Literatura científica selecionada sobre o tema "Halochromique"
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Artigos de revistas sobre o assunto "Halochromique"
Reichardt, Christian, Gerhard Schäfer e Piotr Milart. "Synthese und UV/VIS-spektroskopische eingenschaften solvatochromer and halochromer methansulfonyl-substituierter pyridinium-N-phenolat-betainfarbstoffe". Collection of Czechoslovak Chemical Communications 55, n.º 1 (1990): 97–118. http://dx.doi.org/10.1135/cccc19900097.
Texto completo da fonteSmets, G., e A. Delvaux. "Azométhines et halochromie". Bulletin des Sociétés Chimiques Belges 56, n.º 1-4 (1 de setembro de 2010): 106–33. http://dx.doi.org/10.1002/bscb.19470560112.
Texto completo da fonteJeoung, Sae Chae, Dongho Kim, Dae Won Cho e Minjoong Yoon. "Transient Absorption and Resonance Raman Investigations on the Axial Ligand Photodissociation of Halochromium(III) Tetraphenylporphyrin". Journal of Physical Chemistry A 104, n.º 21 (junho de 2000): 4816–24. http://dx.doi.org/10.1021/jp9920287.
Texto completo da fonteDufraisse, M. Charles, Jean Lefrancq e Pierre Barbieri. "Etude sur le Mécanisme de la Réaction Rubrénique: Le bis(p-diméthylaminophényl)phényléthynylcarbinol, ses propriétés halochromiques: Un colorant vert à fonction acétylénique". Recueil des Travaux Chimiques des Pays-Bas 69, n.º 3 (2 de setembro de 2010): 380–90. http://dx.doi.org/10.1002/recl.19500690319.
Texto completo da fonteTeses / dissertações sobre o assunto "Halochromique"
Sardhalia, Vaskar. "Calcium carbonate-naphthoquinone hybrid pigments inspired by biomineral coloration in sea urchins". Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS644.pdf.
Texto completo da fonteThe vibrant colors seen in adult sea urchin biominerals, ranging from purple to green, are attributed to the presence of polyhydroxylated naphthoquinone molecules (PHNQs). These PHNQs become integrated into calcite, likely during the crystal growth, which occurs through amorphous calcium carbonate (ACC) precursors. The mineral formation in sea urchins is accompanied by color changes depending upon the stage of mineralization. Spinochrome A, for example, exhibits a red color when extracted from the purple spines of Paracentrotus lividus in acidic conditions, indicating a potential link between pH and color variations, as observed in CaCO3 formation. To delve deeper into color variations and the impact of naphthoquinones on ACC crystallization, we performed CaCO3 precipitation in the presence of PHNQs (extracted from sea urchin spines) and commercially available natural naphthoquinones (naphthazarin, lawsone, and juglone). We monitored pH levels throughout the formation of colored ACC and its crystallization into calcite. Various analytical techniques, including DSC/TGA, XPS, PDF analysis, UV-Vis, STEM-EELS, ss-NMR spectroscopy, and HR-XRD, were employed to characterize the properties of the amorphous and crystalline hybrid pigments. Our results reveal that different pigments can create a spectrum of colored calcite. For instance, naphthazarin, transitioning from red at acidic pH, turns medium blue before ACC precipitation, culminating in lavender blue calcite due to successive O-H deprotonation/protonation. The effect of increasing naphthazarin concentration on ACC's stability against crystallization in solution and air followed different trends without affecting the local structure of the ACC. Quantification of naphthazarin associated with ACC and calcite revealed that only a tiny fraction of naphthazarin associated with ACC gets incorporated within the calcite in the form of non-homogeneous nano inclusions; the rest was adsorbed on the surface with strong chemical or physical forces. Furthermore, spinochrome A yields purple calcite, while spinochrome B and E produce yellowish calcite. HR-XRD analysis indicates that spinochrome B and E induce more significant distortions in calcite lattice than spinochrome A. Moreover, spinochrome A increased the stability of the intermediate polymorph, thus modifying the crystallization pathway. The combination of minimal atomic structural effects and intense coloring suggests a preference for incorporating spinochrome A in the purple spines of P. lividus. The PHNQs extracted from sea urchin spines and hybrid pigment were tested for textile dyeing, showcasing promising results in the case of biogenic PHNQs and ACC-based hybrid pigments