Synthesis and absorption abilities of pyrazolo[5,1-c][1,2,4]triazine-based disperse dyes

A series of 13 novel pyrazolo[5,1-c][1,2,4]triazine-based disperse dyes was synthesized by heating ethyl pyrazolylhydrazonocyanoacetate in glacial acetic acid. Solvent and acid-base influences on the wavelength of maximum absorption have been studied. © 2013 Springer Science+Business Media New York

Synthetic Fiber Dyeing with New Pyrazole Disperse Dyes and Their Colorimetric and Fastness Properties

A series of disazo pyrazole disperse dyes were synthesized and reported at our previous work. These 8 synthesized disazo pyrazole disperse dyes (3a-3h) were applied to poly(lactic acid) (PLA), poly(ethylene terephthalate) (PET), and polyamide 6.6 fibers. Their colorimetric and color fastness properties were investigated. All studied fibers dyed with these synthesized dyes exhibited yellow-red shades. 3c (p-Cl), 3e (m-Cl), and 3h (o-Cl) disazo disperse dyes, having auxochrome -Cl, led to the lowest color yield values for all three studied fibers. The same dyes resulted in higher color strength with darker shades on the PET and PLA fabrics in comparison PA 6.6 fabrics. 3a (p-NO2), 3b (p-OCH3), 3d (m-NO2), 3f (o-NO2), and 3g (o-OCH3) disazo disperse dyes can be recommended for PLA and PET dyeing from the color point of view leading to medium to heavy depth of shades. The wash, alkaline and acidic perspiration, dry and wet rub, water and sea water fastness levels of PLA, PET, and PA 6.6 samples dyed with 3a-3h dyes were generally quite high and in the commercially acceptable range with few exceptions. Dyed PLA fabrics displayed better sublimation fastness levels than dyed PET and PA 6.6 fabrics. Synthesized disperse dyes resulted in high light fastness performance on especially PET and PLA fibers. Light fastness level was better for dyed PET samples by comparison with dyed PLA and PA 6.6 fabrics. © 2018, The Korean Fiber Society and Springer Science+Business Media B.V., part of Springer Nature.Firat University Scientific Research Projects Management Unit: 2012FBE035This study is sponsored and supported by Pamukkale University Scientific Research Project Coordination Unit PAUBAP by the project number of 2012FBE035

Investigation of ground state tautomeric form of a heterocyclic disazo dye derived from barbituric acid by ab initio Hartree-Fock and density functional theory calculations

The optimized molecular structures, vibrational frequencies and corresponding vibrational assignments of 10 tautomeric forms of a heterocyclic disazo dye [5-(3-methyl-4-phenylazo-1H-pyrazole-5-ylazo) barbituric acid] have been calculated using ab initio Hartree-Fock (HF) and density functional theory (B3LYP) methods with 6-31G(d, p) basis set level. Calculations have shown that the most probably preferential form of the heterocyclic disazo barbituric acid dye in the ground state is azo-hydrazo-keto form corresponding to the experimental results. © 2008 Elsevier B.V. All rights reserved

The Management of Traumatic Brain Injury in Children

Among all age groups, young children have one of the highest rates of Traumatic Brain Injury (TBI) related emergency department (ED) visits

The synthesis, characterization and investigation of absorption properties of disperse disazo dyes containing pyrazole and isoxazole

In this study, new heterocyclic disazo disperse dyes, substituted with methyl, nitro and chloro groups at their o-, m-, p- positions were synthesized (4a-4j). These newly synthesized ten disazo disperse dyes were characterized by elemental analysis and spectral techniques. Spectroscopic data for novel synthesized dyes, dissolved in six solvents, were procured. The influences of six different acidic and alkaline solutions were also reported. In addition, the absorption capability of these ten-novel heterocyclic disazo disperse dyes at their o-, m- and p- positions were explored in detail. © 2018 Elsevier B.V.109M578This study is sponsored and supported by The Scientific and Technological Research Council of Turkey (TUBITAK) with the TUBITAK project number of 109M578

behaviour of four new azocalix[4]arenes

Four new azocalix[4]arenes {5,11,17,23-tetrakis[(2-hydroxy-5-tert-butylphenylazo)]-25,26,27,28-tetrahydroxycalix[4]arene (1), 5,11,17,23-tetrakis[(2-hydroxy-5-nitro phenylazo)]-25,26,27,28-tetrahydroxycalix[4]arene (2), 5,11,17,23-tetrakis[(2-amino-5-carboxylphenylazo)]-25,26,27,28-tetrahydroxycalix[4]arene (3) and 5,11,17,23-tetrakis[(1-amino-2-hydroxy-4-sulfonicacidnapthylazo)]-25,26,27,28-tetrahydroxycalix[4]arene (4)} have been synthesized from p-tert-butylphenol, p-nitrophenol, p-aminobenzoic acid and 1-amino-2-hydroxy-4-sulphonic acid by diazo coupling reaction with p-aminocalix[4]arene. The resulting ligands (1-4) were treated with three transition metal salts (e.g., CuCl2 center dot 2H(2)O, NiCl2 center dot 6H(2)O or CoCl2 center dot 6H(2)O). Cu(II), Ni(II) and Co(II) complexes of the azocalix[4]arene derivatives were obtained and characterized by UV-vis, IR, H-1-NMR spectroscopic techniques and elemental analysis. All the complexes have a metal:ligand ratio of 2:1. The Cu(II) and Ni(II) complexes of azocalix[4]arenes are square-planar, while the Co(II) complexes of azocalix[4]arenes are octahedral with water molecules as axial ligands. The solvent extraction of various transition metal cations from the aqueous phase to the organic phase was carried out by using azocalix[4]arenes (1-4). It was found that, azocalix[4]arenes 1, 2 and 3 examined selectivity for transition metal cations such as Ag+, Hg+ and Hg2+. In addition, the thermal stability of metal:azocalix[4]arene complexes were also reported.C1 Pamukkale Univ, Fac Sci Arts, Dept Chem, TR-20017 Denizli, Turkey