Luminescence-spectral characteristics and conformational transformations in the electronically excited state of the dimethylaminophenyl derivatives of pyridine and pyridinium and pyrylium cations

Excited-state relaxation of bridged and unbridged anilino-pyridinium dyes

“…The large fluorescence quantum yield of 3 can be understood by experiments on 1 at low temperature which show that the fluorescence intensity strongly increases by cooling to 140 K or 77 K (U f = 0.49 in EtOH at 140 K) [3,9]. This leads to the conclusion that 1 possesses, in contrast to the bridged compound 3, a very efficient nonradiative channel, probably linked with intramolecular twisting of the rings towards a CT state with forbidden emission properties [10].…”

“…The fluorescence of the pyridinium salts 4dpy_m and 4dpy_s have recently been studied [1][2][3] in the context of fluorescence probes for electrical pulses in nerve membranes [4,5].…”

Синтез И Фунгибактерицидная Активность Производных 4-(4-Диметиламинофенил)пиридина

“…Ñâåäåíèÿ î òåõíè÷åñêîì ïðèìåíåíèè ñîåäèíåíèÿ I âåñüìà îãðàíè÷åíû. Óïîìèíàåòñÿ ëèøü îá èññëåäîâàíèè ëþìèíåñöåíòíûõ ñâîéñòâ I è åãî àðèëüíûõ ïðîèçâîäíûõ [9]. Ëèòåðàòóðíûå äàííûå î áèîëîãè÷åñêîé àêòèâíîñòè I íà íàñòîÿùèé ìîìåíò îòñóòñòâóþò [10].…”