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See phenolate.
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Keywords: Solid Aerosol, Bismuth salicylate, Potassium phenoxide, Sodium-GA-naphthylamine-4-sulfonate tetrahydrate and Cadmium salicylate hydrate as Major Pollutants, remote and local origin both, X-ray Diffraction, Particle size distribution, health co relationship (protective measures).
According to the computational data merocyanine isomers of (2b) are able to form complexes with cation [Zn.sup.2+] coordinated by oxygen atom of carboxyl group, phenoxide oxygen of benzopyran moiety, and by the carbon atom of the methine bridge (Figure 6).
Figure 3 displays, beside peaks with medium intensities, three dominant bands: a broad strong band at 3433 [cm.sup.-1], a band with three maxima at 1624, 1607 and 1598 [cm.sup.-1], and a broad band at 1446 [cm.sup.-1]; further, three regions of 1165-1024, 880-693 and 618512 [cm.sup.-1], and two expected stretch bands at 1335 and 1242 [cm.sup.-1] (phenoxide CO) were recorded.
The phenoxide ion sites in aqueous medium may act as binding sites for different soluble metal ions.
However an electron density peak 1.220 [Angstrom] away from the two phenoxide oxygen atoms related by the two-fold rotation axis reveals that a 1:1 complex of 3-nitrophenol : tetramethylammonium 3-nitrophenolate was actually synthesized.
A solution of phenol 10N is added to warm solution of NaOH 25N under strong agitation (in order to avoid formation of phenoxide crystals), then medium temperature is adjusted to 60-65 [degrees]C while 0.5 mole of dichloromethane is added directly into the solution in three parts each one after 15 min.
In unbuffered methanol, the added metal increases the rate of the first step (intramolecular displacement of phenoxide) by a factor of 78 billion, and the second step (transesterification) by 20 billion.
The cure reaction in the alkaline range is much favored by the phenoxide type structure which is present in both nonmodified and modified tannin molecules.
In alkaline solutions, phenols exist as the phenoxide ion.
The protective effect may be explained by the stabilization of the peroxyl radical by the phenolic compounds by the transfer of hydrogen atoms from the hydroxyl groups of the phenolic compounds or by electron transfer from the phenoxide anion.
The reaction enthalpy of the first step corresponds to the proton affinity (PA) of the phenoxide anion (ArO).
It should be noted that as various amounts of F are used the molar ratio of NaOH/P changes causing different catalytic activity of phenoxide ions.