Calorimetric investigations of association in ternary systems. Part 1.—Enthalpy of complex formation of benzoic acid with proton acceptors

1981 ◽  
Vol 77 (5) ◽  
pp. 969 ◽  
Author(s):  
Stefania Taniewska-Osińska ◽  
Paweł Góralski
Keyword(s):  
Complex Formation ◽  
Benzoic Acid ◽  
Ternary Systems ◽  
Enthalpy Of Complex Formation ◽  
Calorimetric Investigations

scholarly journals Oxidative Study of Benzaldehyde by Isoqauinolinium Bromo Chromate

2019 ◽  
Vol 16 ◽  
pp. 5354-5359
Author(s):  
Arun Kumar Dwivedi ◽  
K. N. Sharma ◽  
Arvind Prasad Dwivedi
Keyword(s):  
Dielectric Constant ◽  
Acetic Acid ◽  
Complex Formation ◽  
Benzoic Acid ◽  
Neutral Salt ◽  
Kinetics Analysis ◽  
Keto Form ◽  
Acetic Acid Medium ◽  
Oxidative Reaction ◽  
Rate Of Reaction

The kinetics analysis of the oxidative reaction between benzaldehyde and oxidant is quinolinium Bromo chromate was reported in aqueous 40% acetic acid medium at 313 K. The rate of reaction varies first-power of [IQBC] and [H2SO4], whereas fractional-order kinetics was observed for benzaldehyde. The rate constant gradually increases with decrease in dielectric constant of the medium. The neutral salt does not alter the rate. The metal cations (Cu++) slightly accelerate the rate of oxidation when added to reaction mixture. The study rules out the participation of keto form of substrate in complex formation. Benzoic acid was identified as the end-product in stoichiometrically 1:1 based mechanism. The rate law was derived in accordance with the kinetic results.

Study on the Supramolecular Interaction of Dibenzoyl Peroxide(BPO) and ß-Cyclodextrin(ß-CD) by Spectrophtometry and its Analytical Application

2012 ◽  
Vol 554-556 ◽  
pp. 27-30
Author(s):  
Hui Xie ◽  
Yan Min Wang
Keyword(s):  
Aqueous Solution ◽  
Complex Formation ◽  
Benzoic Acid ◽  
Supramolecular Interaction ◽  
Guest Complex ◽  
Host Guest Complex ◽  
Molecule Recognition ◽  
Excellent Selectivity ◽  
Principal Advantage ◽  
Dibenzoyl Peroxide

The supramolecular interaction of BPO and ß-CD has been studied by spectrophtometry. The mechanism of the inclusion was studied. The results showed that ß-CD react with BPO to form a 2:1 or 1:1 host-guest complex.The ß-CD reacts with benzoic acid to form a 1:1 host-guest complex after the BPO was reduced by hydroxyl ammonium chloride.Based on the enhancement of the absorbance of BPO produced through complex formation, a spectrophotometric method for determination BPO in bulk aqueous solution in the presence of ß-CD was developed. A linear relationship between the absorbance and BPO concentration was obtained in the range of 0.2～50 μg.ml-1. The proposed method was used to determine the BPO in the flour with satisfactory results. The principal advantage of the proposed method is its excellent selectivity based on molecule recognition of ß-CD and simple.

Effect of Platinum(II) Complexes of 4-Methoxy-and 4-Chlorobenzoic Acid Hydrazides on Saccharomyces cerevisiae

1997 ◽  
Vol 52 (1-2) ◽  
pp. 45-48 ◽  
Author(s):  
Svoboda Tabakova ◽  
Nicolay Dodoff
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Complex Formation ◽  
Benzoic Acid ◽  
Mechanism Of Action ◽  
Acid Hydrazide ◽  
Complex Activity ◽  
Chlorobenzoic Acid ◽  
The Stability ◽  
Benzoic Acid Hydrazide ◽  
Methoxybenzoic Acid

This study reports the anti-yeast effect of the 4-methoxybenzoic acid hydrazide (pmbah), 4-chlorobenzoic acid hydrazide (pcbah) and their Pt(II) complexes: cis- [PtL2X2] and cis- [PtL(NH3)Cl2] where L is either pcbah or pmbah and X is Cl, Br or I. MICs of the 4- substituted analogues (20 000-625 μм) are much lower than those of the previously reported benzoic acid hydrazide and 3-methoxybenzoic acid hydrazide. Complex formation results in significant increase of potency which may be due to a change in the mechanism of action, but the MIC (>400-50 μм) and the IC50 (>400-1 μм) values show that higher activity of the ligands in the free state does not result in enhanced complex activity. Differences in the potency of iodo-, chloro- and bromo complexes suggest MIC and IC50 values may be in correlation with the stability of the complex, rather than with the activity of the free ligands. Osmotically unstable mutants were more susceptible to the compounds than their parent strains, but differences among the parent strains were greater.

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