3686-66-6Relevant articles and documents
The effect of 4-halogenobenzoate ligands on luminescent and structural properties of lanthanide complexes: Experimental and theoretical approaches
Monteiro, Jorge H. S. K.,De Bettencourt-Dias, Ana,Mazali, Italo O.,Sigoli, Fernando A.
, p. 1883 - 1891 (2015/03/18)
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
Electronic and steric effects: How do they work in ionic liquids? the case of benzoic acid dissociation
D'Anna, Francesca,Marullo, Salvatore,Vitale, Paola,Noto, Renato
experimental part, p. 4828 - 4834 (2010/10/04)
(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.
Effect of solvents on the kinetics and mechanism of the acidic and alkaline hydrolysis of hydroxamic acids
Ghosh, Kallol K.,Krishnani, Kishore K.,Ghosh, Sharmistha
, p. 337 - 342 (2007/10/03)
The acid catalyzed hydrolysis of N-phenylbenzohydroxamic acid (PBHA) C6H5C(=0)N(OH)C6H5 has been studied in aq. dioxane, acetone, dimethylsulphoxide, dimethylformamide, methanol, ethanol and 2-propanol mixtures. Dioxane and methanol have a rate enhancing effect but DMF, acetone, ethanol and 2-propanol exert a rate decreasing effect. In DMSO an increase is followed by a decrease i.e. a rate maximum is observed. An attempt has also been made to study the alkaline hydrolysis of PBHA and two of its derivatives (X-C6H4C(=0)N(OH)C6H5; X=4-NO2, 4-Cl) in aq. dioxane. In all case the pseudo first order rate constant increase with increasing dioxane content. The activation parameters ΔH(+), Δ(+), and ΔGH(+) have been calculated. An attempt has been made to correlate rate data for acidic hydrolysis in terms of solvatochromic parameters and linear free energy relationships.
