Universität zu Köln

Deacon, Glen B., Forsyth, Craig M., Gazukin, Olga, Junk, Peter C., Meyer, Gerd, Sierau, Jennyfer and Turner, David R. (2014). An Unexpected Coupling Reaction of 8-Quinolinolate at Elevated Temperature. Aust. J. Chem., 67 (8-9). S. 1251 - 1257. CLAYTON: CSIRO PUBLISHING. ISSN 1445-0038

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Abstract

Reactions of 8-hydroxyquinoline (HOQ) with elemental rare-earth and transition metal combinations or alloys at 200-300 degrees C yielded a variety of complexes, albeit in very low yields, including two structurally characterised homometallic complexes containing an unexpected biquinolinolate ligand. Reaction of HOQ with SmCo5 alloy gives rise to the complexes [SmCo2(OQ)(7)] (1), [Co-4(OQ)(4)(BQ)(2)] (2), and [Sm-3(OQ)(5)(BQ)(2)(H2O)] (3Sm), where BQ is 2,7-biquinoline-8,8-diolate, resulting from an unusual coupling reaction between two OQ/HOQ species at the 2 and 7 positions. Complexes 1-3 and HOQ co-crystal 2 center dot 2HOQ were isolated as single crystals from separate reactions although formation of other products under the reaction conditions used was likely. Analogues of 3Sm with erbium and ytterbium were obtained using respective rare-earth metal filing in combination with nickel powder. Reaction involving cobalt powder only, without any rare-earth metals, yielded a homoleptic complex containing only the 8-quinolinolate ligand i.e. [Co-4(OQ)(8)] (4). These results highlight the rewards, in terms of rich synthetic chemistry, and pitfalls, in terms of yield and isolation, of the pseudo-solid state synthetic approach using 8-quinolinolate ligands.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Deacon, Glen B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Forsyth, Craig M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gazukin, Olga UNSPECIFIED UNSPECIFIED UNSPECIFIED Junk, Peter C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Meyer, Gerd UNSPECIFIED UNSPECIFIED UNSPECIFIED Sierau, Jennyfer UNSPECIFIED UNSPECIFIED UNSPECIFIED Turner, David R. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-449635
DOI:	10.1071/CH14191
Journal or Publication Title:	Aust. J. Chem.
Volume:	67
Number:	8-9
Page Range:	S. 1251 - 1257
Date:	2014
Publisher:	CSIRO PUBLISHING
Place of Publication:	CLAYTON
ISSN:	1445-0038
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RARE-EARTH; COMPLEXES; OXIDATION; CRYSTAL; METAL Multiple languages Chemistry, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44963