Abstract
Photoinduced spectral change can be utilized for various optical devices. The photoinduced spectral change due to an organic dye was demonstrated for the organic-inorganic hybrid film without the aid of photochromism with a simple preparation method for the first time. By the hybridization of a cyanine dye of 2-[5-(1,3-dihydro-3,3-dimethyl-1-octadecyl-2H-indol-2-ylidene)-1,3-pentadienyl]-3,3-dimethyl-1-octadecyl-3H-indolium perchlorate (NK3175) with an inorganic layered material of cation-exchangeable clay, smectite (SWN), a spectral change attributed to NK3175 was generated upon the irradiation of UV light. This result might serve as useful information on the methodology to produce optically controlled function for photoresponsive systems. Furthermore, the hybrid film of SWN and NK3175 was characterized by the use of XRD and FT-IR measurements. NK3175 molecules adsorbed onto external surfaces of SWN were confined by oriented SWN. It was suggested that the enhanced intermolecular interaction between NK3175 molecules caused by the hybridization with SWN resulted in the change of the aggregation state of NK3175 upon the UV light irradiation, which accounts for the spectral change of NK3175.
Highlights
IntroductionHow to cite this paper: Ishihara, M., Hirase, R. and Yoshioka, H. (2014) Unusual Spectral Change Due to a Cyanine Dye Adsorbed on an Inorganic Layered Material upon Photoirradiation
Organic dyes have attracted much attention from both viewpoints of fundamental science and practical applica-How to cite this paper: Ishihara, M., Hirase, R. and Yoshioka, H. (2014) Unusual Spectral Change Due to a Cyanine Dye Adsorbed on an Inorganic Layered Material upon Photoirradiation
Inorganic layered materials such as clay minerals are widely utilized as host materials for functional organic-inorganic hybrid systems due to their characteristic properties of intercalation and adsorption of organic guest species [1]-[6]
Summary
How to cite this paper: Ishihara, M., Hirase, R. and Yoshioka, H. (2014) Unusual Spectral Change Due to a Cyanine Dye Adsorbed on an Inorganic Layered Material upon Photoirradiation. Change of physical properties such as optical reflectance, refractivity, and fluorescence caused by photoirradiation for photo-functional organic dyes has been utilized for various optical devices Inorganic layered materials such as clay minerals are widely utilized as host materials for functional organic-inorganic hybrid systems due to their characteristic properties of intercalation and adsorption of organic guest species [1]-[6]. We proposed to monitor the absorption in the UV-visible region as a non-destructive readout method for a cooperative photoresponsive system and performed the photoinduced spectral change due to a cyanine dye by the use of a simple preparation method [30]. This study is expected to give new information on the methodology to introduce optically controlled function for photoresponsive systems
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