Coordination Compounds of Olefins with Anhydrous Silver Tetrafluoroborate. VI. Complexes with Vinyl Chloride and Vinyl Fluoride

1971 ◽  
Vol 49 (9) ◽  
pp. 1323-1327 ◽  
Author(s):  
H. W. Quinn ◽  
R. L. Vangilder
Keyword(s):  
Dipole Moment ◽  
Vinyl Chloride ◽  
Coordination Compounds ◽  
Silver Ion ◽  
Permanent Dipole Moment ◽  
Vinyl Fluoride ◽  
Lower Stability ◽  
The Stability

The stability of the complexes AgBF4•2 vinyl chloride and AgBF4•2 vinyl fluoride has been determined and compared with that of AgBF4•2 propylene. The much lower stability of the halo-olefin complexes has been attributed partly to weaker interaction of these less basic olefins with the silver ion and partly to configurational restrictions imposed upon the complexed halo-olefin molecules as a result of their higher permanent dipole moment.

scholarly journals Rust Conversion Performance of Phosphoric Acid-Gallic Acid in Vinyl Chloride Acrylic Emulsion

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 152
Author(s):  
Xin Wang ◽  
Qingjun Zhu ◽  
Xiangju Liu ◽  
Baorong Hou
Keyword(s):  
Phosphoric Acid ◽  
Gallic Acid ◽  
Vinyl Chloride ◽  
Salt Spray ◽  
Corrosion Current ◽  
Oxidation Reactions ◽  
Acrylic Emulsion ◽  
Conversion Performance ◽  
The Stability ◽  
Iron Complexation

This work studied the application of phosphoric acid-gallic acid in vinyl chloride acrylic emulsion and its rust conversion performance. The increase of phosphoric acid affected the stability of the system, leading to the rapid precipitation of flocculent precipitation. Rust conversion coating (RCC) showed the best synergistic conversion effect when gallic acid (GA) was 0.2 wt.% and phosphoric acid (PA) was 2 wt.%. XRD and FTIR analysis show that the components of adherent rust (AR) are α-FeOOH, γ-FeOOH and Fe3O4. The conversion products are ferric phosphate (FP) and ferric gallate (FG). The RCC can effectively treat the rusted steel (RS) produced by simulated marine atmospheric corrosion. The corrosion current density was reduced by three orders of magnitude, the adhesion reached 2.75 MPa, and the salt spray corrosion resistance was 20 days. The results of Raman, XPS, SEM and EDS show that the ionic dissolution of iron, complexation and further oxidation reactions occur at the interface between the adherent rust and the RCC. After rust conversion treatment, unreacted rust (UR) affects the further improvement of adhesion strength and anti-corrosion performance.

The permanent dipole moment of ScF

1991 ◽  
Vol 176 (3-4) ◽  
pp. 303-308 ◽  
Author(s):  
Benoit Simard ◽  
Michael Vasseur ◽  
Peter A. Hackett
Keyword(s):  
Dipole Moment ◽  
Permanent Dipole Moment

scholarly journals The Role of Polarizabilities in the Fluorescence Behaviour of 4-cyano-N,N-dimethylaniline

1981 ◽  
Vol 36 (8) ◽  
pp. 868-875 ◽  
Author(s):  
Wolfram Baumann
Keyword(s):  
Dipole Moment ◽  
Electric Field ◽  
External Electric Field ◽  
Ground State ◽  
Permanent Dipole Moment ◽  
Reaction Field

Abstract The effect of an external electric field on the absorption and the double fluorescence of 4-cyano-N,N-dimethylaniline can be understood, taking into account reaction field induced polarizability effects. If a TICT state conformation emits the a-fiuorescence in dioxane, the permanent dipole moment in this state is only slightly larger than in the equilibrium ground state.

scholarly journals Enhanced Thermostability of a Fungal Alkaline Protease by Different Additives

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Nilesh P. Nirmal ◽  
R. Seeta Laxman
Keyword(s):  
High Activity ◽  
Ammonium Sulphate ◽  
Alkaline Protease ◽  
Residual Activity ◽  
Fungal Strain ◽  
Sugar Alcohols ◽  
Peg 6000 ◽  
Lower Stability ◽  
The Stability ◽  
Marginal Improvement

A fungal strain (Conidiobolus brefeldianus MTCC 5184) isolated from plant detritus secreted a high activity alkaline protease. Thermostability studies of the fungal alkaline protease (FAP) revealed that the protease is stable up to 50°C with 40% residual activity after one hour. Effect of various additives such as sugars, sugar alcohols, polyols, and salts, on the thermostability of FAP was evaluated. Among the additives tested, glycerol, mannitol, xylitol, sorbitol, and trehalose were found to be very effective in increasing the stability of FAP, which was found to be concentration dependent. Fivefold increase in residual activity of FAP was observed in the presence of trehalose (50%) and sorbitol (50%) at 50°C for 4 h, compared to FAP without additive. Other additives like calcium at 20 mM and 10–15% ammonium sulphate showed lower stability improvement than trehalose and sorbitol. NaCl, MgCl2, K2HPO4, and glycine were found to be poor stabilizers and showed only a marginal improvement. PEG 6000 did not show any increase in stability but was found to be slightly inhibitory.

Investigation of the Stark Shift of the Benzene-d1 101 — 000 Rotational Transition by Microwave Fourier Transform Spectroscopy

1987 ◽  
Vol 42 (1) ◽  
pp. 72-78 ◽  
Author(s):  
Eckhard Fliege ◽  
Helmut Dreizler
Keyword(s):  
Fourier Transform ◽  
Dipole Moment ◽  
Absorption Coefficient ◽  
Rotational Transition ◽  
Stark Shift ◽  
Permanent Dipole Moment ◽  
Fourier Transform Spectrometer ◽  
Deuterium Substitution ◽  
Set Up ◽  
Sample Pressure

The Stark shift of the J'K′_K′+ - J″K_K″+ = 101 - 000 transition of benzene-d1 was investigated to determine the dipole moment caused by deuterium substitution. A modified set-up of the microwave Fourier transform spectrometer was used to be able to apply the necessary Stark voltage and to increase the sensitivity of the instrument. The resulting permanent dipole moment is μa = 0.00810(28) D corresponding to an absorption coefficient of ymax = 2.8 • 10-12 cm-1 , determined at a sample pressure of 1.5 mTorr, for that line.

Sign in / Sign up

Export Citation Format

Share Document