Title: Surprising properties of a furo-furanone
Authors : Calzaferri, Gion
Brühwiler, Dominik
Meng, Tao
Dieu, Le-Quyenh
Malinovskii, Vladimir L.
Häner, Robert
Published in : Chemistry : a European Journal
Volume(Issue) : 16
Issue : 37
Pages : 11289
Pages to: 11299
Publisher / Ed. Institution : Wiley
Issue Date: 2010
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : ICBC; J-coupling; 2010; Zeolite
Subject (DDC) : 540: Chemistry
Abstract: The electronic absorption, fluorescence, and excitation spectra of furo[3,4-c]furanone (1) have been measured in different solvents at different concentrations. We observed a complex dependence of absorption and excitation spectra as a function of the concentration in CH2Cl2 and THF due to aggregate formation. Interestingly, the fluorescence spectra were not affected. Resolving the puzzle was made possible by the fact that 1 fits perfectly into the channels of zeolite L (ZL) microcrystals to form 1-ZL guest-host composites. The geometry of the ZL channel system ensures a well-defined orientation of the embedded dye molecules, thereby leading to a preferred orientation of their electronic transition dipole moment (ETDM) and thus to objects with pronounced optical anisotropy properties. This enabled us to understand that in solution the monomers that are present at low concentration form an aggregate in which the molecules sit on top of each other and arrange into a J-type aggregate configuration at higher concentrations. The signature of the latter is observed in the 1-ZL composites. This seems to be the first example in which the insertion of molecules into a nanochannel microcrystal has helped in understanding the weak intermolecular interactions that take place in solution.   
Departement: Life Sciences und Facility Management
Organisational Unit: Institute of Chemistry and Biotechnology (ICBT)
Publication type: Article in scientific Journal
DOI : 10.1002/chem.201000728
ISSN: 0947-6539
URI: https://digitalcollection.zhaw.ch/handle/11475/2661
Appears in Collections:Publikationen Life Sciences und Facility Management

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