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

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 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.

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 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 Humin as an External Electron Mediator for Microbial Pentachlorophenol Dechlorination: Exploration of Redox Active Structures Influenced by Isolation Methods

2018 ◽  
Vol 15 (12) ◽  
pp. 2753 ◽  
Author(s):  
Duyen Minh Pham ◽  
Arata Katayama
Keyword(s):  
Structural Characteristics ◽  
Minor Component ◽  
Electron Mediator ◽  
Active Structures ◽  
Partial Structures ◽  
Redox Active ◽  
Isolation Methods ◽  
Peptidoglycan Structure ◽  
Quinone Structure ◽  
A Minor

Humin (HM) has been reported to function as an external electron mediator (EEM) in various microbial reducing reactions. In this study, the effect of isolation methods on EEM functionality and the chemical/electrochemical structures of HM were examined based on the correlation between dechlorination rates in the anaerobic HM-dependent pentachlorophenol (PCP)-dechlorinating consortium and the chemical/electrochemical structures of HM. A lack of PCP dechlorination activity suggested no EEM function in the HM samples prepared as a soluble fraction in dimethyl sulfoxide and sulfuric acid (which did not contain any electric capacitance). Other HM samples exhibited EEM functionality as shown by the dechlorination activity ranging from 0.55 to 3.48 (µmol Cl−) L−1d−1. The comparison of dechlorination activity with chemical structural characteristics suggested that HM with EEM functionalities had predominantly aliphatic and carbohydrate carbons with the partial structures C=O, O=C–N, and O=C–O. EEM functionality positively correlated with the proportion of O=C–N and O=C–O, suggesting an association between peptidoglycan structure and EEM functionality. The lack of detection of a quinone structure in one HM sample with EEM functionality and a negative correlation with aromatic or C=C carbon suggested that the mechanism containing quinone structures is a minor component for the functionality of EEM.

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.

On the Crystal Chemistry of Inorganic Nitrides: Crystal-Chemical Parameters and Opportunities in the Exploration of Their Compositional Space

2020 ◽  
Author(s):  
Olivier Charles Gagné
Keyword(s):  
Functional Properties ◽  
A Priori ◽  
Lone Pair ◽  
Length Variation ◽  
Electronic Effects ◽  
Statistical Knowledge ◽  
Redox Active ◽  
Multiply Bonded ◽  
Jahn Teller ◽  
Compositional Space

The scarcity of nitrogen in Earth’s crust, combined with challenging synthesis, have made inorganic nitrides a relatively-unexplored class of compounds compared to their naturally-abundant oxide counterparts. To facilitate exploration of their compositional space via <i>a priori</i> modeling, and to help <i>a posteriori</i> structure verification not limited to inferring the oxidation state of redox-active cations, we derive a suite of bond-valence parameters and Lewis-acid strength values for 76 cations observed bonding to N<sup>3-</sup>, and further outline a baseline statistical knowledge of bond lengths for these compounds. We examine structural and electronic effects responsible for the functional properties and anomalous bonding behavior of inorganic nitrides, and identify promising venues for exploring uncharted compositional spaces beyond the reach of high-throughput computational methods. We find that many mechanisms of bond-length variation ubiquitous to oxide and oxysalt compounds (e.g., lone-pair stereoactivity, the Jahn-Teller and pseudo Jahn-Teller effects) are similarly pervasive in inorganic nitrides, and are occasionally observed to result in greater distortion magnitude than their oxide counterparts. We identify inorganic nitrides with multiply-bonded metal ions as a promising venue in heterogeneous catalysis, e.g. in the development of a post-Haber-Bosch process proceeding at milder reaction conditions, thus representing further opportunity in the thriving exploration of the functional properties of this emerging class of materials.<br>

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