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Keshav C. Patel - One of the best experts on this subject based on the ideXlab platform.

  • Monoazo Styryl Quinazolinone Reactive Dyes: Their Synthesis, Application and Density Function Theory (DFT) Calculation
    Proceedings of the National Academy of Sciences India Section A: Physical Sciences, 2017
    Co-Authors: Divyesh R. Patel, Paresh S. Patel, Keshav C. Patel, Jignesh T. Bilimoriya, Bhavesh M. Patel, Kalpesh M. Mehta, Shreyas A. Patel, Bhavesh S. Patel, Suban K. Sahoo
    Abstract:

    This paper is concerned with the synthesis and evaluation of some monoazo styryl quinazolinone based reactive dyes (9a – e) . The dyeing performance of all the synthesized dyes on different fibres has been assessed. The spectral properties (IR, ^1H-NMR and UV–visible spectra) of obtained dyes are reported. The dyed fibres showed fair to very Good Light Fastness and Good to excellent washing and rubbing Fastness properties on silk, wool and cotton fibres. Density functional theory (DFT) was employed for theoretical calculations.

  • Synthesis, Characterization and Applications of Some New Reactive Dyes Based on 5,5'-Methylenebis (2-Aminobenzenesulfonic Acid)
    international journal of chemical sciences, 2017
    Co-Authors: Elit A Gamit, Sejal M Patel, Suchitra S Savant, Hushen U Hajiyani, Vinay K Patel, Paresh S. Patel, Keshav C. Patel
    Abstract:

    Coupling of 2-chloro anilino cyanurated acids with 5,5'-methylenebis(2-sulfobenzenediazonium) chloride to give the corresponding methylene based reactive dyes in Good yields. They were characterized by nitrogen elemental analysis, IR and 1H NMR spectra. The dyeing performance of synthesized dyes has been examined on silk, wool and cotton. The synthesized dyes gave moderate to Good Light Fastness, Good to excellent wash Fastness and rubbing Fastness.

  • Colorimetric studies of some newly synthesized bisazo reactive dyes
    Arabian Journal of Chemistry, 2016
    Co-Authors: Divyesh R. Patel, Amit L. Patel, Keshav C. Patel
    Abstract:

    Abstract A series of cold brand bisazo reactive dyes (4a–h) were obtained by the coupling of tetrazotised 4,4′-methylene-bis(2-methyl-5-nitro aniline) (2) with various cyanurated coupling components (3a–h) in Good yield. Their dyeing performances as reactive dyes have been assessed on silk, wool and cotton fabrics. These dyes were characterized by UV–Vis, FTIR, 1H NMR spectroscopic techniques elemental analysis. The percentage dye bath exhaustion and fixation on different fibers were found to be very Good. The dyed fabric showed moderate to very Good Light Fastness and Good to excellent washing and rubbing Fastness properties. Spectral properties and colorimetric data (L∗, a∗, b∗, C∗, H∗, K/S) have also been studied in detail.

  • Synthesis and dyeing properties of some new monoazo disperse dyes derived from 2-amino-4-(2′,4′-dichlorophenyl)-1,3 thiazole
    Journal of Saudi Chemical Society, 2014
    Co-Authors: Divyesh R. Patel, Bhavesh M. Patel, N. B. Patel, Keshav C. Patel
    Abstract:

    3 Thiazole; Monoazo disperse dyes; Polyester fiber; Fastness properties Abstract Ten new monoazo disperse dyes (4a-j) have been synthesized by coupling of diazotized 2-amino-4-(2 0 ,4 0 -dichlorophenyl)-1,3 thiazole (2) with various N-alkyl derivatives of substituted ani- line (3a-j) and their dyeing performance on polyester fiber has been assessed. These dyes are char- acterized by elemental analysis, UV-vis spectra, IR and NMR spectroscopy. The absorption maxima (kmax) were recorded in DMF and were found to be in the range of 530-600 nm. The dyed polyester fabric showed fair to very Good Light Fastness and very Good to excellent washing and rub- bing Fastness properties with superior depth and levelness. a 2011 Production and hosting by Elsevier B.V. on behalf of King Saud University.

