Photoionization of Benzophenone Carboxylic Acids in Aqueous Solution. A FT EPR and Optical Spectroscopy Study of Radical Cation Decay

1996 ◽  
Vol 100 (46) ◽  
pp. 18101-18107 ◽  
Author(s):  
J. Säuberlich ◽  
O. Brede ◽  
D. Beckert
Keyword(s):  
Aqueous Solution ◽  
Carboxylic Acids ◽  
Radical Cation ◽  
Optical Spectroscopy ◽  
Spectroscopy Study

1H NMR AND OPTICAL SPECTROSCOPY STUDY OF THE RADIODOSIMETRIC PROPERTIES OF THE PIRA GEL

2001 ◽  
Vol 34 (5) ◽  
pp. 549-567
Author(s):  
G. Zebrowska ◽  
Cz. Lewa ◽  
J. de Certaines
Keyword(s):  
Optical Spectroscopy ◽  
1H Nmr ◽  
Spectroscopy Study

Uranyl(VI) complexes with alpha-substituted carboxylic acids in aqueous solution

2003 ◽  
Vol 91 (1) ◽  
Author(s):  
H. Moll ◽  
G. Geipel ◽  
T. Reich ◽  
G. Bernhard ◽  
Th. Fanghänel ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Complex Formation ◽  
Carboxylic Acids

SummaryThe complex formation in the binary uranium(VI)-glycolate, -

scholarly journals EPR Spectroscopy Study of the Radical Cation Cluster (η⁵-C₅H₅)(CO)₅ReFePt(μ₃-C=CHPh)(η²-Ph₂P(CH₂)₂PPh₂)

2019 ◽  
pp. 573-579
Author(s):  
Nikolay G. Maksimov ◽  
Victor V. Verpekin ◽  
Dmitry V. Zimonin ◽  
Galina V. Burmakina ◽  
Oleg S. Chudin ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Low Temperature ◽  
Radical Cation ◽  
Unpaired Electron ◽  
Iron Atom ◽  
Epr Spectroscopy ◽  
Binuclear Complex ◽  
Chemical Oxidation ◽  
Spectroscopy Study ◽  
Model Spectrum

The chemical oxidation of the cluster CpReFePt(μ3-C=CHPh)(CO)5(dppe) (Cp = η5-C5H5, dppe = η2- Ph2P(CH2)2PPh2) resulted in a radical cation [CpReFePt(μ3-C=CHPh)(CO)5(dppe)]+• that is sufficiently stable only at low temperature. An electronic structure of the radical cation was studied by EPR and following parameters were obtained by comparison of the experimental and model spectrum: gx = 2.070 gy = 2.0295 gz = 1.997; Ax(31P) = 17 Ay(31P) = 49 Az(31P) = 35 (Gs);Ax(195Pt) = 62 Ay(195Pt) = 45 Az(195Pt) = 105 (Gs). An unpaired electron is seen to be mainly concentrated on the iron atom (85-90%) and partially on the platinum atom (10-15%). Further transformation of the radical cation led to the formation of the binuclear complex Cp(CO)2RePt(μ-C=CHPh)(dppe) and the Fe-carbonyl fragment

scholarly journals EFFECT OF RADICAL SCAVENGERS AND PROPOSED PATHWAYS FOR DEGRADATION OF AZO DYE IN AQUEOUS SOLUTION UNDER PRESENCE OF IRON(III) AND PERSULPHATE

2017 ◽  
Vol 60 (4) ◽  
pp. 88
Author(s):  
Heng Zhong ◽  
Hui Zhao ◽  
Jun Li ◽  
Lei Sun ◽  
Aihua Xu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Carboxylic Acids ◽  
Azo Dye ◽  
Water Discharge ◽  
Radical Scavenging ◽  
Degradation Process ◽  
Ionization Mass ◽  
Radical Scavengers ◽  
Acid Orange 7 ◽  
Degradation Of Azo Dye

The degradation process of Acid Orange 7 (AO7) in aqueous solutions by iron(III) under activation by persulfate (PS, S2O82-) oxidation and Visible (Vis) light (≥420 nm) exposure has been studied. The radical scavenging effect was examined by using ethanol (EtOH), tert-butyl alcohol (TBA) and sodium azide to state that the hydroxyl radical (·OH) is regarded as the predominant reactive oxidant for the AO7 decolorization, while the sulfate radical (SO4·-) and singlet oxygen(1O2) are also make their contribution to dye's degradation. The reaction intermediates were determined by electrospray ionization-mass spectrometry (ESI-MS) analysis, and a probable degradation pathway mechanism has been proposed. It was suggested, that firstly an initial successive radical attacks the N atom of the dye, which decompose to p-phenolsulfonic acid and 1,2-naphthaquinone through the contemporaneous break of two C-N bonds. Afterwards, subsequent oxidation of these products and loss of the −SO3− group are observed. Finally, the acyclic carboxylic acids are formed from the central ring-opening, and then the further oxidation to simple carboxylic acids is evident. The work can provide a simple, effective and economic system for the treatment of non-biodegradable azo dye. The recommendations were proposed on organization of an effective quality control of technological water discharge and products of its processing at the local wastewater treatment facilities of industrial plants for prevention of the ingress of hazardous biological substances to the hydrosphere.Forcitation:Heng Zhong, Hui Zhao, Jun Li, Lei Sun, Aihua Xu, Dongsheng Xia, Nevsky A.V. Effect of radical scavengers and proposed pathways for degradation of azo dye in aqueous solution under presence of iron (III) and persulphate. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 4. P. 88-94.

Optical spectroscopy study of YVO4:Eu3+ nanopowders prepared by the proteic sol–gel route

2015 ◽  
Vol 42 ◽  
pp. 45-51 ◽  
Author(s):  
B.F. dos Santos ◽  
R.M. Araujo ◽  
M.E.G. Valerio ◽  
M.V. dos S. Rezende
Keyword(s):  
Optical Spectroscopy ◽  
Sol Gel ◽  
Spectroscopy Study

Optical spectroscopy study of damage evolution in 6H-SiC by H2 + implantation

2021 ◽  
Author(s):  
Yong Wang ◽  
Qing Liao ◽  
Ming Liu ◽  
Peng-Fei Zheng ◽  
Xinyu Gao ◽  
...  
Keyword(s):  
Optical Spectroscopy ◽  
Damage Evolution ◽  
Spectroscopy Study
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