Universität zu Köln

Schwartz, Heidi A., Olthof, Selina ORCID: 0000-0002-8871-1549, Schaniel, Dominik ORCID: 0000-0003-2440-9540, Meerholz, Klaus and Ruschewitz, Uwe ORCID: 0000-0002-6511-6894 (2017). Solution-Like Behavior of Photoswitchable Spiropyrans Embedded in Metal-Organic Frameworks. Inorg. Chem., 56 (21). S. 13100 - 13111. WASHINGTON: AMER CHEMICAL SOC. ISSN 1520-510X

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Abstract

1,3,3-Trimethylindolino-6'-nitrobenzopyrylospiran (SP-1) as an example of a photoswitchable spiropyran was loaded into the pores of different prototypical metal-organic frameworks, namely MOF-5, MIL-68(In), and MIL-68(Ga), by a vapor-phase process. The successful incorporation in the pores of the MOF was proven by X-ray powder diffraction, and the amount of the embedded photoswitchable guest was determined by X-ray photoelectron spectroscopy and elemental analysis. In contrast to the sterically hindered crystalline state, SP-1 embedded in solid MOF hosts shows photoswitching under irradiation with UV light from the spiropyran to its merocyanine form with a nearly complete photoisomerization. Switching can be reversed by heat treatment. These switching properties were confirmed by means of UV/vis and IR spectroscopy. Remarkably, the embedded guest molecules show photo switching and absorption properties similar to those in the dissolved state, so that MOFs might be considered as solid solvents for photoswitchable spiropyrans. In contrast to that, embedment of SP-1 in the smaller pores of MIL-53(Al) was not successful. SP-1 is mainly adsorbed on the surfaces of the MIL-53(Al) particles, which also leads to photoswitching properties.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schwartz, Heidi A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Olthof, Selina UNSPECIFIED orcid.org/0000-0002-8871-1549 UNSPECIFIED Schaniel, Dominik UNSPECIFIED orcid.org/0000-0003-2440-9540 UNSPECIFIED Meerholz, Klaus UNSPECIFIED UNSPECIFIED UNSPECIFIED Ruschewitz, Uwe UNSPECIFIED orcid.org/0000-0002-6511-6894 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-211485
DOI:	10.1021/acs.inorgchem.7b01908
Journal or Publication Title:	Inorg. Chem.
Volume:	56
Number:	21
Page Range:	S. 13100 - 13111
Date:	2017
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1520-510X
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 ALUMINUM TEREPHTHALATE MIL-53; REVERSE PHOTOCHROMISM; DERIVATIVES BEARING; POROUS SILICON; DRUG-DELIVERY; ADSORPTION; SPIROBENZOPYRANS; COORDINATION; FILMS; ISOMERIZATION Multiple languages Chemistry, Inorganic & Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21148