3,5-di-(4-nitrophenylamino diazo) benzoic acid and preparation method thereof

Abstract

The present invention relates to a bis-triazene, in particular to a 3.5-bis-(4-nitrobenzenediazoamino) benzoic acid and the preparation method thereof. The molecular structure is shown by the formula below, the preparation method includes the following procedures that: 1,3-diamino-benzoic acid is dissolved with HCl solution, NaNO2 is taken, dissolved with water, and added into the solution as above for reaction for about 1-2h to obtain a diazo solution, then p-nitroaniline is dissolved with ethanol, the solution is dripped into the former diazo solution for reaction for 1.5h to obtain a hennadeposit, which is allowed standing overnight, filtrated to obtain a deposit, which is rinsed with anhydrous ethanol and water, and then dried to obtain the brown solid. The substance provided by the present invention can be adopted as the fluorescence agent for heavy metal ion and the luminosity analytical developer.

Description

3,5-bis-(4-nitroanilinodiazo)benzoic acid and preparation method thereof technical field The invention relates to a bistriazene compound, specifically 3,5-bis-(4-nitroanilinodiazo)benzoic acid and a preparation method thereof Background technique Triazene contains-N=N-NH-functional group, after deprotonation, it is easy to cooperate with transition metal ion, and is a good coordination group (J.Barker, N.D.Cameron, M.Kilner, et al, J.Chem . Soc. DationTrans, 12(1991) 3435.). Triazene reagent is an excellent color developer for silver, mercury, cadmium, nickel and other metal ions. Because of its high sensitivity and easy synthesis, it is constantly attracting people's attention, but its coexisting ions interfere greatly, and its selectivity and The sensitivity still needs to be improved, and it is often only used as a chromogenic agent for photometric analysis, and is rarely used as a fluorescent reagent for the fluorescence detection of metal ions. Bistriazene reagents ...

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Problems solved by technology

The present invention provides 3,5-bis-(4-nitrophenylaminodiazo)benzene in order to solve the problem that the current bistriazene structure reagents in the prior art have low sensitivity in detecting metal ion concentration. Formic acid and its preparation method

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