Synthesis and spectroscopic studies of some naphthalimide based disperse azo dyestuffs for the dyeing of polyester fibres

Synthesis and Application of Some Alkali‐Clearable Azo Disperse Dyes Based on Naphthalimide Derivatives

“…In the UV range, there are only naphthalene bands, characteristic for simple naphthalene derivatives which are ascribed to the absorption of the benzeneazonaphthalene (BAN) chromophore and in the visible range bands characteristic for azo dyes. [14][15][16][17] The chromophore in the 340-375 nm range and in the visible range the K-band (p®p* shifts) appears in the region 500-589 nm, characteristic for azo dyes. 18 The present considerations are limited to a discussion of bands within 206-589 nm, where the known K and R bands (n®p* shifts) appear and show characteristic changes depending on the solvent used.…”

“…19 Introduction of the phenylazo chromophore into the 3-position of 1,8-naphthalimides results in a large bathochromic shift in the absorption maxima in chloroform (Table 1) compared with the usual yellow colour of 4-nitro-Nsubstituted-1,8-naphthalimides and the usual orange colour of 4-amino-N-substituted-1,8-naphthalimides. 15,16 The visible absorption maxima of several donor-substituted azobenzenes were considered 20 and it is clear that for a monosubstituted dye the bathochromic shift depends on the expected manner of the electron donating strength of the substituent. Since the electronic transition in these compounds involves a general migration of electron density from the donor group towards the azo group, it is not surprising that electron withdrawing groups in the diazonium component ring exert a bathochromic effect and electron donating groups in the coupling component ring exert a bathochromic effect.…”

Facile synthesis of 4-nitro-N-substituted-1,8-naphthalimide derivatives using ultrasound in aqueous media

“…A large number of organic reactions can be carried out under ultrasonic irradiation, resulting in high yields, short reaction times, and mild conditions (17)(18)(19)(20)(21). The imidation of naphthalimide derivatives is one of the most widely studied reactions and finds extensive application in the synthesis of a variety of fine chemicals (22)(23)(24)(25)(26)(27). Based on our knowledge there are no report on sonic synthesis of aromatic amine derivatives of 1,8-naphthalimide and study the effect of reaction time and percentage of reactants on reaction yield.…”

Synthesis, Characterization and Biological Activities of Some Metal Complexes Derived from Azo Dye Ligand 2-[2'-(5-Methyl thiazolyl)azo]-5-dimethylamino Benzoic Acid

“…The dyeing capability of dye depends on functional groups present in the dyes, such as azo, hydroxyl, carboxylic acids, esters and amines [4,5]. The thiazolylazo dyes and its derivatives are also used for colouring consumer goods, such as clothes, plastics, textiles, food, toys and cosmetics [6,7]. Thiazolylazo dyes were also used in chemical operations such as spectrophotometry, solid phase extraction, liquid chromatography, electrochemistry and cloud point [8][9][10].…”