scholarly journals Electrosynthesis and Spectroscopic Characterization of Poly(o-Aminophenol) Film Electrodes

2012 ◽  
Vol 2012 ◽  
pp. 1-26 ◽  
Author(s):  
Ricardo Tucceri ◽  
Pablo Arnal ◽  
Alberto Scian
Keyword(s):  
Electrochemical Synthesis ◽  
Spectroscopic Data ◽  
Chemical Structure ◽  
Electrode Materials ◽  
Spectroscopic Characterization ◽  
Spectroscopic Studies ◽  
Formation Mechanisms ◽  
The Third ◽  
Basic Solutions

This review, which is divided into three parts, concerns electrochemical synthesis, spectroscopic characterization, and formation mechanisms of poly(o-aminophenol) (POAP) film electrodes. The first part of this review is devoted to describe the electropolymerization process of o-aminophenol on different electrode materials and in different electrolyte media by employing both potentiodynamic and potentiostatic methods. The second part refers to spectroscopic studies carried out by different authors to both, identify the products of the o-aminophenol electrooxidation and elucidate the chemical structure of poly(o-aminophenol) film electrodes. The third part shows the different mechanisms formulated to interpret the POAP films formation from both acid and basic solutions of o-AP. Also, some electrochemical and spectroscopic data which allowed to propos the corresponding formation mechanisms, especially in basic media, are described.

Poly(o-aminophenol) film electrodes: synthesis and characterization and formation mechanisms — A review article

2013 ◽  
Vol 91 (2) ◽  
pp. 91-112 ◽  
Author(s):  
R. Tucceri ◽  
P.M. Arnal ◽  
A.N. Scian
Keyword(s):  
Chemical Structure ◽  
Electrode Materials ◽  
Film Formation ◽  
Protective Layer ◽  
Spectroscopic Characterization ◽  
Spectroscopic Studies ◽  
Formation Mechanisms ◽  
Neutral Media ◽  
Electro Oxidation ◽  
Basic Solutions

This review, which is divided into three parts, concerns electrochemical synthesis, spectroscopic characterization, and formation mechanisms of poly(o-aminophenol) (POAP) film electrodes. The first part of this review is devoted to describing the electropolymerization process of o-aminophenol (o-AP) on different electrode materials and in different electrolyte media by employing both potentiodynamic and potentiostatic methods. The evolution of the voltammogram during the electrosynthesis of POAP and the assignation of the voltammetric peaks to different species, according to the formation mechanism formulated by each author, are described. The effects of some chemical substances and electrochemical pretreatments of the electrode surface, on the electropolymerization process of o-AP, are also considered in this part of the review. The synthesis of POAP in neutral media, which yields a nonconducting polymer, and its use as component of biosensors and protective layer in corrosion processes, are analyzed at the end of the first part. The second part of this review refers to spectroscopic studies carried out by different authors to both identify the products of the o-AP electro-oxidation and elucidate the chemical structure of POAP film electrodes. This second part of the review also describes the different spectroscopic methods employed to study the redox process of POAP, which allows the demonstration of the existence of transient species during the transition of the completely oxidized form of POAP to the completely reduced one. The third part of this review shows the different mechanisms formulated to interpret the POAP film formation from both acid and basic solutions of o-AP. Also, some electrochemical and spectroscopic data which allowed to propos the corresponding formation mechanisms, especially in basic media, are described.

scholarly journals SYNTHESIS AND SPECTROSCOPIC CHARACTERIZATION OF SOME NEW HYDROGENOXALATO ORGANOTIN (IV) COMPLEXES

2020 ◽  
Vol 26 (2) ◽  
pp. 15-19
Author(s):  
MOUHAMADOU SEMBENE BOYE ◽  
AMINATA DIASSE-SARR ◽  
LIBASSE DIOP
Keyword(s):  
Hydrogen Bonds ◽  
Spectroscopic Data ◽  
Spectroscopic Characterization ◽  
Spectroscopic Studies ◽  
Supramolecular Architectures ◽  
Polymeric Structures

The synthesis and spectroscopic studies (infrared and Mössbauer) of new hydrogenoxalato derivatives and adducts containing SnRn (R=Me, Ph; n=2, 3) residues are reported. Based on their spectroscopic data dimeric and polymeric structures containing hexacoordinated or pentacoordinated Sn are suggested, the hydrogenoxolate anion behaving as a monocoordinating or a monochelating ligand. In two studied adducts, supramolecular architectures may be obtained when extra hydrogen bonds involving the free NH groups are considered.

