Topic
Xanthene
About: Xanthene is a research topic. Over the lifetime, 2132 publications have been published within this topic receiving 34803 citations. The topic is also known as: Xanthene & dibenzo[a,e]pyran.
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TL;DR: In this paper, the liquid-liquid extraction of ion-pair complexes of zinc(II), copper(II) and cadmium (II) is described, and the apparent extraction constants (D′c) are reported.
16 citations
TL;DR: In this paper, the fluorescence quenching of xanthene dyes by TiO2 has been investigated using steady state technique and the quencher was found to obey Stern-Volmer equation and the corresponding Stern-volmer plots were linear in the range of quenchers concentration.
Abstract: The fluorescence quenching of xanthene dyes by TiO2 has been investigated using steady state technique. The dyes used are eosin, rhodamine B, rhodamine 6G. The quenching was found to obey Stern-Volmer equation and the corresponding Stern-Volmer plots were linear in the range of quencher concentration used [0–5 × 10--5] M. The quenching rate constant (kq) is in the range of 0.77–8.30 × 1012 M-1 s-1. This study reveals effective quenching of xanthene dyes with TiO2. The quenching of xanthene dyes followed electron transfer mechanism.
16 citations
TL;DR: The reaction between aromatic aldehydes, dimedone (5,5-dimethyl-1,3-cyclohexane dione) and 2-naphthol catalysed by nanoparticle silica supported sulfuric acid (NPs SiO2-H2SO4) in CH2Cl2 as a solven...
Abstract: The reaction between aromatic aldehydes, dimedone (5,5-dimethyl-1,3-cyclohexane dione) and 2-naphthol catalysed by nanoparticle silica supported sulfuric acid (NPs SiO2-H2SO4) in CH2Cl2 as a solven...
16 citations
TL;DR: In this article, nano-snCl4∙SiO2 is used for the synthesis of 14-aryl or 14-alkyl-14H-di-benzo[a,j]xanthene under solvent-free condition.
Abstract: 2-Naphthol and various aldehydes were used for the synthesis of 14-aryl- or 14-alkyl-14H-di-benzo[a,j]xanthene in the presence of nano-SnCl4∙SiO2 under solvent-free condition. Nano-SnCl4∙SiO2 is an efficient, readily available, and reusable catalyst for this reaction resulting in good to excellent yields.
16 citations
TL;DR: Results signify the importance of xanthene-1,8-dione derivatives as potential antioxidant and antiproliferative agents.
Abstract: Ten biologically active 2,2,5,5-tetramethyl-9-aryl-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-dione derivatives were synthesized and their structures were confirmed by IR, 1H and 13C NMR spectroscopy and mass spectrometry. Synthesized compounds were scanned for their antioxidant, antimicrobial and antiproliferative activity. Antibacterial activity was tested by the diffusion and dilution method against Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa, while antifungal activity was tested against Candida albicans and Saccharomyces cerevisiae. Antiproliferative activity was tested against HeLa (cervical carcinoma), SW620 (colorectal adenocarcinoma, metastatic), hepatocellular carcinoma (HEpG2), lung carcinoma cells (A549) and mouse embryo fibroblast cell line (3T3). The best antioxidant activity showed compound 2 with two hydroxy groups substituted on phenyl ring in positions 2' and 3'. The best antimicrobial activity of all synthesized compounds showed compound 8, while the best antiproliferative activity showed compound 6. Results signify the importance of xanthene-1,8-dione derivatives as potential antioxidant and antiproliferative agents.
15 citations