Synthesis and evaluation of changes induced by solvent and substituent in electronic absorption spectra of some azo disperse dyes

Mohammadi, Asadollah; Yazdanbakhsh, Mohammad; Farahnak, Lahya

doi:10.1016/j.saa.2011.12.062

Cited by 51 publications

(21 citation statements)

References 25 publications

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“…The S-C (S1-C7) bond length is 1.741 (2), indicative of a single bond character. The N4-N3-C8 and N3-N4-C7 bond angles are 116.12 (18) and 110.69 (17) respectively. The N4-C7-C1, N4-C7-S1, N3-C8-C13, and N3-C8-C9 bond angles are 125.6 (2), 126.09 (16), 124.50 (19), and 116.70 (19) respectively.…”

Section: Structure Of D2mentioning

confidence: 99%

Crystallographic study of two monoazo disperse dyes with a D–π–A system

Zhang

Hou

2015

Coloration Technology

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Two azo disperse dyes, 2,6‐dichoro‐4‐nitro‐4′,4′‐N‐cyanoethyl‐N‐benzyl‐azobenzene (D1) and 3‐(3‐methyl‐4‐N‐ethyl‐N‐benzyl‐phenyldiazenyl)‐5‐nitro‐2,1‐benzisothiazole (D2), were synthesised and characterised. The crystal morphologies and single crystal structures were measured. The various packing and supramolecular interactions were described. D1 formed stellate crystals. The two benzene rings bilateral to the azo unit were not coplanar. Their dihedral angle was 75.72°. They were linked by the azo unit and were twisted. The coupling‐component N‐substituted benzyl and benzene rings were not coplanar. The chemical structure was not the typical azo structure. A dimeric packing mode was formed between adjacent molecules in a head‐to‐head and tail‐to‐tail manner. One molecule was inserted between two dimeric molecules in a head‐to‐tail manner. D2 formed globe crystals. The isothiazole and benzene rings of the azo unit were coplanar, with the typical π–π conjugated structure. The benzene rings of the azo unit and the coupling‐component N‐substituted benzyl were vertical. Their torsion angle was 179.9°.

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Section: Structure Of D2mentioning

confidence: 99%

Crystallographic study of two monoazo disperse dyes with a D–π–A system

Zhang

Hou

2015

Coloration Technology

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“…These titrations were repeated at temperatures 308 and 318 K. A constant temperature was maintained at ± 0.05 K by using an ultra-thermostat (Neslab 2 RTE 220). The pH-meter readings in 40% (v/v) EtOH-water mixture were corrected according to the Van Uitert and Hass relation [19].…”

Section: Potentiometric Studiesmentioning

confidence: 99%

Potentiometry and geometrical structure of some azodye compounds and their metal complexes

Soayed

El-Husseiny

2015

Journal of Molecular Liquids

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“…Furthermore, it is necessary that the range and number of novel antioxidant dyes would be increased for the textile industry. According to the above potent usefulness of the dyes containing piperazine fragment and in continuation of our studies on the synthesis of azo dyes [5,[36][37][38], we report herein the synthesis of some novel push-pull heterocyclic azo dyes in order to evaluate structure, solvatochromism, antioxidant activity and dyeing performance on polyester fibers (Scheme 1). Scheme 1.…”

Section: Introductionmentioning

confidence: 99%