SU794005A1 - 3-(4-bromophenyl)-10-hydroxy-1-carboxybenzo/f/quinooline sulfonic-8 acid possessing analytical luminescent reagent properties - Google Patents

Description

supposed to be due to its polarity (it is an internal salt). Additionally, it can be purified by recrystallization from a mixture of DMSO - isobutanol 1: 1. Elemental analysis:

Found,%: C 50.5; H 1.9; N 2.6.

CzoHiaBrNOeS.

Calculated,%: C, 51.25; H 2.56; N 2.99.

The possibility of using the proposed compound as a luminescent reagent for magnesium is investigated using the example of studying the luminescence of aqueous solutions of this compound at different pH values in the presence of various cations.

(K +, Na, Ca2b, Ba2Sr,, Mg2A13 +, Fe2 +, ReZg, Co, Ni,,,

Hg2, Zif +, Cu2 +, Ag +).

The following results are obtained:

1) intrinsic luminescence of a substance in an aqueous solution:

pH less than 2.5 Bright green; 2.5-6.5 Bright blue; 6.5-7.5 Dark blue of medium strength; Over 7.5 Virtually absent;

2) in the presence of the above cations in an acidic medium, the nature of the luminescence does not change;

3) in an alkaline medium in the presence of the above cations, with the exception of magnesium, there is no luminescence. In the presence of magnesium, pink luminescence of medium strength occurs;

4) there is a direct dependence of the luminescence force on the magnesium concentration. Bera's law is observed for magnesium concentrations up to 8 µg / ml. Above this concentration, the reagent forms an insoluble precipitate with magnesium;

5) all of the above cations do not interfere with the determination of magnesium, unless they form dense precipitates in an alkaline medium.

As an example of the quantitative determination of magnesium, the definition of magnesium in the bases was studied: all bases were dissolved in 0.1 g in 45 ml of 0.1 N. NaOH solution. Magni is administered in 5.0 ml 0.001 n. solution (obtained content of 2.4 µg / ml). The reagent was injected at 0.1 ml of 0.01% solution in 0.1 n. NaOH solution.

Luminesce- Found, qi,% μl / ml

35

2.6

34.5 2.4

34.0 2.2

35.0 2.6

35.5 2.9

The relative error is 5%.

Thus, 3- (4-bromophenyl) -10-hydroxy-carboxybenzo / quinoline sulfonic acid is a highly specific reagent for magnesium.

Claims (2)

1. Reagents for luminescence analysis. M., IREA, 1971, p. five. 2. Kozlov, N. S. 5,6-Benzoquinolines, Minsk, “Science and Technology, 1970.