Universität zu Köln

Hermann, Daniela, Schwartz, Heidi A., Werker, Melanie, Schaniel, Dominik and Ruschewitz, Uwe ORCID: 0000-0002-6511-6894 (2019). Metal-Organic Frameworks as Hosts for Fluorinated Azobenzenes: A Path towards Quantitative Photoswitching with Visible Light. Chem.-Eur. J., 25 (14). S. 3606 - 3617. WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1521-3765

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Abstract

Fifteen new photochromic hybrid materials were synthesized by gas phase loading of fluorinated azobenzenes, namely ortho-tetrafluoroazobenzene (tF-AZB), 4H,4H '-octafluoroazobenzene (oF-AZB), and perfluoroazobenzene (pF-AZB), into the pores of the well-known metal-organic frameworks MOF-5, MIL-53(Al), MIL-53(Ga), MIL-68(Ga), and MIL-68(In). Their composition was analysed by elemental (CHNS) and DSC/TGA. For pF-AZB(0.34)@MIL-53(Al), a structural model based on high-resolution synchrotron powder diffraction data was developed and the host-guest and guest-guest interactions were elucidated from this model. These interactions of O-H ... F and pi ... pi type were confirmed by significant shifts of the O-H frequencies in loaded and unloaded MOFs of the MIL-53 and MIL-68 series. Most remarkably, all of the synthesized F-AZB@MOF systems can be switched with visible light, and some of them show almost quantitative (>95 %) photo-isomerization between its E and Z forms with no significant fatigue after repeated switching cycles.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hermann, Daniela UNSPECIFIED UNSPECIFIED UNSPECIFIED Schwartz, Heidi A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Werker, Melanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Schaniel, Dominik UNSPECIFIED UNSPECIFIED UNSPECIFIED Ruschewitz, Uwe UNSPECIFIED orcid.org/0000-0002-6511-6894 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-154138
DOI:	10.1002/chem.201805391
Journal or Publication Title:	Chem.-Eur. J.
Volume:	25
Number:	14
Page Range:	S. 3606 - 3617
Date:	2019
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1521-3765
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language REVERSIBLE FLUORESCENCE MODULATION; CRYSTAL-STRUCTURES; THIN-FILMS; ISOMERIZATION; ADSORPTION; SWITCHES; PHOTOISOMERIZATION; FLUOROAZOBENZENES; NANOCOMPOSITES; PHOTOCHROMISM Multiple languages Chemistry, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15413