... in a variety of solvents with varying polarities to demonstrate positive solvatochromism correlated with intramolecular charge transfer (ICT). The probe’s quantum yields (Фf) are experimentally measured in ethanol, and the Stokes shifts are found to be in the 4846–9430 cm⁻¹ range. Originality...

...(1H)-one Azo dyes Geometrical isomers Solvatochromism UV-vis Tautomerism Next, the azo dyes 2 – 8 (Scheme 1) were synthesized by the coupling reaction of diazotised aromatic amines with compound 1 under basic condition and then neutralisation with hydrochloric acid solution at 0–5°C...

... Azo dyes UV-vis Solvatochromism DFT calculations All starting materials were purchased from Merck and Aldrich chemical companies and were used without further purification. The Fourier transform infra red (FT-IR) spectra of the compounds were obtained using a Perkin Elmer FT-IR...

... methods. Solvatochromic behavior of U/THB dyes has been studied in different polar protic solvents at room temperature. Findings The absorption spectra distinguish two main bands at (350 nm–442 nm) and (308 nm–382 nm) referring to n-π* and π- π* transitions of the azo groups. Dimethyl formamide...

... Organic compounds 4‐hydroxycoumarine derivatives UV/VIS properties Solvatochromism Ultraviolet radiation Coumarins are simple organic molecules, present in several areas of synthetic chemistry, medicinal chemistry and photochemistry (Borges et al., 2005). They constitute important...