Intramolecular exciplex and intermolecular excimer formation of 1,8-naphthalimide-linker-phenothiazine dyads

The Journal of Physical Chemistry. B
Dae Won ChoTetsuro Majima

Abstract

Steady-state fluorescence spectra were measured for 1,8-naphthahlimide-linker-phenothiazine dyads (NI-L-PTZ, where L = octamethylenyl ((CH2)8) and 3,6,9-trioxaundecyl ((CH2CH2O)3C2H4)), NI-C8-PTZ and NI-O-PTZ, as well as the NI derivatives substituted on the nitrogen atom with various linker groups without PTZ as the reference NI molecule in n-hexane. Normal fluorescence peaks were observed at 367-369 nm in all NI molecules together with a broader emission around 470 nm, which is assigned to the excimer emission between the NI in the singlet excited state (1NI*) and the NI moiety of another NI molecule (1[NI/NI]*). In addition, a broad peak around 600 nm was observed only for NI-L-PTZ, which is assigned to an intramolecular exciplex emission between donor (PTZ) and acceptor (NI) moieties in the excited singlet state, 1[NI-L-NI]*. The formation of an intramolecular exciplex corresponds to the existence of a conformer with a weak face-to-face interaction between the NI and PTZ moieties in the excited state because of the long and flexible linkers. The excited-state dynamics of the NI molecules in n-hexane were established by means of time-resolved fluorescence spectroscopy.

References

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Citations

Sep 4, 2014·Journal of Fluorescence·T Sheshashena Reddy, A Ram Reddy
Jul 26, 2008·Physical Chemistry Chemical Physics : PCCP·Dae Won ChoTetsuro Majima
Jul 14, 2010·Organic & Biomolecular Chemistry·Premchendar NandhikondaMichael D Heagy
Feb 19, 2014·Physical Chemistry Chemical Physics : PCCP·Dae Won ChoTetsuro Majima
Nov 16, 2017·Physical Chemistry Chemical Physics : PCCP·Nicholas PearceNeil R Champness
Nov 16, 2018·Chemical Science·Supphachok ChanmungkalakulSuda Kiatkamjornwong
Jul 18, 2008·The Journal of Physical Chemistry. B·Anjun QinBen Zhong Tang
Mar 24, 2011·The Journal of Organic Chemistry·Claudia PercivalleMauro Freccero
Jun 15, 2006·The Journal of Physical Chemistry. B·Dae Won ChoTetsuro Majima

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