Azulenium cations. An experimental and theoretical study of the cations derived from hydrocarbon derivatives of azulene

1985 ◽  
Vol 63 (7) ◽  
pp. 2081-2085 ◽  
Author(s):  
J. W. Lewis ◽  
R. V. Nauman
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Ambient Temperature ◽  
Sulfuric Acid Solution ◽  
Theoretical Study ◽  
Electronic States ◽  
Experimental Results ◽  
Luminescence Spectra ◽  
First Time ◽  
Derivatives Of

The ambient temperature ultraviolet absorption and the 77 K luminescence spectra of a series of four hydrocarbon derivatives of azulene in sulfuric acid solution are presented and discussed in detail. CNDO/S calculations have been carried out and the calculational results are compared with the experimental results. The phosphorescences of these cationic species are reported for the first time. The present results suggest that an inversion in the order of electronic states is perhaps responsible for the normal emissions of the protonated species and the anomalous emissions of the parent molecules.

Experimental and Theoretical Study on the Corrosion Inhibition of Mild Steel by 1-Octyl-3-methylimidazolium l-Prolinate in Sulfuric Acid Solution

2014 ◽  
Vol 53 (42) ◽  
pp. 16349-16358 ◽  
Author(s):  
Xingwen Zheng ◽  
Shengtao Zhang ◽  
Min Gong ◽  
Wenpo Li
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Sulfuric Acid Solution ◽  
Theoretical Study

Sputter deposition of a corrosion-resistant amorphous metallic coating

1988 ◽  
Vol 3 (5) ◽  
pp. 862-871 ◽  
Author(s):  
Natalia L. Lee ◽  
Galen B. Fisher ◽  
Robert Schulz
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Ambient Temperature ◽  
Sulfuric Acid Solution ◽  
Steel Substrate ◽  
Amorphous Film ◽  
Sputter Deposition ◽  
Low Carbon ◽  
Corrosion Resistant

Starting with corrosion-resistant amorphous Fe32Ni36Cr14P12B6 alloy material, rf sputter deposition has been successfully used to deposit amorphous thin films very similar in composition onto low-carbon (i.e., 1008) steel. The effects that varying sputter deposition parameters has on a film's corrosion resistance, microstructure, and chemical composition have been examined. Optical, scanning, and transmission electron microscopy, Auger depth profiling, and x-ray diffraction were used to characterize the microstructure and composition of the films, while the corrosion resistance was determined by anodic polarization in basic and acidic solutions. A ∼4000 Å thick amorphous film sputtered at ambient temperature onto a 0.05 μm polished 1008 steel substrate improved the corrosion resistance of the steel in a buffered borate solution by lowering the steel's critical current density by two orders of magnitude and by raising its corrosion potential by ∼0.4 V. Bias voltage sputtering was required to produce a film with properties that could withstand a sulfuric acid solution. For example, a film sputtered at – 70 V at ambient temperature onto a steel substrate passivated in sulfuric acid solution, whereas the steel was completely active in this solution without the sputtered film. Passive current densities in this case were ∼2x102μA/cm2. In both solutions the improved corrosion resistance was exhibited by films with lower oxygen content and a denser microstructure. Thus a direct correlation between corrosion resistance, microstructure, and composition is shown.

The Phthalimidomethyl Rearrangement

1990 ◽  
Vol 43 (11) ◽  
pp. 1817 ◽  
Author(s):  
JFK Wilshire
Keyword(s):  
Sulfuric Acid ◽  
Nitrogen Atom ◽  
Carbon Atom ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Hindered Rotation ◽  
Initial Location ◽  
Concentrated Sulfuric Acid ◽  
Derivatives Of

The discovery of a new acid-catalysed monodentate N → C aromatic rearrangement, namely the phthalimidomethyl rearrangement, is reported. In this rearrangement, discovered during the reaction of N-hydroxymethylphthalimide with certain alkyl N-(4-nitrophenyl)carbamates in concentrated sulfuric acid solution, the phthalimidomethyl group migrates from its initial location on the nitrogen atom of the carbamate function to a carbon atom of the nitrophenyl group. Evidence, provided by an appropriate 'crossover' experiment, indicates that the rearrangement is intermolecular. Hindered rotation about the N(carbamoyl)-aryl bond of the N-phthalimidomethyl derivatives of both ethyl and methyl N-(2,4-dinitrophenyl)carbamate is reported.

scholarly journals Potential modulation reflectance of passivated type 304 stainless steel in sulfuric acid solution

2012 ◽  
Vol 60 ◽  
pp. 384-391 ◽  
Author(s):  
Toshiaki Ohtsuka ◽  
Atsushi Hyono ◽  
Yuki Sasaki
Keyword(s):  
Stainless Steel ◽  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
304 Stainless Steel ◽  
Type 304 ◽  
Type 304 Stainless Steel
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