Thiazine dyes: Evaluation of monomeric and aggregate forms

2016 ◽  
Vol 166 ◽  
pp. 112-120 ◽  
Author(s):  
Jimena Vara ◽  
Cristina S. Ortiz
Keyword(s):  
Thiazine Dyes

scholarly journals Cyclic Voltammetric Investigations of Thiazine Dyes on Modified Electrodes

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Amitabha Chakraborty ◽  
Shamsuzzaman Ahamed ◽  
Subrata Pal ◽  
Swapan K. Saha
Keyword(s):  
Diffusion Coefficient ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Electrochemical Behavior ◽  
Modified Electrodes ◽  
Electron Hopping ◽  
Cyclic Voltammetric ◽  
Peak Current ◽  
Quantitative Characteristics ◽  
Thiazine Dyes

Electrochemical behavior of five progressively alkylated thiazine dyes has been investigated at glassy carbon/montmorillonite and glassy carbon/zeolite electrodes. Quantitative characteristics, associated with the positions of peak potentials (Ea and Ec) and current ratios (ia/ic), are measured with scan rates. The peak current observed in the modified electrodes is dependent on both the porosity and nature and number of sites involved in partitioning the complex into film. The values of diffusion coefficient for different dyes have been calculated from electrochemical data. It is suggested that in clay-modified electrode along with physical diffusion the process of electron hopping seems to be most likely.

The Roles of Solute-Solute and Solute-Solvent Interactions on the Nonlinearity of Aqueous Solutions of Ionic Dyes

2018 ◽  
Vol 73 (9) ◽  
pp. 785-794 ◽  
Author(s):  
Mahsa Khadem Sadigh ◽  
Mohammad Sadegh Zakerhamidi
Keyword(s):  
Intermolecular Interactions ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Solvent Interactions ◽  
Nonlinear Responses ◽  
Thiazine Dyes ◽  
J Aggregates ◽  
High Concentrations ◽  
Dye Solutions ◽  
Media Characteristics

AbstractIn this paper, the roles of intermolecular interactions and probability of aggregates formation on the nonlinear optical properties of thiazine dyes are investigated. Our results show that saturable and reverse saturable absorption properties of these dyes depend strongly on the molecular surrounding media characteristics and their collective properties that tend to form aggregated species at high concentrations. Depending on molecular surrounding media characteristics, by increasing the concentration of dye solutions and formation of aggregates, the strong solute-solute interactions can modify the nonlinear responses of dye solutions. The experimental results indicate that by increasing the contribution of J aggregates, the third-order nonlinear responses of binary mixtures of water and ethanol are increased at room temperature. Therefore, the intermolecular interactions and the presence of J aggregates can be considered as simple techniques for improving the nonlinear responses of selected ionic dyes.

Nile Blue Inducible Fluorescence of Tumour Cells

1972 ◽  
Vol 27 (11) ◽  
pp. 1395-1398 ◽  
Author(s):  
A. L. Bastos ◽  
Dante Marques
Keyword(s):  
Phase Contrast ◽  
Unsaturated Fatty Acids ◽  
Nile Blue ◽  
Tumour Cells ◽  
Phase Contrast Microscopy ◽  
Cytoplasmic Granules ◽  
Deep Blue ◽  
Contrast Microscopy ◽  
Thiazine Dyes ◽  
Molecular Nature

An oxazine dye, Nile Blue sulfate, induces a fluorescent reaction in cytoplasmic granules (NBIFG) of living or fixed tumour cells in the same manner as reported before for Thiazine dyes.The NBIFG correspond to phase contrast positive granules when cells are viewed by phase contrast microscopy. Fluorescence disappears from NBIFG in a matter of 2—4 days and the bodies turn deep blue. These granules have a succinate dehydrogenase (SDG) activity and are negative for acid phosphatase, peroxidasic activity and porphyrin.The cytological findings support the assumption that Nile Blue sulfate forms a salt linkage with unsaturated fatty acids of NBIFG which also show an oxi-reductive activity. The molecular nature of the fluorophore (s) is (are) unknown.

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