- Synthesis, Characterization, and Antibacterial Activity of Cd(II) Complexes with 3-/4-Fluorobenzoates and 3-Hydroxypiridine as Co-Ligands
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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,
- Murat, Durman,Mustafa, Sertcelik
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p. 1351 - 1359
(2020/10/02)
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- The effect of 4-halogenobenzoate ligands on luminescent and structural properties of lanthanide complexes: Experimental and theoretical approaches
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The ligands 4-fluorobenzoate (4-fba), 4-chlorobenzoate (4-cba), 4-bromobenzoate (4-bba) and 4-iodobenzoate (4-iba) were chosen in order to synthesize europium(iii), gadolinium(iii) and terbium(iii) complexes and compare the effect of halogens on their phy
- Monteiro, Jorge H. S. K.,De Bettencourt-Dias, Ana,Mazali, Italo O.,Sigoli, Fernando A.
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p. 1883 - 1891
(2015/03/18)
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- 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
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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.
- Yusof, Nor Saadah M.,Khan, M. Niyaz
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scheme or table
p. 10627 - 10635
(2011/01/12)
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- Electronic and steric effects: How do they work in ionic liquids? the case of benzoic acid dissociation
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(Figure Presented) The need to have a measure of the strength of some substituted benzoic acids in ionic liquid solution led us to use the protonation equilibrium of sodium p-nitrophenolate as a probe reaction, which was studied by means of spectrophotometric titration at 298 K. In order to evaluate the importance of electronic effect of the substituents present on the aromatic ring, both electron-withdrawing and -donor substituents were taken into account. Furthermore, to have a measure of the importance of the steric effect of the substituents both para- and ortho-substituted benzoic acids were analyzed. The probe reaction was studied in two ionic liquids differing for the ability of the cation to give hydrogen bond and π-π interactions, namely [bm 2im][NTf2] and [bmpyrr][NTf2]. Data collected show that benzoic acids are less dissociated in ionic liquid than in water solution. Furthermore, the equilibrium constant values seem to be significantly affected by both the nature of ionic liquid cation and the structure of the acid. In particular, the ortho-steric effect seems to operate differently in water and in the aromatic ionic liquid, determining in this solvent medium a particular behavior for ortho-substituted benzoic acids.
- D'Anna, Francesca,Marullo, Salvatore,Vitale, Paola,Noto, Renato
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experimental part
p. 4828 - 4834
(2010/10/04)
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