2,6-bis-(1,1'-naphthalene amino azo)benzo(1,2-d;4,5-d') dithiazole, and preparation method and application thereof

Abstract

The invention relates to a ditriazene compound, in particular to a method for preparing 2,6-bis-(1,1'-naphthalene amino azo)benzo(1,2-d;4,5-d') dithiazole and application of the 2,6-bis-(1,1'-naphthalene amino azo)benzo(1,2-d;4,5-d') dithiazole. According to the 2,6-bis-(1,1'-naphthalene amino azo)benzo(1,2-d;4,5-d') dithiazole, a molecular structural formula is shown in the specification. The method is characterized in that naphthylamine with a fluorescent characteristic and a 2,6-diamino benzo[1,2-d;4,5-d'] dithiazole heterocyclic ring with an auxochromic capacity are bonded by a triazene structure to synthesize a linear ditriazene reagent with a relative large conjugation degree. The sensitivity and fluorescent characteristic of the reagent are enhanced, and the reagent can be used for the fluorometric analysis of lead ions in an alkaline medium.

Description

[0001] technical field

[0002] The present invention relates to a bistriazene compound, specifically a 2,6-bis-(1,1′-naphthylaminoazo)benzo(1,2-d;4,5-d′)bis Preparation method of thiazole and its application. Background technique

[0003] Triazene chromogen refers to the general term for all reagents containing R-N=N-NH-R' structure. This type of reagent contains -N=N-NH-functional group. Due to P-π conjugation, -NH- has a relatively Strongly acidic, under alkaline conditions, it is easy to coordinate with transition metal ions after deprotonation, and is a good coordination group (J. Barker, N. D. Cameron, M. Kilner, et al., J. Chem. Soc . Dalton Trans[J], 1991( 12): 3435-3445). Currently, triazene reagents are mainly used for Cd 2+ 、Ni 2+ , Hg 2+ 、Cu 2+ 、Co 2+ 、Ag + Photometric determination of metal ions such as Teng Enjiang, Jiang Wanquan, Zhu Yurui, etc., Chemical Reagents, 1992, 14(2): 109), and for Pb 2+ There are only a few reports on the photometric determ...

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