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Journal ArticleDOI

Notes on excited state charge-transfer interaction

01 Jan 1976-Journal of Photochemistry (Elsevier BV)-Vol. 5, Iss: 5, pp 413-414
About: This article is published in Journal of Photochemistry.The article was published on 1976-01-01. It has received 1 citations till now. The article focuses on the topics: Excited state & Charge (physics).
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TL;DR: In this article, the influence of the phase state of the liquid crystalline solvents 4- n -octyl-cyanobiphenyl (8CB) and cholesteryl oleyl carbonate (COC) on the flourescence of the intermolecular perylene exciplex was studied.
Abstract: The influence of the phase state of the liquid crystalline solvents 4- n -octyl-cyanobiphenyl (8CB) and cholesteryl oleyl carbonate (COC) on the flourescence of the intermolecular perylene— N , N -dimethylaniline (DMA) exciplex was studied. The introduction of DMA into perylene solutions in COC or 8CB gives rise to exciplex fluorescence indicated by the extension of the long-wavelength region of the spectrum. Exciplex fluorescence was observed in all phase states of the liquid crystalline solutions, i.e. crystalline, nematic and isotropic phases of 8CB and smectic, cholesteric and isotropic phases of COC. Exciplex formation occurs by a static mechanism in crystalline and smectic phases of 8CB and COC as a result of the excitation of perylene—DMA complexes in the ground state. On going from the smectic to the cholesteric phase of COC, deformation of the exciplex fluorescence band occurs. Similar changes are observed in the case of 8CB. The analysis of the influence of temperature on the fluorescence spectrum of the exciplex shows that, in liquid crystalline solutions, two types of exciplex can exist which differ in their structure and localization within the liquid crystalline matrices.

3 citations

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TL;DR: In this paper, a mixed excimer fluorescence is observed when any one of a variety of aromatic hydrocarbons is added to solutions of 9−cyanoanthracene or 9, 10−dicyanoanthracene.
Abstract: Mixed excimer fluorescence is observed when any one of a variety of aromatic hydrocarbons is added to solutions of 9‐cyanoanthracene or 9, 10‐dicyanoanthracene. The formation of a mixed excimer appears to be markedly dependent upon the ionization potential of the donor. The emission maxima of the 9, 10‐dicyanoanthracene mixed excimers vary linearly with the polarographic oxidation potentials of the donors, a results corresponding to that found for charge‐transfer absorption bands. It is concluded that charge‐transfer interaction is important in the excimer state.

36 citations