In this work, we have utilized a supramolecular approach to control emission, and generate white light applied the system both 3D printing counterfeiting applications. particular, report two new dual-mode orthogonal tunable fluorescence systems, A B. System is based on fluorescent dyes perylene diimide (PDI-C6) 7-hydroxycoumarin, which are incorporated into main guest system, namely cucurbit[8]...

We synthesized four novel benzoxazolic and benzimidazolic derivatives of 6-hydroxycoumarin and their photophysical properties were studied. The products with brilliant yellow color shades declared green fluorescence. The emission peaks of the products appeared 456–474 nm. The important characteristic for fluorescent compounds, the Stokes shift νA-νF, oscillator strength f, and fluorescence quan...

In this work, a series of anti-tyrosinase and anti-butyrylcholinesterase coumarin derivatives 4a–f 5a–f were synthesized starting from 4-hydroxycoumarin. The condensation 2-(arylimin)-4-hydroxycoumarins 3a–f with dimethylformamide dimethyl acetal (DMF-DMA), used as key reaction, afforded the precursors 4a–f, whose acid treatment led to formation 5a–f. These prepared heterocycles characterized b...

p-Dodecylbenzenesulfonic acid (DBSA) was used as a catalyst for a simple and efficient one-pot synthesis of aryl substititued tetrahydrobenzo[b]pyrans and dihydropyrano[c]chromens via initial Knoevenagel, subsequent Micheal and final heterocyclization reactions of aryl aldehyde, malononitrile and 4-hydroxycoumarin/dimedone in moderate to excellent yields. The present method was operationally si...

A highly efficient and general method for the synthesis of aryloylamido coumarinsderivatives by a three-component condensation of 4-hydroxycoumarin or 4-hydroxy-6-methylpyran-1-one, aryl glyoxals and benzamide in the presence of nano silica supported tin(II) chloride as a heterogeneous catalyst is established. In this method, SnCl2/nano SiO2 wasused as green and reusable catalyst. Excellent yie...

1. Fluorescence changes of umbelliferone have been used as indicator for pH changes in the outer phase of the functional membrane of photosynthesis. In combination with the repetitive pulse technique it is possible to measure the pH change which is produced during one turn-over of the molecular machinery {A pH 10-4) . The analysis of this primary pH changes gives insight in the primary ionic ev...

Chemical sense-related lipophilic ligand-binding protein (CRLBP) is an insect odorant-binding protein (OBP) found abundantly in the taste and olfactory organs of the blowfly, Phormia regina. Through computational construction, a three-dimensional molecular model of a CRLBP indicated good fitting to a fluorescent ligand, 7-hydroxycoumarin (7-HC), in its ligand-binding pocket. By showing that the...