Verknüpfung von Mikrokristallen durch kooperative koordinative Wechselwirkungen

Popović, Zoran D.; Huber, Stefan; Calzaferri, Gion; Cola, Luisa De

doi:10.1002/ange.200701948

Cited by 10 publications

(9 citation statements)

References 38 publications

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“…A versatile method for covalently attaching stopcock molecules to the channel entrances is by first grafting an amino group, which can then be treated with any amino-reactive molecule, as illustrated in Scheme 1. [13][14][15] A selection of stopcocks successfully used so far can be found in ref. [4].…”

Section: Organisationmentioning

confidence: 99%

Dye‐Modified Nanochannel Materials for Photoelectronic and Optical Devices

Calzaferri

Brühwiler

2008

Chemistry A European J

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Artificial photonic antenna systems have been realised by incorporating organic dyes into zeolite L. The size and aspect ratio of the cylindrically shaped zeolite crystals can be tuned over a wide range, adding to the versatility of this host material. A 600 nm sized crystal, for example, consists of about 96 000 one-dimensional channels oriented parallel to the cylinder axis. Geometrical constraints imposed by the host structure lead to supramolecular organisation of the guests, allowing high concentrations of non- or only very weakly interacting dye molecules. A special twist is added to these systems by plugging the channel openings with a second type of fluorescent dye, a so-called stopcock molecule. The two types of molecules are precisely tuned to each other; the stopcocks are able to accept excitation energy from the dyes in the channels, but cannot pass it back. The supramolecular organisation of dyes in the zeolite channels corresponds to a first stage of organisation, allowing light-harvesting within the volume of a cylindrical crystal and radiationless energy transport to either the cylinder ends or centre. The second stage of organisation represents the coupling to an external acceptor or donor stopcock fluorophore at the channel entrances, which can then trap or inject electronic excitation energy. The third stage of organisation is realised by interfacing the material to an external device through a stopcock intermediate. We observed that electronic-excitation-energy transfer in dye-zeolite L materials occurs mainly along the channel axis and we have shown that macroscopically organised materials can be prepared. The new materials offer unique possibilities as building blocks for optical, electro-optical and sensing devices.

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Section: Organisationmentioning

confidence: 99%

Dye‐Modified Nanochannel Materials for Photoelectronic and Optical Devices

Calzaferri

Brühwiler

2008

Chemistry A European J

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“…The resulting ordering was not efficient and resulted in chains of only two to three crystals of alternate colors, along with many unassembled single crystals. This finding can probably be attributed to the rough surfaces of the crystals, [12] which prevent an efficient chemical reaction between the terminal groups.…”

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confidence: 99%

Dynamic Microcrystal Assembly by Nitroxide Exchange Reactions

et al. 2010

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Sticking together: The pore entrances of dye‐loaded green or red zeolite L crystals can be site‐specifically modified with either alkoxyamines or nitroxide radicals. Mild radical nitroxide exchange reactions of alkoxyamine‐terminated “green” zeolite crystals with nitroxide‐terminated “red” crystals leads to highly regular crystal chains that contain up to 15 covalently connected crystals with strictly alternating colors.

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“…Dies führten wir auf Unebenheiten der Kristalloberflächen bei den verwendeten Zeolithen zurück. [12] Dadurch wird wahrscheinlich eine effiziente chemische Reaktion zwischen den terminalen Funktionen verhindert.…”

Section: Methodsunclassified