On the ground and excited state dipole moments of dansylamide from solvatochromic shifts of absorption and fluorescence spectra

Solvent effect on the spectral properties of dipolar laser dyes: Evaluation of ground and excited state dipole moments

“…Solvent polarity is the most significant property which can alter the position of the absorption or emission band of molecules by solvating a solute molecule or any other molecular species introduced into the solvent milieu. Numerous articles on the studies of simple organic molecules with regard to their interactions in different solvents are reported in literature [2][3][4][5][6][7][8][9]. On the other hand, the fluorescent dye molecules are complex organic molecules which might carry charge centers and are thus prone to absorption changes in different media [10,11].…”

Конформеры И Электронные Спектры Дансиламида: Экспериментальные И Теоретические Исследования

“…5 представлены зарегистрированные нами спектры погло-щения водных растворов дансиламида с концентрациями 4 · 10 −4 mol/l и 2 · 10 −4 mol/l. Максимум полосы погло-щения λ 1 max водного раствора дансиламида составил 326 nm, что согласуется с литературными данными для других протонных растворителей [8]. Также на графике обозначены максимумы полос поглощения λ 2 max и λ 3 max , которые составили 214 и 244 nm.…”

“…Так, в работе [8] показано, что максимум полосы поглощения для дансиламида наблюдается при 332 nm в случае протонных растворителей (метанол, этанол, пропанол и др.). В случае апротонных растворителей он сдвигается, например, в дихлорметане к 343 nm.…”

Thermal and solvatochromic effects on the emission properties of a thienyl-based dansyl derivative

“…[21][22][23] From a fundamental point of view, understanding the electronic transitions in highly conjugated organic compounds is still a timely topic due to the rich phenomenology associated with intramolecular charge transfer (ICT), [24][25][26] thermal, 27 and solvatochromic effects. 7,28,29 Over the past decades, several studies have been devoted to the characterization of the emission and electronic properties of compounds based on 1-(dimethylamino)-naphthalene-5sulfonyl, [30][31][32][33][34][35][36][37][38][39][40][41] known as dansyl derivatives. The main reason is that dansyl derivatives tend to exhibit broad emission spectra upon low-intensity UV excitation, 30,31,33 with high quantum yields even under different external conditions.…”

“…16,[43][44][45] Further, the solvatochromic and thermal effects on the uorescence properties of such compounds have attracted remarkable interest. 30,[33][34][35][46][47][48][49][50] In particular, their emission mechanism has been described in terms of 1 L a and 1 L b locally excited states, 30,31,34,40,48 and may involve an intramolecular charge transfer and a mixing of p / p* and n / p* electronic transitions in the naphthalene core and the amino group, respectively. In addition, experimental studies have veried that dansyl derivatives exhibit a signicant Stokes shi as the solvent polarity is increased, [33][34][35]49 with a considerable change in molecular dipole moment.…”