Results 211 to 220 of about 5,075 (257)

Spirolactones of xanthene. III. Formation and molecular structure of novel spirolactones of xanthene and dibenzo[c,h]xanthene

Journal of Heterocyclic Chemistry, 1987
AbstractThe reaction of 1‐naphthol or phenol derivatives with oxalic and sulfuric acids yielded novel spirolactones. Eight examples (2a‐h) were synthesized by this reaction. The structures of the spirolactones were established from spectral evidence and the X‐ray diffraction studies. Some of the spirolactones form the solvates with the aromatic solvent
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Photophysical characterization of xanthene dyes

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
The growing interest in using photodynamic therapy for cancer treatment and antimicrobial applications has prompted the search for different classes of dyes. In general, the protocols of these studies are different, making it difficult to compare their efficiency directly.
Eduardo V. Bergmann, Ana P.B. Cavalaro, Newller M. Kimura, Vitor S. Zanuto, Nelson G.C. Astrath, Leandro S. Herculano, Luis C. Malacarne   +6 more
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Photophysics of xanthene dyes in surfactant solution

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2005
The spectral (both absorption and fluorescence) and photoelectrochemical studies of some anionic xanthene dyes namely erythrosine B, rose bengal and eosin have been carried out in micellar solution of cationic cetyl trimethyl ammonium bromide (CTAB), anionic sodium dodecyl sulphate (SDS) and neutral triton X-100 (TX-100).
Benoy B, Bhowmik, Papia, Ganguly
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Magnetic nanocatalysts in synthesis of xanthenes

Synthetic Communications, 2020
Molecules containing xanthene moieties are known to have a diverse library of applications in medicinal, bioorganic, and agriculture chemistry.
Muhammad Aqeel Ashraf, Zhenling Liu, Cheng Li, Dangquan Zhang   +3 more
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Xanthene-Modified and Hangman Iron Corroles

Inorganic Chemistry, 2011
Iron corroles modified with a xanthene scaffold are delivered from easily available starting materials in abbreviated reaction times. These new iron corroles have been spectroscopically examined with particular emphasis on defining the oxidation state of the metal center.
Matthias, Schwalbe, Dilek K, Dogutan, Sebastian A, Stoian, Thomas S, Teets, Daniel G, Nocera   +4 more
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Adsorption of Xanthene Dyes by Lysozyme Crystals

Langmuir, 2005
Adsorption characteristics of cross-linked lysozyme crystals of different morphologies (tetragonal, orthorhombic, triclinic and monoclinic) were examined using four anionic dyes (fluorescein, eosin, erythrosin, and rose bengal), one zwitterionic dye (rhodamine B), and one cationic dye (rhodamine 6G).
Cvetkovic, A., Straathof, A.J.J., Krishna, R., van der Wielen, L.A.M.   +3 more
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Xanthenes: fluorone derivatives. 1

The Journal of Organic Chemistry, 1992
Several new fluorone derivatives including 2,4,5,1-tetraiodo-6-hydroxy-3-fluorone, 2,4,5,1-tetrabromo-6-hydroxy-3-fluorone, and 2,4-diiodo-6-methoxy-3-fluorone were synthesized and their spectral and photophysical properties ...
Jianmin Shi, Xianping Zhang, Douglas C. Neckers   +2 more
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ChemInform Abstract: Spirolactones of Xanthene. Part 3. Formation and Molecular Structure of Novel Spirolactones of Xanthene and Dibenzo(c,h)xanthene.

ChemInform, 1987
Abstract1‐Naphthol (I) or the substituted phenols (IV) react with oxalic acid in the presence of sulfuric acid to give the spiro‐γ‐lactones (III) or (V) which form solvate complexes with aromatic solvent molecules such as toluene, xylene, or nitrobenzene.
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Photochemistry and photophysics of hydroxyfluorones and xanthenes

Journal of Photochemistry and Photobiology A: Chemistry, 1996
Abstract Laser-initiated photopolymerization has opened the doors to the rapid prototyping revolution. Driven by computer control, the polymerization process can create plastic models which conform accurately to a programmed design in three dimensions.
D.C. Neckers, Salah Hassoon, Elena Klimtchuk   +2 more
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Xanthenes in Medicinal Chemistry – Synthetic strategies and biological activities

European Journal of Medicinal Chemistry, 2021
MIGUEL Maia, Diana I S P Resende, Fernando Durães   +2 more
exaly