Study of Anisotropic Photoluminescence and Energy Transfer in Oriented Dye-incorporating Zeolite-L Monolayer

Lee, Jin Seok

doi:10.5012/bkcs.2010.31.8.2190

Cited by 4 publications

(1 citation statement)

References 21 publications

(25 reference statements)

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“…The structure of methylviologen–ZL has been studied by means of powder X-ray and vibrational spectroscopy . Most studies, however, rely on powerful optical microscopy investigations of single crystals in the size range of half a micrometer up to several micrometers. ,,,− These methods are related to the orientation of the ETDM of the first allowed electronic transition of the molecules. This molecular property is usually well-known as it can be measured by several methods and often also accurately calculated with moderate computational effort.…”

Section: Introductionmentioning

confidence: 99%

Orientation and Order of Xanthene Dyes in the One-Dimensional Channels of Zeolite L: Bridging the Gap between Experimental Data and Molecular Behavior

2012

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Supramolecular organization in nanochannels is governed by both the nature of the channels and the size, shape, and charge of the guests, and may also depend on the cosolvent in the host. Oxonine (Ox+) and pyronine (Py+) cationic dyes in zeolite L (ZL) could provide important insight on this issue, but their orientation in the composite materials is not understood yet. Theoretical modeling of Ox+/ZL and Py+/ZL composites indicates that the 70–80° orientation, deduced from optical microscopy data but incompatible with host–guest geometry contraints, is not stable and reveals two possible orientations for these dyes in ZL nanochannels: perpendicular or parallel to the channel axis. In the hydrated composite, corresponding to optical microscopy experiments conditions, perpendicular Ox+/Py+ is the favored orientation, suggesting a larger portion of perpendicularly oriented dye molecules and a smaller fraction aligned. Optical microscopy data might therefore be reinterpreted as the vector sum of components arising from a population of molecules with nonuniform orientation. The stability order is reversed at dry conditions, indicating that the organization of xanthene dyes in ZL channels is governed by water. Our study explains this cosolvent-driven supramolecular organization regime, here unraveled for the first time, and highlights the role of molecular flexibility in switching the dye orientation

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Section: Introductionmentioning

confidence: 99%

Orientation and Order of Xanthene Dyes in the One-Dimensional Channels of Zeolite L: Bridging the Gap between Experimental Data and Molecular Behavior

2012

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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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Insights into the interplay between electric fields and microstructures of AEL films under ionothermal conditions

Liu

Chu

et al. 2017

Chem. Commun.

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A facile method for precise microstructure control of molecular sieve films remains a great challenge. In contrast to conventional hydrothermal methods, herein AEL molecular sieve films with preferred c-orientation are in situ fabricated through elaborate programming of the applied electric fields under ionothermal conditions. The approach developed here may pave a new avenue for designing and fabricating high quality molecular sieve films with diverse microstructures and functionality.

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Study of Anisotropic Photoluminescence and Energy Transfer in Oriented Dye-incorporating Zeolite-L Monolayer

Cited by 4 publications

References 21 publications

Orientation and Order of Xanthene Dyes in the One-Dimensional Channels of Zeolite L: Bridging the Gap between Experimental Data and Molecular Behavior

Orientation and Order of Xanthene Dyes in the One-Dimensional Channels of Zeolite L: Bridging the Gap between Experimental Data and Molecular Behavior

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

Insights into the interplay between electric fields and microstructures of AEL films under ionothermal conditions

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