Optical properties of sol-gel materials doped with ethyl 2-(7-hydroxy-2-oxo-2H-chromen-4-yl) acetate

Abstract

KEYWORDSTransparent sol-gel glassy monoliths doped with coumarin molecules [ethyl 2-(7-hydroxy-2-oxo-2H-chromen-4-yl) acetate] displaying a strong blue luminescence are characterized by optical spectroscopy, X-Ray diffraction, SEM and TG/FT-IR spectroscopy. The UV/Vis, luminescence and excitation spectra of the doped sol-gel materials and of ethanol solutions of coumarin are discussed. The coumarin optical spectra are used as a probe for incorporation in the gel structure. CoumarinOptical spectroscopy Sol-gel method

Growth, spectral and thermal studies of ibuprofen crystals

“…Further, the transmittance spectra of ibuprofen crystal shows that there is no absorption above the wavelength 350 nm, and hence the crystal may be used for optical window applications in the entire visible region. The peaks observed at 270 and 330 nm in transmittance spectra are due to n →π* transition of carbonyl group (C=O) [27,28].…”