Universität zu Köln

Gramm, Verena K., Smets, Daniel, Grzesiak, Ireneus, Block, Theresa, Poettgen, Rainer, Suta, Markus ORCID: 0000-0001-8024-6665, Wickleder, Claudia, Lorenz, Thomas ORCID: 0000-0003-4832-5157 and Ruschewitz, Uwe ORCID: 0000-0002-6511-6894 (2020). Eu(O2C-C equivalent to C-CO2): An Eu-II Containing Anhydrous Coordination Polymer with High Stability and Negative Thermal Expansion. Chem.-Eur. J., 26 (12). S. 2726 - 2735. WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1521-3765

Full text not available from this repository.

Abstract

Anhydrous Eu-II-acetylenedicarboxylate (EuADC; ADC(2-) = -O2C-C equivalent to C-CO2-) was synthesized by reaction of EuBr2 with K(2)ADC or H(2)ADC in degassed water under oxygen-free conditions. EuADC crystallizes in the SrADC type structure (I4(1)/amd, Z=4) forming a 3D coordination polymer with a diamond-like arrangement of Eu2+ nodes (msw topology including the connecting ADC(2-) linkers). Deep orange coloured EuADC is stable in air and starts decomposing upon heating in an argon atmosphere only at 440 degrees C. Measurements of the magnetic susceptibilities (mu(eff)=7.76 mu(B)) and Eu-151 Mossbauer spectra (delta=-13.25 mm s(-1) at 78 K) confirm the existence of Eu2+ cations. Diffuse reflectance spectra indicate a direct optical band gap of E-g=2.64 eV (470 nm), which is in accordance with the orange colour of the material. Surprisingly, EuADC does not show any photoluminescence under irradiation with UV light of different wavelengths. Similar to SrADC, EuADC exhibits a negative thermal volume expansion below room temperature with a volume expansion coefficient alpha(V)=-9.4(12)x10(-6) K-1.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gramm, Verena K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smets, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Grzesiak, Ireneus UNSPECIFIED UNSPECIFIED UNSPECIFIED Block, Theresa UNSPECIFIED UNSPECIFIED UNSPECIFIED Poettgen, Rainer UNSPECIFIED UNSPECIFIED UNSPECIFIED Suta, Markus UNSPECIFIED orcid.org/0000-0001-8024-6665 UNSPECIFIED Wickleder, Claudia UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, Thomas UNSPECIFIED orcid.org/0000-0003-4832-5157 UNSPECIFIED Ruschewitz, Uwe UNSPECIFIED orcid.org/0000-0002-6511-6894 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-345057
DOI:	10.1002/chem.201904966
Journal or Publication Title:	Chem.-Eur. J.
Volume:	26
Number:	12
Page Range:	S. 2726 - 2735
Date:	2020
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 ELECTRONIC-STRUCTURE; OPTICAL-PROPERTIES; CRYSTAL-STRUCTURES; DIVALENT; ACETYLENEDICARBOXYLATE; LUMINESCENCE; EUROPIUM; YELLOW; BLUE; MOFS Multiple languages Chemistry, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/34505