499-90-1Relevant articles and documents
Synthesis, Characterization, and Antibacterial Activity of Cd(II) Complexes with 3-/4-Fluorobenzoates and 3-Hydroxypiridine as Co-Ligands
Murat, Durman,Mustafa, Sertcelik
, p. 1351 - 1359 (2020/10/02)
Abstract: In this study, two new complexes of Cd(II) 4-fluorobenzoate (4-FB)/3-fluorobenzoate (3-FB) with 3-hydroxypyridine (3-HPY) have been synthesized and structural characterizations have been performed by using elemental analysis, FT-IR spectroscopy,
Determination of an ion exchange constant by the use of a kinetic probe: A new semiempirical kinetic approach involving the effects of 3-F- and 4-F-substituted benzoates on the rate of piperidinolysis of anionic phenyl salicylate in aqueous cationic micelles
Yusof, Nor Saadah M.,Khan, M. Niyaz
scheme or table, p. 10627 - 10635 (2011/01/12)
Pseudo-first-order rate constants (kobs) for the nucleophilic substitution reaction of piperidine (Pip) with ionized phenyl salicylate (PS-), obtained at a constant [Pip]T (= 0.1 M), [PS -]T (= 2×10-4 M), [CTABr]T (cetyltrimethylammonium bromide), ≤0.06 M NaOH, and a varying concentration of MX (= 3-FC6H4CO2Na, 3-FBzNa and 4-FC 6H4CO2Na, 4-FBzNa), follow the kinetic relationship kobs = (k0 + θKX/S[MX])/(1 + KX/S[MX]) which is derived by the use of the pseudophase micellar (PM) model coupled with an empirical equation. The empirical equation explains the effects of [MX] on CTABr micellar binding constant (KS) of PS- that occur through X-/PS- ion exchange. Empirical constants θ and KX/S give the parameters F X/S and KX/S, respectively. The magnitude of F X/S gives the measure of the fraction of micellized PS- transferred to the aqueous phase by the limiting concentration of X- through X-/PS- ion exchange. The values of FX/S and KX/S have been used to determine the usual thermodynamic ion exchange constant (KXY) for ion exchange process X -/Y- on the CTABr micellar surface. The values of K XBr (where Br = Y) have been calculated for X = 3-FBzNa and 4-FBzNa. The mean values of KXBr are 12.8 ± 0.9 and 13.4 ± 0.6 for X- = 3-FBz- and 4-FBz -, respectively. Nearly 3-fold-larger values of KX Br for X = 3-FBz- and 4-FBz- than those for X = Bz-, 2-ClBz-, 2-CH3Bz-, and the 2,6-dichlorobenzoate ion (2,6-Cl2Bz-) are attributed to the presence of wormlike micelles in the presence of >50 mM 3-FBz- and 4-FBz- in the [CTABr]T range of 5-15 mM. Rheological properties such as shear thinning behavior of plots of shear viscosity versus the shear rate at a constant [3-FBz-] or [4-FBz-] as well as shear viscosity (at a constant shear rate) maxima as a function of the concentrations of 3-FBz- and 4-FBz- support the conclusion, derived from the values of KXBr, for the probable presence of wormlike/viscoelastic micellar solutions under the conditions of the present study.
