Universität zu Köln

Baecker, Joanna, Mihm, Svenja, Mallick, Bert, Yang, Mei, Meyer, Gerd ORCID: 0000-0003-1000-9001 and Mudring, Anja-Verena (2011). Crystalline and Liquid Crystalline Organic-Inorganic Hybrid Salts with Cation-Sensitized Hexanuclear Molybdenum Cluster Complex Anion Luminescence. Eur. J. Inorg. Chem. (26). S. 4089 - 4096. WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1434-1948

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Abstract

The salts [C(n)mim](2)[Mo6Cl14] (mim = methylimidazolium; n = 4, 6, 12, 16, 18) have been obtained by reaction of C(n)mimCl with MoCl2. Thermal analysis shows the melting point decreases with increasing alkyl chain length of the cation. The imidazolium chloromolybdates(II) with n = 6-18 decompose above 340 degrees C; [C(18)mim](2)[Mo6Cl14] is thermally stable up to 390 degrees C. All compounds are insensititve to the constituents of the atmosphere. Of the higher melting salts [C(n)mim](2)[Mo6Cl14] (n = 4, 6), high-quality single crystals could be obtained. Single-crystal X-ray structural analyses clearly show that the cluster complex anion [Mo6Cl14](2-) has an electron-precise octahedral {Mo-6} cluster. For [C(4)mim](2)[Mo6Cl14], two polymorphs differing in the cation alkyl-side-chain conformation were obtained. The less thermodynamically stable modification with a gauche conformation undergoes monotropic phase transition to the more stable form with the all-trans conformation. Long alkyl-side-chain salts, [C(n)mim](2)[Mo6Cl14] with n = 16 and 18, exhibit thermotropic liquid-crystalline behaviour. All compounds show bright red luminescence centred at about 730 nm with a lifetime of about 0.15 ms, originating from the cluster complex anion, which can be sensitized by the imidazolium cations.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Baecker, Joanna UNSPECIFIED UNSPECIFIED UNSPECIFIED Mihm, Svenja UNSPECIFIED UNSPECIFIED UNSPECIFIED Mallick, Bert UNSPECIFIED UNSPECIFIED UNSPECIFIED Yang, Mei UNSPECIFIED UNSPECIFIED UNSPECIFIED Meyer, Gerd UNSPECIFIED orcid.org/0000-0003-1000-9001 UNSPECIFIED Mudring, Anja-Verena UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-489529
DOI:	10.1002/ejic.201100365
Journal or Publication Title:	Eur. J. Inorg. Chem.
Number:	26
Page Range:	S. 4089 - 4096
Date:	2011
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1434-1948
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language IONIC LIQUIDS; EXPLORATORY SYNTHESIS; BROMIDE MONOHYDRATE; MOLECULAR-COMPOUNDS; SOLID-STATE; CHLORIDE; HALIDES Multiple languages Chemistry, Inorganic & Nuclear Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48952