Molecular susceptibility. The diamagnetic anisotropies of sixteen aromatic molecules at infinite dilution in carbon tetrachloride

1966 ◽  
Vol 19 (2) ◽  
pp. 179 ◽  
Author(s):  
RJW Le Fevre ◽  
DSN Murthy
Keyword(s):  
Carbon Tetrachloride ◽  
Infinite Dilution ◽  
Diamagnetic Susceptibility ◽  
Photometric Method ◽  
Aromatic Molecules ◽  
Visual Technique

A photometric method for the determination of Cotton-Mouton constants of liquids and solutions is introduced. It advantageously replaces the visual technique used previously. Anisotropies of diamagnetic susceptibility are recorded for 16 aromatic molecules, and preliminary estimates drawn therefrom of the apparent longitudinal and transverse susceptibilities of Car-X bonds, where X = halogen, methyl, etc.

Molecular susceptibility. The determination of molar Cotton-Mouton constants at infinite dilution in benzene or cyclohexane

1966 ◽  
Vol 19 (8) ◽  
pp. 1315 ◽  
Author(s):  
RJW Le Fevre ◽  
DSN Murthy
Keyword(s):  
Carbon Tetrachloride ◽  
Infinite Dilution ◽  
Empirical Equations

Reliable measurements of the small incremental Cotton-Mouton constants encountered at low solute concentrations with solutions in which the magnetic birefringences of solute and solvent do not differ widely cannot be made with equipment at present available. Five such systems are examined in this paper. It is shown that the larger incrementa easily observable among stronger solutions can be fitted to empirical equations containing ascending powers of the concentrations and hence estimates of ΔC/w2 as w2 approaches zero become accessible. Values of ∞(mC2) obtained by this device agree reasonably with others directly drawn from much weaker solutions of the same solutes in carbon tetrachloride or cyclohexane, i.e, in media for which C1 = 0.

Molecular susceptibility. The diamagnetic anisotropies of some polynuclear aromatic hydrocarbons

1969 ◽  
Vol 22 (7) ◽  
pp. 1415 ◽  
Author(s):  
JW Le Fevre ◽  
DSN Murthy
Keyword(s):  
Carbon Tetrachloride ◽  
Aromatic Hydrocarbons ◽  
Infinite Dilution ◽  
Diamagnetic Susceptibility ◽  
Polynuclear Aromatic Hydrocarbons

Molar Cotton-Mouton constants are reported for certain aromatic hydrocarbons as solutes at infinite dilution in benzene or carbon tetrachloride. Relative anisotropies (i.e. the ratio of the anisotropy in the diamagnetic susceptibility of the molecule concerned to that of benzene) are calculated for these and other molecules for which data have been recorded previously.1

Colorimetric Determination of Amoxicillin in Pure and some Pharmaceutical Formulations Via Reaction with Potassium Permanganate as Oxidant Reagent

2019 ◽  
Vol 10 (02) ◽  
Author(s):  
Abbas Shebeeb Al-kadumi ◽  
Sahar Rihan Fadhel ◽  
Mohammed Abdullah Ahmed ◽  
Luma Amer Musa
Keyword(s):  
Potassium Permanganate ◽  
Pharmaceutical Preparations ◽  
Pharmaceutical Formulations ◽  
Atomic Emission ◽  
Basic Medium ◽  
Photometric Method ◽  
Colorimetric Determination ◽  
Spectrophotometric Methods ◽  
Label Claim

We proposed two simple, rapid, and convenient spectrophotometric methods are described for the determination of Amoxicillin in bulk and its pharmaceutical preparations. They are based on the measurement of the flame atomic emission of potassium ion (in first method) and colorimetric determination of the green colored solution for manganite ion at 610 nm formed after reaction of Amoxicillin with potassium permanganate as oxidant agent (in the second method) in basic medium. The working conditions of the methods were investigated and optimized. Beer's law plot showed a good correlation in the concentration range of 5-45 μg/ml. The detection limits and relative standared deviations were (2.573, 2.814 μg/ml) (2.137, 2.498) for the flame emission photometric method and (1.844, 2.016 μg/ml) (1.645,1.932) for colorimetric methods for capsules and suspensions respectively. The methods were successfully applied to the determination of Amoxicillin in capsules and suspensions, and the obtained results were in good agreement with the label claim. No interference was observed from the commonly encountered additives and expectancies.

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