Functionalised beta-diketonate polynuclear lanthanoid hydroxo clusters: synthesis, characterisation, and magnetic properties

Andrews, Philip C., Beck, Tobias, Fraser, Benjamin H., Junk, Peter C., Massi, Massimiliano, Moubaraki, Boujemaa, Murray, Keith S., and Silberstein, Morry (2009) Functionalised beta-diketonate polynuclear lanthanoid hydroxo clusters: synthesis, characterisation, and magnetic properties. Polyhedron, 28 (11). pp. 2123-2130.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website: http://dx.doi.org/10.1016/j.poly.2009.03...
 
43
1


Abstract

The controlled hydrolysis of lanthanoid trichloride hexahydrate (Ln = Nd, Eu, Ho) in methanol with the beta-diketone ligands dibenzoylmethane and 1,3-bis(4-ethoxyphenyl)propane-1,3-dione yielded tetranuclear and pentanuclear hydroxo clusters for Eu and Ho. In contrast, performing the reaction in the presence of 1,3-bis(4-methoxyphenyl)propane-1,3-dione yielded a mononuclear complex for Nd. The compounds were structurally characterised by means of single crystal X-ray diffraction, showing that the increased bulkiness of the ligand due to the ethoxy functionalities does not affect the capability of the diketonate to stabilize the cluster core. Variable temperature dc susceptibility magnetic measurements were made on the Clusters and were indicative of very weak to zero antiferromagnetic, intra-cluster Coupling. Variable frequency ac data recorded at low temperatures did not show any evidence for single molecule magnet (SMM) behaviour. unlike the recent reported case of the analogue [Dy-5(OH)(5)(Ph(2)acac)(10)], where Ph(2)acac(-) is the dibenzoylmethanide ligand.

Item ID: 29702
Item Type: Article (Research - C1)
ISSN: 1873-3719
Keywords: lanthanoids, beta-diketones, crystal structures, magnetic susceptibility, metal-hydroxo clusters
Funders: Australian Research Council (ARC), Bayer Schering Pharma, Monash University
Date Deposited: 02 Oct 2013 10:34
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030202 f-Block Chemistry @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
Downloads: Total: 1
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page