Energy Collection, Transport, and Trapping by a Supramolecular Organization of Dyes in Hexagonal Zeolite Nanocrystals

Minkowski, Claudia; Pansu, Robert; Takano, Minako; Calzaferri, Gion

doi:10.1002/adfm.200500284

Cited by 43 publications

(28 citation statements)

References 55 publications

(49 reference statements)

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“…[39] The first time and space resolved luminescence study has been reported on DMPOPOP,Ox + -ZL crystals of about 2.6 mm length. [66,83] It has been observed that the vibrational structure in the excitation and the fluorescence spectra of Ox + inside of the ZL channels is better visible than in solution, if the loading is not too high so that optical saturation is avoided. Similar observations have been made for thionine (Th + ) [104] and other cationic dyes inserted into ZL.…”

Section: Ox + -Zlmentioning

confidence: 98%

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Designing Dye–Nanochannel Antenna Hybrid Materials for Light Harvesting, Transport and Trapping

et al. 2011

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We discuss artificial photonic antenna systems that are built by incorporating chromophores into one-dimensional nanochannel materials and by organizing the latter in specific ways. Zeolite L (ZL) is an excellent host for the supramolecular organization of different kinds of molecules and complexes. The range of possibilities for filling its one-dimensional channels with suitable guests has been shown to be much larger than one might expect. Geometrical constraints imposed by the host structure lead to supramolecular organization of the guests in the channels. The arrangement of dyes inside the ZL channels is what we call the first stage of organization. It allows light harvesting within the volume of a dye-loaded ZL crystal and also the radiationless transport of energy to either the channel ends or center. One-dimensional FRET transport can be realized in these guest-host materials. The second stage of organization is realized by coupling either an external acceptor or donor stopcock fluorophore at the ends of the ZL channels, which can then trap or inject electronic excitation energy. The third stage of organization is obtained by interfacing the material to an external device via a stopcock intermediate. A possibility to achieve higher levels of organization is by controlled assembly of the host into ordered structures and preparation of monodirectional materials. The usually strong light scattering of ZL can be suppressed by refractive-index matching and avoidance of microphase separation in hybrid polymer/dye-ZL materials. The concepts are illustrated and discussed in detail on a bidirectional dye antenna system. Experimental results of two materials with a donor-to-acceptor ratio of 33:1 and 52:1, respectively, and a three-dye system illustrate the validity and challenges of this approach for synthesizing dye-nanochannel hybrid materials for light harvesting, transport, and trapping.

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Section: Ox + -Zlmentioning

confidence: 98%

“…[35, 61,63,66,76,[82][83][84][85][86][87][88][89] Measuring good-quality absorption and fluorescence spectra is important. Measurements on a lightscattering material are often not satisfactory.…”

Section: A Simple Antenna Systemmentioning

confidence: 99%

Designing Dye–Nanochannel Antenna Hybrid Materials for Light Harvesting, Transport and Trapping

et al. 2011

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“…[25] Other structured, pore containing materials including mesostructured titania and zirconia, and microporous zeolites have received considerable attention as well. [30][31][32][33][34] Meso-and macrostructured titania have been synthesized, and post synthesis treatment used to induce wall crystallinity without cracking. [30] Mesoporous titania and zirconia, with cubic or 2D hexagonal structure, has been synthesized and further derivatized using post grafting.…”

Section: Introductionmentioning

confidence: 99%

Mesostructured Silica Supports for Functional Materials and Molecular Machines

Angelos

Johansson

Stoddart

et al. 2007

Adv Funct Materials

187

148

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Mesostructured silica thin films and particles prepared by surfactant‐templated sol–gel techniques are highly versatile substrates for the formation of functional materials. The ability to deliberately place molecules possessing desired activities in specific spatially separated regions of the nanostructure is an important feature of these materials. Such placement utilizes strategies that exploit the physical and chemical differences between the silica framework and the templated pores. As an example of placement of pairs of molecules, donor and acceptor molecules can be targeted to different regions of mesostructured thin films and energy transfer between them can be measured. The results not only demonstrate the spatial separation but also are used as a molecular ruler to measure the average distance between them. Mesostructured silica is also an excellent support for molecular machines. Molecules that undergo large amplitude motion, when attached to the silica, can function as impellers and nanovalves when activated by light, electrical (redox) and chemical (pH, competitive binding) energy. Derivatized azobenzene molecules, attached to pore walls by using one of the placement strategies, function as impellers that can move other molecules through the pores. Rotaxanes and pseudorotaxanes, placed at pore entrances, function as gatekeepers that can trap and release molecules from the pores when stimulated. Deliberately placed functional molecules on and in mesostructured silica offer many possibilities for both fundamental studies on the nanoscale and for applications in fields as diverse as fluidics, biological drug delivery and controlled release.

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“…[1][2][3][4][5][6][7] In particular, zeolite L, which possesses unidirectional channels, has been shown to be a suitable material for supramolecular organization of different kinds of molecules. [8][9][10] The size (30 nm to several micrometers) and aspect ratio of L-type zeolite can be controlled synthetically. [11] Furthermore, it has been shown recently that they can be organized in monolayers on a silica substrate by chemical functionalization.…”

mentioning

confidence: 99%