Synthesis, characterization and colour determination using CIELAB colour space of stilbene dyes

Grad, Maria; Simu, Georgeta Maria; Muntean, Simona Gabriela; Ilia, Gheorghe

doi:10.1007/s13738-012-0216-y

Cited by 9 publications

(2 citation statements)

References 34 publications

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“…A significant negative b* value correlates to the color blue. Although there is no fixed range for b*, the values often lie between [−100, 100] according to CIE 1976 (Cinko & Becerir, 2019;Grad et al, 2013;Yeerken, 2017). The colors with "+" values (red and yellow) are considered "hot", while those with "−"values (green and blue) are regarded as "cold".…”

Section: General Conceptmentioning

confidence: 99%

Quantitative Weathering Assessment of Rock Slope using CIELAB Color Space and Image Analysis Technique

Razali¹,

Jamal²,

Ismail³

et al. 2021

Preprint

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Quantitative weathering assessment using color changes is one of the new tools for slope stability assessment. In many other engineering field, CIELAB color space and image analytical tools have aided in enhancing the conventional method or inaccuracy due to the subjective and qualitative nature of visual assessment. This study focuses on the granitic rock slope surface assessment because of the predominant rock formation of granite in Malaysia. The 3D model of the rock slope was analyzed to extract the geological planes using compass plugin in Cloud Compare software and verified by manual compass mapping via scanline survey. Findings show that the a* and b* values increased with an increase in weathering results. This study focuses on the 50 points of measurement of rock slope and indicated a positive correlation of a* and b* with R2=0.9027. The image analysis result of the rock slope shows that major zoning (74%) is susceptible to failure due to structural control whilst another 26% are controlled by significant weathering in the grade IV-VI. This outcome is strongly verified via a geomechanical test, geological structure, and mineralogical assessment. The aforementioned mechanism is recommended in any geotechnical and technical purpose in enhancing the method of weathering assessment because image analysis provides reliable measurements in addition to the manual visual inspection.

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Section: General Conceptmentioning

confidence: 99%

Quantitative Weathering Assessment of Rock Slope using CIELAB Color Space and Image Analysis Technique

Razali¹,

Jamal²,

Ismail³

et al. 2021

Preprint

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“…The azo dyes are the most important class of organic dyes, due to the extended areas of use, such are: different industries (textile, coating, polymer, photography, printing and ceramic), optical fields (lasers, optical sensors, photochromic materials), nearly all foods and cosmetics, medicine (pharmaceutical products, photodynamic therapy, antimicrobial activity) etc. [4][5][6][7][8]. Generally, metal complex of azo dyes are formed from the reaction of transition metal ions with ligands in which the ortho positions adjacent to the azo group contain groups capable of coordinating with metal ions.…”

Section: Introductionmentioning

confidence: 99%

Amido Black 10B Dye Copper Complex�Synthesis, Characterization and Color Analysis

Rădulescu-Grad¹,

Vlase²,

Ilia³

et al. 2020

Rev. Chim.

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The present paper presents the obtaining and the characterization of a new complex acid dye by combining the transition metal Cu (II) with an azo acid dye, namely Amido Black 10B (C.I. 20.470), as ligand. The ligand and the resulted new azo complex were characterized by FT/IR spectroscopy, UV-Vis spectroscopy, AAs spectrometry, thermal analysis, and PXRD spectrometry. The structure of the ligand and the structure of the new synthesized copper complex were elucidated by all the above mentioned analysis methods. The formation of the azo metal complex with Cu(II) was confirmed by UV-Vis spectrum. Thermogravimetric and spectral analysis reveal its different stability in the air and nitrogen atmosphere, with high nitrogen stability. The PXRD analysis shows crystalline structure for the copper complex. At the same time, the color analysis was performed for the ligand and the synthesized complex in powder by means of UV-Vis CIEL*a*b* color space parameters, under the CIE recommended illuminants: D65 (natural day light), A (incandescent light) and F2 (fluorescent light) under the standard 10� observer angle. An important color phenomenon, namely metamerism, was highlighted for the complex, as well. Due to the presence of the Cu (II) ions, this azo complex presents a different color, calculated by the color differences AE*ab and AC*, a superior saturation and color strength than its ligand.

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Photophysical Properties and Metal‐Free Synthesis of Thiophene‐Based D─π─A Stilbenes with Enhanced Stokes Shift

Sakthivel,

Singh

2024

ChemistrySelect

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A straightforward and practical nucleophile‐induced synthetic route for the synthesis of thermally stable, fluorescently active, functionalized stilbenes has been developed. The described synthetic method involves nucleophile‐induced, base‐promoted ring transformation reactions following a more traditional approach. All reactions occur at room temperature, yielding high amounts of the desired product with minimal byproducts. Due to the inclusion of a donor‐π‐acceptor system, all the produced stilbenes exhibited impressive emission characteristics. The resulting band gaps ranged from 3.37 to 3.93 eV, indicating a notable redshift. Solvatochromic investigations underscored these positive impacts. Furthermore, the TG‐DTA analysis indicated a single‐step evaporation process, and the compounds exhibited stability up to 375 °C.

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Synthesis, characterization and colour determination using CIELAB colour space of stilbene dyes

Cited by 9 publications

References 34 publications

Quantitative Weathering Assessment of Rock Slope using CIELAB Color Space and Image Analysis Technique

Quantitative Weathering Assessment of Rock Slope using CIELAB Color Space and Image Analysis Technique

Amido Black 10B Dye Copper Complex�Synthesis, Characterization and Color Analysis

Photophysical Properties and Metal‐Free Synthesis of Thiophene‐Based D─π─A Stilbenes with Enhanced Stokes Shift

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