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Brightening Agent

The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform

Nagaiyan Sekar – 1st expert on this subject based on the ideXlab platform

  • synthesis of 2 methyl 5 5 phenyl substituted 1 3 4 oxadiazole 2 yl quinazolin 4 one fluorescent Brightening Agent computational and experimental comparison of photophysical structure
    Journal of Molecular Structure, 2019
    Co-Authors: Vikas S Patil, Vikas S Padalkar, Nagaiyan Sekar, Satish V Patil, Jamatsing D Rajput

    Abstract:

    Abstract Report is about the synthesized new range of oxadiazole substituted quinazoline and studied its electronic distribution to attribute fluorescent properties. B3LYP Density Functional Theory (DFT) computational optimization was studied to observe the effect of electron donor and acceptor substituent’s on photophysical properties, electronic state and energy level. DFT computational optimization was performed by Polarizable Continuum Model (PCM) of solvation strictly in the gas phase and DMF maintaining C1 symmetry in ground state geometry structure. UV–vis and fluorescence spectroscopic methods help in understanding the relationship between the electron donor and acceptor functional groups on the photophysical properties. Eventually comparing experimental spectral emission and DFT computations were envisage understanding the changes of the electronic transition, energy levels, and electronic orbital distribution in the substituted quinazoline structure. These compounds have good fluorescent Brightening properties hence studied and applied as fluorescent Brightening Agent on polyester fiber.

  • 2-Methyl-4-oxo-N-(4-oxo-2-phenyl substituted-1,3-thiazolidin-3-yl)-3,4-dihydroquinazoline-5-carboxamides—A New Range of Fluorescent Whiteners: Synthesis and Photophysical Characterization
    Journal of Fluorescence, 2014
    Co-Authors: Vikas S Patil, Vikas S Padalkar, Nagaiyan Sekar

    Abstract:

    Fluorescent quinazolinones were synthesized form ethyl 2-methyl-4-oxo-3,4-dihydroquinazoline −5-carboxylate intermediate. The photophysical properties of the compounds were evaluated in DMF solvent. The experimental absorption and emission of the compounds were compared with the vertical excitation and emission obtained Density Functional Theory (DFT) and Time Dependent Density Functional Theory (TD-DFT) computation. Application of the fluorescent compounds as a fluorescent Brightening Agent was tested on polyester fiber. Changes in the electronic transition, energy levels, and orbital diagrams of quinazolin-4(3 H )-one analogues were investigated using the DFT computations and were correlated with the experimental spectral data. The experimental absorption and emission wavelengths are in good agreement with those predicted using the DFT and TD-DFT.

Vikas S Patil – 2nd expert on this subject based on the ideXlab platform

  • synthesis of 2 methyl 5 5 phenyl substituted 1 3 4 oxadiazole 2 yl quinazolin 4 one fluorescent Brightening Agent computational and experimental comparison of photophysical structure
    Journal of Molecular Structure, 2019
    Co-Authors: Vikas S Patil, Vikas S Padalkar, Nagaiyan Sekar, Satish V Patil, Jamatsing D Rajput

    Abstract:

    Abstract Report is about the synthesized new range of oxadiazole substituted quinazoline and studied its electronic distribution to attribute fluorescent properties. B3LYP Density Functional Theory (DFT) computational optimization was studied to observe the effect of electron donor and acceptor substituent’s on photophysical properties, electronic state and energy level. DFT computational optimization was performed by Polarizable Continuum Model (PCM) of solvation strictly in the gas phase and DMF maintaining C1 symmetry in ground state geometry structure. UV–vis and fluorescence spectroscopic methods help in understanding the relationship between the electron donor and acceptor functional groups on the photophysical properties. Eventually comparing experimental spectral emission and DFT computations were envisage understanding the changes of the electronic transition, energy levels, and electronic orbital distribution in the substituted quinazoline structure. These compounds have good fluorescent Brightening properties hence studied and applied as fluorescent Brightening Agent on polyester fiber.

  • 2-Methyl-4-oxo-N-(4-oxo-2-phenyl substituted-1,3-thiazolidin-3-yl)-3,4-dihydroquinazoline-5-carboxamides—A New Range of Fluorescent Whiteners: Synthesis and Photophysical Characterization
    Journal of Fluorescence, 2014
    Co-Authors: Vikas S Patil, Vikas S Padalkar, Nagaiyan Sekar

    Abstract:

    Fluorescent quinazolinones were synthesized form ethyl 2-methyl-4-oxo-3,4-dihydroquinazoline −5-carboxylate intermediate. The photophysical properties of the compounds were evaluated in DMF solvent. The experimental absorption and emission of the compounds were compared with the vertical excitation and emission obtained Density Functional Theory (DFT) and Time Dependent Density Functional Theory (TD-DFT) computation. Application of the fluorescent compounds as a fluorescent Brightening Agent was tested on polyester fiber. Changes in the electronic transition, energy levels, and orbital diagrams of quinazolin-4(3 H )-one analogues were investigated using the DFT computations and were correlated with the experimental spectral data. The experimental absorption and emission wavelengths are in good agreement with those predicted using the DFT and TD-DFT.

Chris D Geddes – 3rd expert on this subject based on the ideXlab platform

  • metal enhanced fluorescence of the fluorescent Brightening Agent tinopal cbx near silver island film
    Dyes and Pigments, 2011
    Co-Authors: Hirdyesh Mishra, Yongxia Zhang, Chris D Geddes

    Abstract:

    Abstract Metal-enhanced fluorescence (MEF) studies of the optical brightener Tinopal-CBS (4,4′- distyrylbiphenyl sulfonic sodium salt) have been undertaken using steady-state and time resolved fluorescence measurements on silver island films (SiFs) deposited on glass slides and silver nano-particles adsorbed onto cellulose based filter paper. Nearly a 4.5 fold enhancement in fluorescence intensity is observed from both SiFs and nano-particle deposited cellulose filter paper. In addition an enhanced photostability and decrease in decay time is also observed on SiFs. These results are consistent with two distinct mechanisms of MEF, firstly coupling and transferring of the excited states energies of fluorophores to surface plasmons in the silver island deposited glass films, and secondly, an electric field enhancement effect, which facilitates enhanced absorption of the fluorophores. Our findings reveal significant benefits of enhanced luminescence and prolonged photostability of Tinopal CBS. As such, Plasmon-tinopal constructs offer new material opportunities as well as multifarious applications in the life sciences.