Effect of solvent on the fluorescence quenching of organic liquid scintillators by aniline and carbon tetrachloride

Role of solvent polarity on the fluorescence quenching of newly synthesized 7,8-benzo-4-azidomethyl coumarin by aniline in benzene–acetonitrile mixtures

“…2. Similar experimental results were also observed by others [4][5][6][7][8]. Thus, positive deviation from linearity suggests that quenching is not purely collisional and reveals the role of the static quenching process.…”

“…K SV is the S-V constant and [Q] is the quencher concentration. But in some cases, it has been observed that the experimental results show positive deviation from a linear S-V relation [4][5][6][7][8]. This positive deviation is attributed to various processes like intersystem crossing, formation of charge transfer complexes both at ground and excited states, static and dynamic quenching, etc.…”

“…has been studied by several investigators by steady state [1][2][3][4][5][6][7][8] and transient methods [9][10][11][12][13]. In almost all the cases, the experimental results follow the linear Stern-Volmer (S-V) relation and is given by…”

Fluorescence quenching of newly synthesized biologically active coumarin derivative by aniline in binary solvent mixtures

“…Coumarins and its derivatives have been a subject of considerable interest in numerous fields [23][24][25]. In literature, there are only few reports on fluorescence quenching of fluorescent compound in binary mixtures [26][27][28][29][30]. The interesting properties associated with coumarins, motivated us for the present investigation.…”

“…have been studied by several investigators [3][4][5][6][7][8][9][10][11][12][13][14][15] by steady-state and transient methods [16][17][18][19]. The quenching mechanism is important not only in physical science, but also in chemical, biological, and medical sciences.…”