Functionalised beta-diketonate polynuclear lanthanoid hydroxo clusters: Synthesis, characterisation, and magnetic properties
MetadataShow full item record
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.
The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/218/description#description. Copyright © 2009 Elsevier B.V. All rights reserved
Showing items related by title, author, creator and subject.
Ge<inf>1-x</inf> Mn<inf>x</inf> Clusters: Central structural and magnetic building blocks of nanoscale wire-like self-assembly in a magnetic semiconductorBougeard, D.; Sircar, N.; Ahlers, S.; Lang, V.; Abstreiten, G.; Trampert, A.; Lebeau, J.; Stemmer, S.; Saxey, David; Cerezo, A. (2009)Controlled nanoscale self-assembly of magnetic entities in semiconductors opens novel perspectives for the tailoring of magnetic semiconductor films and nanostructures with room temperature functionality. We report that ...
Doxorubicin-Conjugated Mesoporous Magnetic Colloidal Nanocrystal Clusters Stabilized by Polysaccharide as a Smart Anticancer Drug VehicleLi, D.; Tang, J.; Chuan, W.; Guo, J.; Wang, S.; Chaudhary, Deeptangshu; Wang, C. (2012)Fabrication of magnetic nanocarriers that demonstrate enhanced biocompatibility and excellent colloidal stability is critical for the application of magnetic-motored drug delivery, and it remains a challenge. Herein, a ...
Can pathoanatomical pathways of degeneration in lumbar motion segments be identified by clustering MRI findingsJensen, R.; Jensen, T.; Kjaer, P.; Kent, Peter (2013)Background: Magnetic Resonance Imaging (MRI) is the gold standard for detailed visualisation of spinal pathological and degenerative processes, but the prevailing view is that such imaging findings have little or no ...