  • Synthesis, Antimicrobial Activity and Colorimetric Studies of Some New Bromo-quinazolinone Derivative as Potential Reactive Dyes
    Arabian Journal for Science and Engineering, 2012
    Co-Authors: Divyesh R. Patel, Keshav C. Patel
    Abstract:

    The objective of the current study was to introduce the quinazolinone molecule into a conventional reactive dye system. On this basis ten novel quinazolinone-based monochloro- s -triazine reactive dyes ( 7a – j ) were rapidly and efficiently synthesized by coupling route of diazotized 3-{4′-[4′′-amino-2′′,5′′-dichlorobenzyl]-2′, 5′-dichlorophenyl}-6-bromo-2-phenylquinazolin-4(3 H )-one ( 3 ) with a variety of m -nitro anilino cyanurated coupling components ( 6a – j ). Their characterization was done using elemental analysis, UV–Vis, IR, ^1H NMR and ^13C NMR spectroscopy. The solvatochromism was evaluated with respect to spectroscopic properties in organic solvents, viz., DMSO, DMF, methanol, acetic acid and chloroform. A detailed study of pharmacological screening (in vitro), solvatochromic effect, Fastness properties, colorimetric data ( L *, a *, b *, c *, H *, K / S ) and thermogravimetric analysis was also investigated. These dyes showed generally moderate to very Good Light Fastness and Good to excellent washing and rubbing Fastness properties and also showed Good antimicrobial activity.

Divyesh R. Patel - One of the best experts on this subject based on the ideXlab platform.

  • Monoazo Styryl Quinazolinone Reactive Dyes: Their Synthesis, Application and Density Function Theory (DFT) Calculation
    Proceedings of the National Academy of Sciences India Section A: Physical Sciences, 2017
    Co-Authors: Divyesh R. Patel, Paresh S. Patel, Keshav C. Patel, Jignesh T. Bilimoriya, Bhavesh M. Patel, Kalpesh M. Mehta, Shreyas A. Patel, Bhavesh S. Patel, Suban K. Sahoo
    Abstract:

    This paper is concerned with the synthesis and evaluation of some monoazo styryl quinazolinone based reactive dyes (9a – e) . The dyeing performance of all the synthesized dyes on different fibres has been assessed. The spectral properties (IR, ^1H-NMR and UV–visible spectra) of obtained dyes are reported. The dyed fibres showed fair to very Good Light Fastness and Good to excellent washing and rubbing Fastness properties on silk, wool and cotton fibres. Density functional theory (DFT) was employed for theoretical calculations.

  • Colorimetric studies of some newly synthesized bisazo reactive dyes
    Arabian Journal of Chemistry, 2016
    Co-Authors: Divyesh R. Patel, Amit L. Patel, Keshav C. Patel
    Abstract:

    Abstract A series of cold brand bisazo reactive dyes (4a–h) were obtained by the coupling of tetrazotised 4,4′-methylene-bis(2-methyl-5-nitro aniline) (2) with various cyanurated coupling components (3a–h) in Good yield. Their dyeing performances as reactive dyes have been assessed on silk, wool and cotton fabrics. These dyes were characterized by UV–Vis, FTIR, 1H NMR spectroscopic techniques elemental analysis. The percentage dye bath exhaustion and fixation on different fibers were found to be very Good. The dyed fabric showed moderate to very Good Light Fastness and Good to excellent washing and rubbing Fastness properties. Spectral properties and colorimetric data (L∗, a∗, b∗, C∗, H∗, K/S) have also been studied in detail.

  • Synthesis and dyeing properties of some new monoazo disperse dyes derived from 2-amino-4-(2′,4′-dichlorophenyl)-1,3 thiazole
    Journal of Saudi Chemical Society, 2014
    Co-Authors: Divyesh R. Patel, Bhavesh M. Patel, N. B. Patel, Keshav C. Patel
    Abstract:

    3 Thiazole; Monoazo disperse dyes; Polyester fiber; Fastness properties Abstract Ten new monoazo disperse dyes (4a-j) have been synthesized by coupling of diazotized 2-amino-4-(2 0 ,4 0 -dichlorophenyl)-1,3 thiazole (2) with various N-alkyl derivatives of substituted ani- line (3a-j) and their dyeing performance on polyester fiber has been assessed. These dyes are char- acterized by elemental analysis, UV-vis spectra, IR and NMR spectroscopy. The absorption maxima (kmax) were recorded in DMF and were found to be in the range of 530-600 nm. The dyed polyester fabric showed fair to very Good Light Fastness and very Good to excellent washing and rub- bing Fastness properties with superior depth and levelness. a 2011 Production and hosting by Elsevier B.V. on behalf of King Saud University.

