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RESEARCH ARTICLE
Contents Vol 73(6)

Structure and Stereochemistry of Adducts of Tris(dipivaloylmethanato)europium(iii), Eu(dpm)3, with Some Dipolar Aprotic Unidentate O-Donors

Eric J. Chan A , Jack M. Harrowfield A B D , Brian W. Skelton A , Alexandre N. Sobolev A and Allan H. White A C
+ Author Affiliations
- Author Affiliations

A School of Molecular Sciences, The University of Western Australia, M310, 35 Stirling Highway, Perth, WA 6009, Australia.

B Current address: Institut de Science et d’Ingenierie Supramoléculaires, Université de Strasbourg, 8, allée Gaspard Monge, 67083 Strasbourg, France.

C Deceased.

D Corresponding author. Email: harrowfield@unistra.fr

Australian Journal of Chemistry 73(6) 455-461 https://doi.org/10.1071/CH19135
Submitted: 24 March 2019  Accepted: 6 June 2019   Published: 18 July 2019

Abstract

Single crystal X-ray structural characterisations are reported for adducts of the form [(L-O)Eu(O,O′-dpm)3] obtained by the crystallisation of tris(dipivaloylmethanato)europium(iii) (dpm = [HC(C(tBu).CO)2]−) from an array of dipolar aprotic oxygen-donor solvents L (L = N-methylpyrrolidinone (nmp), trimethylphosphate, (MeO)3PO, (tmp), hexamethylphosphoramide (hmpa), dimethylacetamide (dma), dimethyl sulfoxide (dmso), and the bidentate octamethylpyrophosphoramide (ompa). In all adducts, the resulting arrays contain seven-coordinate metal atoms, which adopt two different isomeric forms of the mono-capped trigonal prismatic stereochemistry, the L = dma and dmso adducts corresponding to one type, nmp and tmp the other. The adduct formed with ompa behaves as a pair of discrete metal environments bridged by the O-ompa-O′ ligand, thus; [(dpm-O,O′)3Eu(O-ompa-O′)Eu(O,O′-dpm)3], and is found in two forms, one in which both Eu environments is of the tmp type, the other of the dmso/dma type. In the hmpa adduct, the asymmetric unit of the structure is a disordered composite of both types. In none of the adducts is there any further solvation beyond coordination of a single L.


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