Reactions of nitrogen oxides with heme models. Low temperature spectral characterization of the unstable nitrato-nitrosyl complex FeIII(TPP)(ONO2)(NO)Electronic supplementary information (ESI) available: IR and UV-Visible spectra of A. See http://www.rsc.org/suppdata/cc/b3/b302061d/

2003 ◽  
pp. 1706 ◽  
Author(s):  
Tigran S. Kurtikyan ◽  
Garik G. Martirosyan ◽  
Manya E. Hakobyan ◽  
Peter C. Ford
Keyword(s):  
Low Temperature ◽  
Nitrogen Oxides ◽  
Spectral Characterization ◽  
Supplementary Information ◽  
Nitrosyl Complex ◽  
Visible Spectra ◽  
Electronic Supplementary Information ◽  
Uv Visible

Spectroelectrochemical characterization of meso triaryl-substituted Mn(IV), Mn(III) and Mn(II) corroles. Effect of solvent and oxidation state on UV-visible spectra and redox potentials in nonaqueous media

2014 ◽  
Vol 18 (12) ◽  
pp. 1131-1144 ◽  
Author(s):  
Bingbing Gao ◽  
Zhongping Ou ◽  
Xueyan Chen ◽  
Shi Huang ◽  
Bihong Li ◽  
...  
Keyword(s):  
Anion Radical ◽  
Cation Radical ◽  
Oxidation Mechanism ◽  
Central Metal ◽  
Redox Potentials ◽  
Nonaqueous Media ◽  
Visible Spectra ◽  
Phenyl Rings ◽  
Uv Visible

Two series of substituted manganese triarylcorroles were synthesized and characterized as to their electrochemical and spectroelectrochemical properties in CH 2 Cl 2, CH 3 CN and pyridine. The investigated compounds are represented as ( YPh )3 CorMn III and ( YPh )3 CorMn IV Cl , where Cor is a trianion of the corrole and Y is a Cl , F , H or CH 3 para-substituent on the three phenyl rings of the macrocycle. Each neutral Mn(III) corrole exists as a four-coordinate complex in CH 2 Cl 2 and CH 3 CN and as a five-coordinate species in pyridine. ( YPh )3 CorMn III undergoes two oxidations to stepwise generate a Mn(IV) corrole and a Mn(IV) π-cation radical. It also undergoes one reduction to generate a Mn(II) corrole in CH 2 Cl 2 or CH 3 CN . In contrast, the reduction of ( YPh )3 CorMn III leads to a Mn(III) corrole π-anion radical in pyridine. One oxidation is observed for ( YPh )3 CorMn IV Cl in CH 2 Cl 2 and CH 3 CN to generate a Mn(IV) corrole π-cation radical while Mn(III) and Mn(II) corroles are stepwise formed after reduction of the same compound. The second reduction of ( YPh )3 CorMn IV Cl in pyridine gives a Mn(III) π-anion radical as opposed to a Mn(II) corrole with an unreduced π-ring system. The neutral, reduced and oxidized forms of each corrole were characterized by electrochemistry and UV-visible spectroelectrochemistry and comparisons are made between the UV-visible spectra and redox potentials of the compounds in different central metal oxidation states. An overall reduction/oxidation mechanism in the three solvents is proposed.

scholarly journals Characterization of Cu(II)-ACC Complexes and Conversion of the Bound ACC into Ethylene in the Presence of Hydrogen Peroxide. Detection of a Brown Intermediate at Low Temperature

2007 ◽  
Vol 2007 ◽  
pp. 1-9 ◽  
Author(s):  
Wadih Ghattas ◽  
Michel Giorgi ◽  
Christian Gaudin ◽  
Antal Rockenbauer ◽  
Marius Réglier ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Low Temperature ◽  
Absorption Band ◽  
Acc Oxidase ◽  
Optimum Activity ◽  
Hydrogen Peroxide Detection ◽  
Crystallographic Structures ◽  
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Reaction In Water

Two copper(II)-ACC complexes were prepared and characterized: [Cu(bpy)(ACC)(H2O)]⋅CO4(1) and[Cu(ACC)2]3⋅4H2O(2). Their crystallographic structures are described and analyzed. Spectroscopic characterizations (UV-visible and EPR) confirm that the structure is maintained in solution. These complexes are able to produce ethylene in the presence of hydrogen peroxide in an “ACC Oxidase-like” reaction in water and in methanol. The conversion of ACC into ethylene depends on the amount of base, and, in methanol, 3 equivalents of NaOH are needed for optimum activity. The base is proposed to play a role inH2O2deprotonation. The presence of an exogenic ligand (bpy) is important for the reactivity and may stabilize a reaction intermediate. Indeed, a brown intermediate with an absorption band centered at 433 nm can be detected at low temperature when1is treated with 10 equivalents ofH2O2.

SYNTHESIS AND CHARACTERIZATION OF THIOPHENE-CONTAINING CHROMOPHORES FOR NONLINEAR OPTICAL (NLO) MATERIALS

2008 ◽  
Vol 17 (03) ◽  
pp. 243-254 ◽  
Author(s):  
ZUOSEN SHI ◽  
XIAOLONG ZHANG ◽  
ZHANCHEN CUI
Keyword(s):  
Absorption Maximum ◽  
Nonlinear Optical ◽  
Synthesis And Characterization ◽  
Knoevenagel Reaction ◽  
Scanning Calorimetry ◽  
Visible Spectra ◽  
Nlo Materials ◽  
Ft Ir ◽  
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A series of chromophores based on benzene and thiophene moieties as π-conjugating spacers were designed and synthesized by Horner-Emmons-Wadsworth reaction and Vilsmeier-Haack reaction, followed by Knoevenagel reaction with different electron acceptors. Their structures were confirmed by 1HNMR, FT-IR, HPLC-Ms, UV-visible spectra, and the thermal properties were characterized by differential scanning calorimetry (DSC). Solvatochromic method was used to measure their nonlinear optical properties. The variation of chromophoric structures on NLO properties was investigated, indicating that the cyano substitution on the vinylene bridge of the chromophore produces a considerable red-shift of the absorption maximum, and would greatly enhance the molecular quadratic hyperpolarizability (βμ).

scholarly journals Synthesis and Characterization of Some New Metals Complexes of [N-(4-Nitrobenzoyl Amino)-Thioxomethyl] Phenylalanine

2016 ◽  
Vol 13 (1) ◽  
pp. 113-121
Author(s):  
Baghdad Science Journal
Keyword(s):  
Molecular Structure ◽  
Magnetic Susceptibility ◽  
Palladium Complexes ◽  
Synthesis And Characterization ◽  
Conductivity Measurements ◽  
Tetrahedral Geometry ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible

A new ligand [N-(4-nitrobenzoylamino)-thioxomethyl] phenylalanine is synthesized by reaction of 4-nitrobenzoyl isothiocyanate with phenylalanine (1:1). It is characterized by micro elemental analysis (C.H.N.S.), FT-IR, (UV-Vis) and 1H and 13CNMR spectra. Some metals ions complexes of this ligand were prepared and characterized by FT-IR, UV-Visible spectra, conductivity measurements, magnetic susceptibility and atomic absorption. From results obtained, the following formula [M(NBA)2] where M2+ = Mn, Co, Ni, Cu, Zn, Pd, Cd and Hg, the proposed molecular structure for these complexes as tetrahedral geometry, except copper and palladium complexes are have square planer geometry.

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