  • Synthesis, Antimicrobial Activity and Colorimetric Studies of Some New Bromo-quinazolinone Derivative as Potential Reactive Dyes
    Arabian Journal for Science and Engineering, 2012
    Co-Authors: Divyesh R. Patel, Keshav C. Patel
    Abstract:

    The objective of the current study was to introduce the quinazolinone molecule into a conventional reactive dye system. On this basis ten novel quinazolinone-based monochloro- s -triazine reactive dyes ( 7a – j ) were rapidly and efficiently synthesized by coupling route of diazotized 3-{4′-[4′′-amino-2′′,5′′-dichlorobenzyl]-2′, 5′-dichlorophenyl}-6-bromo-2-phenylquinazolin-4(3 H )-one ( 3 ) with a variety of m -nitro anilino cyanurated coupling components ( 6a – j ). Their characterization was done using elemental analysis, UV–Vis, IR, ^1H NMR and ^13C NMR spectroscopy. The solvatochromism was evaluated with respect to spectroscopic properties in organic solvents, viz., DMSO, DMF, methanol, acetic acid and chloroform. A detailed study of pharmacological screening (in vitro), solvatochromic effect, Fastness properties, colorimetric data ( L *, a *, b *, c *, H *, K / S ) and thermogravimetric analysis was also investigated. These dyes showed generally moderate to very Good Light Fastness and Good to excellent washing and rubbing Fastness properties and also showed Good antimicrobial activity.

  • synthesis and characterization of reactive dyes based on 2 phenyl 3 4 4 aminophenylsulphonamido phenyl 4 3h quinazolinone 6 sulphonic acid
    Arabian Journal of Chemistry, 2011
    Co-Authors: Divyesh R. Patel, Keshav C. Patel
    Abstract:

    Abstract A series of new quinazolinone based mono azo reactive dyes (D 1–10 ) have been prepared by subsequent diazotization of 2-phenyl-3-[4′-(4″-aminophenylsulphonamido)]phenyl-4(3 H )-quinazolinone-6-sulphonic acid (C) and coupling with various 4-chloro anilino cyanurated coupling components. These dyes give purple, red, orange and yellow color shades. All the reactive dyes were characterized by their percentage yield, UV–Vis spectroscopy, elemental analysis, IR spectroscopy, 1 H NMR spectroscopy and dyeing performance on silk, wool and cotton fibres. The percentage dye bath exhaustion on different fibres has been found to be reasonably Good and acceptable. The dyed fibres show moderate to very Good Light Fastness and Good to excellent washing and rubbing Fastness.

H R Maradiya - One of the best experts on this subject based on the ideXlab platform.

  • Disperse dyes based on 2-aminothiazole derivatives for cellulose triacetate fabric
    Journal of Saudi Chemical Society, 2012
    Co-Authors: H R Maradiya
    Abstract:

    Abstract A range of azo disperse dyes was prepared by coupling diazotized 2-amino-4-( p -nitrophenyl)-5-nitrothiazole with various substituted arylamines. Spectral properties in the infrared and visible range of the dyes obtained were investigated. All the dyes, when applied on cellulose triacetate fabric as 2% shade, showed fairly Good to very Good Light Fastness and very Good to excellent Fastness to washing, perspiration, rubbing and sublimation. All the dyes gave a wide range of reddish brown to indigo shades with very Good depth and levelness on fabric. The purity of dyes was checked by thin layer chromatography. The percentage dyebath exhaustion and fixation on fabric was reasonably Good and acceptable.

  • Synthesis and dyeing performance of some novel thiazole azo disperse dyes
    Journal of Saudi Chemical Society, 2010
    Co-Authors: H R Maradiya
    Abstract:

    The synthesis of some novel monoazo disperse dyes derived from 5-acetyl-2-amino-4-methylthiazole using various N-alkyl derivatives of aniline and their dyeing performance as disperse dyes have been assessed on cellulose triacetate fabric. The spectral properties of these dyes were also measured. The dyed fabric show Good Light Fastness, very Good rubbing, perspiration, washing Fastness and excellent sublimation Fastness. These dyes have been found to give bright yellow to maroon color shade with very Good depth and levelness on fabric. The dyebath exhaustion and fixation on fabric has been found to be very Good. © 2009.

  • Synthesis and Application of Disperse Dyes Based on 2-Aminothiazole Derivatives
    Chemistry of Heterocyclic Compounds, 2003
    Co-Authors: H R Maradiya, V.s. Patel
    Abstract:

    A series of novel monoazo disperse dyes based on 2-amino-5-nitro-4-(p-nitrophenyl)thiazole were prepared using various N,N-dialkylaniline derivatives as the coupling components. The spectral properties in the IR and visible range of the dyes were investigated. The dyeing performance of these dyes was assessed on nylon fabric. These dyes were found to give a wide range of color shades from reddish brown to indigo with excellent brightness, levelness, and depth on nylon fabric. The dyed fabric showed fairly Good Light Fastness, Good to excellent Fastness to wash and perspiration, and excellent Fastness to sublimation. The dyebath exhaustion and fixation of the dyes on nylon were found to be very Good and acceptable.