Chemical and Spectroscopic Characterization of Humic Acids Extracted from Filter Cake using Different Basic Solutions

Sugar Tech ◽  
2019 ◽  
Vol 22 (2) ◽  
pp. 311-318
Author(s):  
Hamid Reza Behravan ◽  
Paul Voroney ◽  
Reza Khorassani ◽  
Amir Fotovat ◽  
Abdol Amir Moezei ◽  
...  
Keyword(s):  
Humic Acids ◽  
Filter Cake ◽  
Spectroscopic Characterization ◽  
Basic Solutions

scholarly journals Spectroscopic Characterization of Poly(ortho-Aminophenol) Film Electrodes: A Review Article

2013 ◽  
Vol 2013 ◽  
pp. 1-26 ◽  
Author(s):  
Ricardo Tucceri ◽  
Pablo Maximiliano Arnal ◽  
Alberto Néstor Scian
Keyword(s):  
Spectroscopic Characterization ◽  
Spectroscopic Studies ◽  
Review Article ◽  
Electro Oxidation ◽  
Redox Conversion

This paper refers to spectroscopic studies carried out to identify the products ofo-aminophenol electro-oxidation and elucidate the structure of electrochemically synthesized poly(o-aminophenol) (POAP) films. Spectroscopic studies of the redox conversion of POAP are also reviewed.

scholarly journals Functional, structural, and spectroscopic characterization of a glutathione-ligated [2Fe–2S] cluster in poplar glutaredoxin C1

2007 ◽  
Vol 104 (18) ◽  
pp. 7379-7384 ◽  
Author(s):  
Nicolas Rouhier ◽  
Hideaki Unno ◽  
Sibali Bandyopadhyay ◽  
Lluis Masip ◽  
Sung-Kun Kim ◽  
...  
Keyword(s):  
Intracellular Localization ◽  
Spectroscopic Characterization ◽  
Spectroscopic Studies ◽  
Iron Sulfur Cluster ◽  
X Ray Crystallography ◽  
Iron Sulfur ◽  
Catalytic Cysteine ◽  
A Subunit ◽  
Stress Sensing

When expressed in Escherichia coli, cytosolic poplar glutaredoxin C1 (CGYC active site) exists as a dimeric iron–sulfur-containing holoprotein or as a monomeric apoprotein in solution. Analytical and spectroscopic studies of wild-type protein and site-directed variants and structural characterization of the holoprotein by using x-ray crystallography indicate that the holoprotein contains a subunit-bridging [2Fe–2S] cluster that is ligated by the catalytic cysteines of two glutaredoxins and the cysteines of two glutathiones. Mutagenesis data on a variety of poplar glutaredoxins suggest that the incorporation of an iron–sulfur cluster could be a general feature of plant glutaredoxins possessing a glycine adjacent to the catalytic cysteine. In light of these results, the possible involvement of plant glutaredoxins in oxidative stress sensing or iron–sulfur biosynthesis is discussed with respect to their intracellular localization.

Electrochemical synthesis and spectroscopic characterization of a mercury–platinum–hydride complex

2000 ◽  
Vol 300-302 ◽  
pp. 645-652 ◽  
Author(s):  
Julian A Davies ◽  
Cassandra T Eagle ◽  
David G Farrar ◽  
Pannee Burckel
Keyword(s):  
Electrochemical Synthesis ◽  
Spectroscopic Characterization ◽  
Hydride Complex

scholarly journals The Electrophoretic and Spectroscopic Characterization of Hgb M

Blood ◽  
1958 ◽  
Vol 13 (10) ◽  
pp. 936-949 ◽  
Author(s):  
PARK S. GERALD
Keyword(s):  
Relative Concentration ◽  
Spectroscopic Characterization ◽  
Spectroscopic Studies ◽  
Spectral Curves ◽  
Spectral Changes ◽  
Electrophoretic Behavior ◽  
Patient Reported ◽  
High Concentrations

Abstract The hemoglobin (hgb) from a patient with Hgb M disease was resolved into two components by starch block electrophoresis (at pH 7.0-7.2) of the oxidized hemolyzate. One component was identified electrophoretically and spectroscopically as Hgb A, and the other as Hgb M. Methods for the determination of the relative concentration of Hgb M were given. In the patient reported, Hgb M was found to comprise approximately 30 per cent of the total hgb. Spectroscopic studies of electrophoreticably isolated Hgb M demonstrated that both the methgb and the cyanmethgb form were abnormal in their spectral curves. The reactions of the methgb form with low and high concentrations of cyanide were found to differ. The nature of the spectral changes were such as to indicate that some of the heme groups of the methgb form react abnormally and others apparently normally. The electrophoretic behavior of the patient’s hemolyzate after treatment with various combinations of cyanide and ferricyanide was consistent with this hypothesis. The differing reactivity of the heme groups was explained in the light of the biochemical genetics of the abnormal hemoglobins.

