Synthesis, structure, redox property and ligand replacement reaction of ruthenium(II) complexes containing a terpyridyl ligand with a redox active moiety

Polyhedron ◽  
2010 ◽  
Vol 29 (4) ◽  
pp. 1337-1343 ◽  
Author(s):  
Dai Oyama ◽  
Masato Kido ◽  
Ai Orita ◽  
Tsugiko Takase
Keyword(s):  
Redox Property ◽  
Replacement Reaction ◽  
Active Moiety ◽  
Redox Active ◽  
Ligand Replacement

Trichloroacetate Affects the Redox Active Tyrosine 160 of the D2 Polypeptide of the Photosystem II Core

1997 ◽  
Vol 52 (11-12) ◽  
pp. 782-788 ◽  
Author(s):  
R. Li ◽  
N. Lin ◽  
C. Xu ◽  
Y. Shen ◽  
Keyword(s):  
Photosystem Ii ◽  
Redox Property ◽  
Obvious Effect ◽  
Redox Active ◽  
Treated Sample ◽  
Epr Signal ◽  
Epr Signal Ii ◽  
Small Hydrophobic

Abstract Trichloroacetate (TCA) affects the redox property of YD (tyrosine-160 on D2 polypeptide) after the removal of 33 kDa extrinsic polypeptide from the photosystem II (PSII) core. However, TCA has no obvious effect on the redox property of YZ , confirming that the environments around YZ and YD are quite different. The conclusion on the effects on YD is based primarily on the observation that Y D+ is not detected as the EPR signal IIslow when 33 kDa polypeptide is released by TCA -treatment. Dialysis of the TCA -treated sample that allows the rebinding of mostly 33 kDa polypeptide restores Y D+, showing that the loss of the EPR signal IIslow| takes place after the removal of 33 kD a polypeptide but not the release of manganese (Mn). Additionally, treatment of several halogenated acetates on Tris-washed PSII particles shows that the degree of their effects on suppressing EPR signal IIslow is correlated with their hydrophobicity. It is postulated that Y D becomes more accessible to some small hydrophobic molecules depending upon their hydrophobicity when 33 kDa poly­peptide is removed.

A luminescent edge-interlocked prismatic heteroleptic metallocage assembled through a ligand replacement reaction

2019 ◽  
Vol 55 (80) ◽  
pp. 11992-11995 ◽  
Author(s):  
Shun-Ze Zhan ◽  
Jing-Hong Li ◽  
Guo-Hui Zhang ◽  
Xiao-Wei Liu ◽  
Mian Li ◽  
...  
Keyword(s):  
Replacement Reaction ◽  
Ligand Replacement

A luminescent edge-interlocked heteroleptic metallocages based on Cu3(pyrazolate)3 was prepared through a ligand replacement reaction from a homoleptic metallocage and a new ligand.

Metal-carboxylate coordination polymers with redox-active moiety of tetrathiafulvalene (TTF)

2011 ◽  
Vol 40 (9) ◽  
pp. 1977 ◽  
Author(s):  
Qin-Yu Zhu ◽  
Jin-Po Wang ◽  
Yu-Rong Qin ◽  
Zheng Shi ◽  
Qiong-Hua Han ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Metal Carboxylate ◽  
Active Moiety ◽  
Redox Active

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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