  • Dyeing performance of disperse dyes based on 2-aminothiazole for cellulose triacetate and nylon fibers
    Fibers and Polymers, 2002
    Co-Authors: H R Maradiya, V.s. Patel
    Abstract:

    A series of monoazo disperse dyes based on 2-amino-4-phenylthiazole was prepared using various N,N-dialkylaniline derivatives as the coupling component. The dyes were characterized by IR spectral studies, visible absorption spectroscopy and elemental analysis. The dyeing performance of these dyes was assessed on cellulose triacetate and nylon fibers. These dyes were found to give a wide range of colour shades varying from bright red to royal blue with very Good depth, brightness and levelness on fibers. The dyed fibers showed Good to very Good Light Fastness and very Good to excellent Fastness to washing, perspiration, rubbing and sublimation. The dyebath exhaustion and fixation on the fibers were found to be very Good.

  • Monoazo disperse dyes based on 2-amino-1,3,4-thiadiazole derivatives
    Journal of the Serbian Chemical Society, 2002
    Co-Authors: H R Maradiya
    Abstract:

    A series of monoazo disperse dyes based on 2-amino-5-mercapto-1,3,4-thiadia- zole was prepared by coupling with various N-arylmaleimides. The dyeing performance of these dyes was assessed on nylon fabric. The dyes were found to give yellow to brown col- our shades on dyeing with Good depth and levelness on nylon fabric. The dyebath exhaus- tion, fixation and Fastness properties of the dyes were also determined. The dyed fabric showed moderate to Good Light Fastness and very Good to excellent Fastness to washing, rub- bing, perspiration and sublimation. The IR and visible range spectral properties of the dyes were also determined.

Saadia A. Abd El Megiede - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis and application of disazo reactive dyes derived from sulfatoethylsulfone pyrazolo[1,5-a]pyrimidine derivatives
    Journal of Saudi Chemical Society, 2014
    Co-Authors: Y A Youssef, Magda M. Kamel, M.s. Taher, N.f. Ali, Saadia A. Abd El Megiede
    Abstract:

    Abstract Two models of heterocyclic reactive dyes based on disazo pyrazoloprymidine derivatives and possessing a sulfatoethylsulfone reactive group were synthesized and characterized by elemental analysis, IR and 1H NMR spectroscopy. The dyes were applied to cotton, wool and silk fabrics. Effects of varying dyeing conditions were investigated. The results assessed for the exhaust dyeing methods on the different fabrics indicate that these reactive dyes showed high exhaustion and fixation values. The dyed fabrics also showed very Good Light Fastness and Good to excellent washing, rubbing and perspiration Fastness.

Nagaiyan Sekar - One of the best experts on this subject based on the ideXlab platform.

  • Condensation pigments for pigment printing of cotton - synthesis, photophysical properties, TD-DFT studies
    Fibers and Polymers, 2015
    Co-Authors: Amol S. Choudhary, Sharad Patil, Nagaiyan Sekar
    Abstract:

    Three novel mono azo condensation pigments were prepared by reacting two moles each of 1- aminoanthraquinone, 2-aminoanthraquinone, and 1-amino-5-benzimidoanthraquinone with the acid chloride of monoazo dye obtained by diazotizing 5-aminoisopthalic acid and coupling on to 2-napthol. The structures of the dyes were confirmed using FT-IR, UV-Visible, elemental, and thermogravimetric analysis techniques. The geometries of the azo and hydrazone tautomeric forms of the pigments were optimized and their electronic excitation properties were evaluated using density functional theory. The computed absorption spectral data of the azo pigments were in Good agreement with the experiment, thus allowing an assignment of the UV-Vis spectra. The pigments displayed a broad absorption maximum in the visible region between 460 and 523 nm. The synthesized pigments were applied on cotton for printing application and they showed very Good Light Fastness and washing Fastness properties.

  • A combined experimental and TD-DFT investigation of three disperse azo dyes having the nitroterephthalate skeleton
    Dyes and Pigments, 2014
    Co-Authors: Mininath S. Deshmukh, Nagaiyan Sekar
    Abstract:

    Abstract Three disperse azo dyes were synthesized using diazotized dimethyl 2-amino-5-nitroterephthalate (5) followed by the diazo coupling with different N-substituted aromatic amines. The structures of the dyes were confirmed using FT-IR, 1H NMR, 13C NMR, MS and HRMS spectral analysis. The geometries of the azo and hydrazone tautomeric forms of the dyes were optimized at B3LYP/6-31G(d) level of theory, and their electronic excitation properties were evaluated using density functional theory. The computed absorption spectral data of the azo derivatives are in Good agreement with the experiment, thus allowing an assignment of the UV–vis spectra. The dyes displayed a broad absorption maximum in the visible region between 498 and 561 nm. The synthesized azo disperse dyes were applied on polyester and nylon fiber and they show very Good Light Fastness and washing Fastness properties.