scholarly journals Cu+-specific CopB transporter: Revising P1B-type ATPase classification

2018 ◽  
Vol 115 (9) ◽  
pp. 2108-2113 ◽  
Author(s):  
Rahul Purohit ◽  
Matthew O. Ross ◽  
Sharon Batelu ◽  
April Kusowski ◽  
Timothy L. Stemmler ◽  
...  
Keyword(s):  
Maximal Activity ◽  
Spectroscopic Characterization ◽  
Spectroscopic Studies ◽  
Divalent Metal Ions ◽  
X Ray ◽  
Reducing Environment ◽  
Methionine Residues ◽  
Cellular Copper ◽  
X Ray Absorption

The copper-transporting P1B-ATPases, which play a key role in cellular copper homeostasis, have been divided traditionally into two subfamilies, the P1B-1-ATPases or CopAs and the P1B-3-ATPases or CopBs. CopAs selectively export Cu+ whereas previous studies and bioinformatic analyses have suggested that CopBs are specific for Cu2+ export. Biochemical and spectroscopic characterization of Sphaerobacter thermophilus CopB (StCopB) show that, while it does bind Cu2+, the binding site is not the prototypical P1B-ATPase transmembrane site and does not involve sulfur coordination as proposed previously. Most important, StCopB exhibits metal-stimulated ATPase activity in response to Cu+, but not Cu2+, indicating that it is actually a Cu+ transporter. X-ray absorption spectroscopic studies indicate that Cu+ is coordinated by four sulfur ligands, likely derived from conserved cysteine and methionine residues. The histidine-rich N-terminal region of StCopB is required for maximal activity, but is inhibitory in the presence of divalent metal ions. Finally, reconsideration of the P1B-ATPase classification scheme suggests that the P1B-1- and P1B-3-ATPase subfamilies both comprise Cu+ transporters. These results are completely consistent with the known presence of only Cu+ within the reducing environment of the cytoplasm, which should eliminate the need for a Cu2+ P1B-ATPase.

Preparation, Crystal Structure and Spectroscopic Characterization of [Ga(OH)(SO4)(terpy)(H2O)] · H2O (terpy=2,2’:6’,2-Terpyridine): The First Characterized Gallium(III) Sulfato Complex

2004 ◽  
Vol 59 (3) ◽  
pp. 291-297 ◽  
Author(s):  
Andreas Sofetis ◽  
Giannis S. Papaefstathiou ◽  
Aris Terzis ◽  
Catherine P. Raptopoulou ◽  
Theodoros F. Zafiropoulos
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Nmr Spectroscopy ◽  
Good Yield ◽  
Spectroscopic Data ◽  
Spectroscopic Characterization ◽  
X Ray ◽  
X Ray Crystallography ◽  
H Nmr

The reaction of Ga2(SO4)3·18H2O and excess 2,2′:6′,2″-terpyridine (terpy) in MeOH / H2O leads to [Ga(OH)(SO4)(terpy)(H2O)]·H2O (1·H2O] in good yield. The structure of the complex has been determined by single-crystal X-ray crystallography. The GaIII atom in 1·H2O is 6-coordinate and ligation is provided by one terdentate terpy molecule, one monodentate sulfate, one terminal hydroxide and one terminal H2O molecule; the coodination polyhedron about the metal is described as a distorted octahedron. There is an extensive hydrogen-bonding network in the crystal structure which generates corrugated layers parallel to bc. The new complex was characterized by IR and 1H NMR spectroscopy. The spectroscopic data are discussed in terms of the nature of bonding

Topological Characterization of the Third Type of Triangular Hex-derived Networks

2021 ◽  
Vol 31 (2) ◽  
pp. 145-161
Author(s):  
Shibsankar Das ◽  
◽  
Shikha Rai ◽  
Keyword(s):  
Chemical Structure ◽  
Recent Literature ◽  
Chemical Properties ◽  
Topological Indices ◽  
Topological Characterization ◽  
The Third ◽  
Chemical Descriptor ◽  
Different Dimensions ◽  
And Chemical Properties

A topological index is a numerical quantity that defines a chemical descriptor to report several physical, biological and chemical properties of a chemical structure. In recent literature, various degree-based topological indices of a molecular structure are easily calculated by deriving a M-polynomial of that structure. In this paper, we first determine the expression of a M-polynomial of the triangular Hex-derived network of type three of dimension n and then obtain the corresponding degree-based topological indices from the closed form of M-polynomial. In addition, we use Maple software to represent the M-polynomial and the concerned degree-based topological indices pictorially for different dimensions.

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