Fluorescent 7-Substituted Coumarin Dyes: Solvatochromism and NLO Studies

Coumarin and Hydroxyl Decorated Viscosity Sensitive Triphenylamine Derivatives: Synthesis, Photophysical Properties, Viscosity Sensitivity, TD‐DFT, and NLO Properties

“…The magnitudes calculated for μ, α 0 , Δ α , β 0 and γ for the molecules by DFT computational method using CAM−B3LYP and BHandHLYP functional and the basis set, 6–31+g(d,p) are summarized in Table and Table S10 . These compounds show higher values of μ, α 0, β 0 and γ compared to those without hydroxy, monocoumarin compound 6c . They show polarizability around 71.82‐129.23x10 ‐24 e.s.u, β 0 around 115–206x10 ‐30 e.s.u, The compound MHDC shows comparatively fewer values of β 0 , 65–141×10 ‐30 e.s.u.same trend is observed for a solvatochromic method where values of β 0 for dicoumarin is comparatively lower than monocoumarins also second order hyperpolarizability γ o for all the three compounds is found to be 558–2120×10 ‐36 e.s.u.…”

“…The quantum yield of 6c is calculated using fluorescein while in the case of our synthesized compounds, quantum yields are calculated using coumarin 6 as reference standard as fluorescein is not very stable at room temperature . All these compounds show a bathochromic shift in both absorption and there is an increase in quantum yield values . The comparison is given in Table and Figure S5 .…”

“…Absorption and emission wavelengths, Stokes shift, molar absorptivity FWHM and quantum yield of all three derivatives were compared with plane triphenylamine coumarin derivative (6c) in chloroform solvent. [48] All these compounds show a bathochromic shift in absorption and there is an increase in quantum yield values observed in all three derivatives due to the presence of adjacent hydroxyl group compared to the triphenylamine coumarin derivativesdevoid of the hydroxyl group. Positive solvatochromism is confirmed using Lippert Mataga solvent polarity plots.…”

“…[51] All these compounds show a bathochromic shift in both absorption and there is an increase in quantum yield values. [48] The comparison is given in Table 2 and Figure S5.…”

“…These compounds show higher values of μ, α 0, β 0 and γ compared to those without hydroxy, monocoumarin compound 6c. [48] They show polarizability around 71.82-129.23x10 -24 e.s.u, β 0 around 115-206x10 -30 e.s.u, The compound MHDC shows comparatively fewer values of β 0 , 65-141 × 10 -30 e.s.u.same trend is observed for a solvatochromic method where values of β 0 for dicoumarin is comparatively lower than monocoumarins also second order hyperpolarizability γ o for all the three compounds is found to be 558-2120 × 10 -36 e.s.u. The values of μ, α, β, and γ increase with increasing solvent polarity.…”