Synthesis and Characterization of M + Co V 2 O 5 (M + = Li + , Na + , K + ) and Their Electrochemical Impedance Spectroscopic Studies

2017 ◽  
Vol 4 (11) ◽  
pp. 12291-12299
Author(s):  
Y.N. Vaidyanath ◽  
K.G. Ashamanjari ◽  
M. Mylarappa ◽  
M.S. Bhargava Ramu ◽  
K.R. Vishnu Mahesh ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Spectroscopic Studies ◽  
Synthesis And Characterization ◽  
Electrochemical Impedance Spectroscopic

scholarly journals Darstellung und Charakterisierung von chiralen und achiralen exocyclischen π-enyl-Komplexen der Zusammensetzung (C8H13PdCl)2 / Synthesis and Characterization of Exocyclic π-Enyl Complexes of the Composition (C8H13PdCl)2

1979 ◽  
Vol 34 (4) ◽  
pp. 579-584 ◽  
Author(s):  
Richard Ratka ◽  
Manfred L. Ziegler ◽  
Gerhard Schilling
Keyword(s):  
Spectroscopic Studies ◽  
Synthesis And Characterization ◽  
Mechanism Of Formation ◽  
H Nmr ◽  
Cleavage Reactions

Abstract The mechanism of formation of the exocyclic dimeric π-enyl complex (C8H13PdCl)2 by reaction of 1,3-dimethylenecyclohexane, C8H12 with trans-PdCl2(C6H5CN)2 is discussed. Through UV, 1H NMR (90 MHz, 360 MHz) and 13C spectroscopic studies it was possible to show that the dimer is formed by the disproportionate of C8H12 to C8H14 and m-xylene, and further that it consists of diastereomeric products. The reaction of (-) R-3-methyl-1-methylencyclohexane, C8H14, with the Pd-salt confirms that during the reaction between C8H12 and trans-PdCl2(C6H5CN)2 no free C8H14 is formed in solution.Studies on cleavage reactions of the dimer are also described in this paper.

Comparative Studies Regarding the Synthesis and Characterization of Cellulose Based-Polymer Assemblies for Fuel Cell Applications

2019 ◽  
Vol 957 ◽  
pp. 475-482
Author(s):  
Ioana Maior ◽  
Ana Maria Albu ◽  
Marius Stelian Popa
Keyword(s):  
Fuel Cell ◽  
Ionic Conductivity ◽  
Comparative Studies ◽  
Electrochemical Impedance ◽  
Molecular Size ◽  
Solid Polymer ◽  
Synthesis And Characterization ◽  
Fuel Cell Performance ◽  
Vis Spectroscopy

The aim of these comparative studies consists of synthesis and characterization of membrane assemblies from cellulose acetate (CelAc) and acrylic acid (AA), using as dopant in-situ generated pyrrole–aniline (Py–AN) copolymer intended for use in fuel cells fabrication. The synthesis was conducted through free radical polymerization in a semi-homogeneous system and the casting method was used to form the solid polymer membranes. In selecting the optimal compositional parameters, the influence of the molecular size of the majority matrix component was also observed. These membrane assemblies were studied using FT-IR spectroscopy, UV-Vis spectroscopy, and X-Ray diffraction analysis which highlighted the structure–composition dependence. With the electrochemical impedance spectroscopy the ionic conductivity of the membrane was determined, in order to evaluate the PEM fuel cell performance. In case of thicker membranes, there is an increase in ionic conductivity values over those of lower thickness, which is due to short-order structural order. Also, a superunitary Py:AN is more favorable to conductivity increase than a less than one ratio.

Synthesis and characterization of a hexaphyrin(1.0.1.0.0.0) bearing both meso- and β-substituents

2007 ◽  
Vol 11 (04) ◽  
pp. 287-293 ◽  
Author(s):  
Jonathan L. Sessler ◽  
Patricia J. Melfi ◽  
Vincent M. Lynch
Keyword(s):  
Crystal Structure ◽  
Ring Current ◽  
Spectroscopic Studies ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
H Nmr ◽  
Planar Conformation ◽  
Hydrogen Bound

The synthesis of an isoamethyrin-type expanded porphyrin bearing both meso- and β-substituents is presented. The diprotonated form of this macrocycle was characterized by conventional spectroscopic means and via a single crystal X-ray diffraction analysis. This species is observed to adopt a planar conformation in the solid state. Nonetheless, the inner ring current, as inferred from 1 H NMR spectroscopic studies, is found to be severely diminished as compared to isoamethyrin, by the presence of the two meso-phenyl moieties. A second crystal structure, in which a molecule of water is hydrogen-bound to a pyrrole NH , was also solved.

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