Sulphonic group

Related to Sulphonic group: sulfonic acid
(Chem.) the hypothetical radical, SO2.OH, the characteristic residue of sulphonic acids.

See also: Sulphonic

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Such ions may interact with the sulphonic group of the dye and/or coordinate N atoms of the azo bond, in agreement with the literature [68, 69].
Being p[K.sub.a] of SA equal to 3.23, the moiety in solution should be protonated at the beginning of the reaction and deprotonated at pH = 4.58, so that after 60 min reaction it should adsorb at the surface of Fe_fresh through the sulphonic group, from which the observed decrease in intensity of the band at ca.
Equation (5) describes a competitive reaction between sulphate anion and a sulphonic group in the dye molecule for the binding sites on the oxide surface during desorption.
Sulphonic group attached at the position 5(5?) is oriented in away that oxygen atoms are oriented out of plane andtherefore have less impact on dipole moment as expected.
Amino acid analysis was conducted on the Shimadzu Amino Acid Analyzer with Shim-Pack Amino- Na column (4.6mm I.D x100mm) containing strong acidic cation exchanger resin (styrene divinyl benzene copolymer with sulphonic groups).
It has been reported that polymerization of sub-stituted pyrrole with long-chain alkyl and sulphonic groups leads to formation of polypyrrole derivatives soluble in some common organic solvents [5].
The high number of sulphonic groups in the RR120 structure resulted in shorter discoloration time.
The FT-IR and FT-Raman spectra show the presence of amine and sulphonic groups. The theoretical factor group analysis predicts 192 vibrational optical modes, which decompose into [[GAMMA]] = 18 ([A.sub.g] + [B.sub.1g] + [B.sub.2g] + [B.sub.3g] + [A.sub.u] + [B.sub.1u] + [B.sub.2u] + [B.sub.3u]) modes with 45 external modes and three acoustical modes [[GAMMA].sub.acou] = [1.sub.Ag] + 2[A.sub.u].
The FT-IR spectra were collected over the range of wavenumbers from 400 to 4000 [cm.sup.-1], but for the analysis of sulphonic groups and the siloxane modifications, the range from 800 to 1400 [cm.sup.-1] has to be considered.
MDI resin has a high chemical affinity and reactivity with hydrogen-containing groups, such as the hydroxyl and sulphonic groups, which gives it the ability to bond different materials.
The other layer consists of perfluorinated polymer with substituted sulphonic groups and is adjacent to the anodic side..