Studies on quenching reactions in the excited electronic states of tetrahydronaphthols both at the ambient temperature as well as at 77 K

Fluorescence quenching studies of nitrated polycyclic aromatic hydrocarbons

“…The Stern–Volmer constants, k SV , and the limits of detection (3 σ ) derived from them are summarized in Table 1. The k SV value of 4.0 × 10 4 L mol −1 for 2 NF, combined with a fluorescence lifetime of 5 ns (14), corresponds to a k Q value of 8.0 × 10 12 L mol −1 s −1 , in fair agreement with the findings of Sinha et al . (15).…”

“…(15). The large k Q values of 10 12 L mol −1 s −1 obtained for the quenching of 5678THN1OH donor by 2NF exceeding the diffusion rate was previously explained to be due to a concurrent occurrence of photo‐induced electron transfer and non‐radiative energy transfer between the donor napthols and acceptor 2NF (14).…”

“…Sinha et al . (14) showed that several indoles were quenched by 2‐nitrofluorene with k Q values of up to 10 12 L mol −1 s −1 . The same research group found that 5,6,7,8 tetrahydro‐1‐naphthol and 5,6,7,8‐tetrahydro‐2‐naphthol, which each have τ 0 values of ca 5 ns, were quenched by 2 nitrofluorene with k Q values of >10 11 L mol −1 s −1 (14).…”

“…(14) showed that several indoles were quenched by 2‐nitrofluorene with k Q values of up to 10 12 L mol −1 s −1 . The same research group found that 5,6,7,8 tetrahydro‐1‐naphthol and 5,6,7,8‐tetrahydro‐2‐naphthol, which each have τ 0 values of ca 5 ns, were quenched by 2 nitrofluorene with k Q values of >10 11 L mol −1 s −1 (14). It was proposed that such exceptionally high quenching constants arose because of the simultaneous occurrence of two quenching mechanisms, Förster singlet–singlet energy transfer from the fluorophore to the quencher, which requires the emission spectrum of the former to overlap the absorption spectrum of the latter (15), and a photo‐induced electron transfer process in the same direction.…”

Spectroscopic investigations on Naphthol and Tetrahydronaphthol. A theoretical approach

“…In the present study a conventional type molecule Naphthol, having tetralin like structure and lot of biological and pharmaceutical activities [9][10][11], has been chosen. To substantiate the conclusions of the results, one substituted Naphthol or Tetrahydronaphthol [12] are simulated here along with Naphthol. So positional isomer of Naphthol such as ␣-Naphthol (Naphthol1), ␤-Naphthol (Naphthol2) and positional isomer of Tetrahydronaphthol such as 5,6,7,8-Tetrahydro-1-Naphthol (THN1OH), 5,6,7,8-Tetrahydro-2-Naphthol (THN2OH) are theoretically studied here.…”