand 1,13,14-triaza-dibenz[a,j]anthracene (dibenzanthyridine = dbay) with anhydrous NiCl2 and sodium tetraphenylborate.

Macrocyclic Thiophene-Appended Cyanido-Bridged CoIII/FeII Complexes: Precursors to Mixed-valent Poly-thiophene Hybrid Materials

2009 ◽  
Vol 62 (10) ◽  
pp. 1214 ◽  
Author(s):  
Sharizal Hasan ◽  
Nathan L. Kilah ◽  
Manuel Martinez ◽  
Paul V. Bernhardt
Keyword(s):  
Hybrid Materials ◽  
Transition Metal Ions ◽  
Spectroscopic Properties ◽  
Trinuclear Complex ◽  
Metal Charge ◽  
Trinuclear Complexes ◽  
Redox Active ◽  
Charge Transfer Transitions ◽  
Active Transition ◽  
Metal Charge Transfer

The new cyanido-bridged mixed valent FeII/CoIII macrocyclic complexes [L2CoIII(μ-NC)FeII(CN)5]– and trans-[L2CoIII(μ-NC)FeII(CN)4(μ-CN)CoIIIL2]2+ have been prepared and characterized spectroscopically. The trinuclear complex trans-[L2Co(μ-NC)Fe(CN)4(μ-CN)CoL2](ClO4)2·11H2O has been characterized crystallographically. The di- and trinuclear complexes exhibit metal-to-metal charge transfer transitions characteristic of Class II mixed valent chromophores and their redox and spectroscopic properties have been analyzed by Hush theory. The thiophene group attached to the macrocycle L2 in these complexes may serve as a precursor to conducting polythiophene-based hybrid materials incorporating redox active transition metal ions.

scholarly journals Redox activity of a dissymmetric ligand bridging divalent ytter-bium and reactive nickel fragments

2021 ◽  
Author(s):  
Ding Wang ◽  
Maxime Tricoire ◽  
Valeriu Cemortan ◽  
Jules Moutet ◽  
Grégory Nocton
Keyword(s):  
Nickel Complex ◽  
Bond Formation ◽  
Lanthanide Complex ◽  
Redox Activity ◽  
Trimeric Complex ◽  
Redox Active ◽  
Divalent Lanthanide

The reaction of a nickel complex bearing a redox-active dissymmetric ligand (Kbimpm) with a divalent lanthanide complex, Cp*2Yb(OEt2) affords an unprecedented, trimeric complex with C(sp3)–C(sp3) bond formation between two ligands in an exo position.

scholarly journals A Redox‐Active Nickel Complex that Acts as an Electron Mediator in Photochemical Giese Reactions

2019 ◽  
Vol 58 (15) ◽  
pp. 4953-4957 ◽  
Author(s):  
Thomas van Leeuwen ◽  
Luca Buzzetti ◽  
Luca Alessandro Perego ◽  
Paolo Melchiorre
Keyword(s):  
Nickel Complex ◽  
Electron Mediator ◽  
Redox Active

scholarly journals A Redox‐Active Nickel Complex that Acts as an Electron Mediator in Photochemical Giese Reactions

2019 ◽  
Vol 131 (15) ◽  
pp. 5007-5011 ◽  
Author(s):  
Thomas van Leeuwen ◽  
Luca Buzzetti ◽  
Luca Alessandro Perego ◽  
Paolo Melchiorre
Keyword(s):  
Nickel Complex ◽  
Electron Mediator ◽  
Redox Active

A phenalenyl-based nickel catalyst for the hydroboration of olefins under ambient conditions

2019 ◽  
Vol 48 (17) ◽  
pp. 5779-5784 ◽  
Author(s):  
Gonela Vijaykumar ◽  
Mrinal Bhunia ◽  
Swadhin K. Mandal
Keyword(s):  
Nickel Catalyst ◽  
Nickel Complex ◽  
Ambient Conditions ◽  
Redox Active

Catalytic hydroboration of alkenes is reported using the redox active phenalenyl ligand assisted nickel complex Ni(PLY)2(THF)2 in the presence of pinacolborane under ambient conditions.

Common modifications of selenocysteine in selenoproteins

2019 ◽  
Vol 64 (1) ◽  
pp. 45-53 ◽  
Author(s):  
Elias S.J. Arnér
Keyword(s):  
Amino Acids ◽  
Covalent Binding ◽  
Physicochemical Characteristics ◽  
Redox Active

Abstract Selenocysteine (Sec), the sulfur-to-selenium substituted variant of cysteine (Cys), is the defining entity of selenoproteins. These are naturally expressed in many diverse organisms and constitute a unique class of proteins. As a result of the physicochemical characteristics of selenium when compared with sulfur, Sec is typically more reactive than Cys while participating in similar reactions, and there are also some qualitative differences in the reactivities between the two amino acids. This minireview discusses the types of modifications of Sec in selenoproteins that have thus far been experimentally validated. These modifications include direct covalent binding through the Se atom of Sec to other chalcogen atoms (S, O and Se) as present in redox active molecular motifs, derivatization of Sec via the direct covalent binding to non-chalcogen elements (Ni, Mb, N, Au and C), and the loss of Se from Sec resulting in formation of dehydroalanine. To understand the nature of these Sec modifications is crucial for an understanding of selenoprotein reactivities in biological, physiological and pathophysiological contexts.

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