Heptanuclear heterometallic [Cu6Ln] clusters: trapping lanthanides into copper cages with artificial amino acids

Sopasis, G. J., Canaj, A. B. , Philippidis, A., Siczek, M., Lis, T., O’Brien, J. R., Antonakis, M. M., Pergantis, S. A. and Milios, C. J. (2012) Heptanuclear heterometallic [Cu6Ln] clusters: trapping lanthanides into copper cages with artificial amino acids. Inorganic Chemistry, 51(10), pp. 5911-5918. (doi: 10.1021/ic300538q) (PMID:22548650)

Abstract

Employment of the artificial amino acid 2-amino-isobutyric acid, aibH, in CuII and CuII/LnIII chemistry led to the isolation and characterization of 12 new heterometallic heptanuclear [Cu6Ln(aib)6(OH)3(OAc)3(NO3)3] complexes consisting of trivalent lanthanide centers within a hexanuclear copper trigonal prism (aibH = 2-amino-butyric acid; Ln = Ce (1), Pr (2), Nd (3), Sm (4), Eu (5), Gd (6), Tb (7), Dy (8), Ho (9), Er (10), Tm (11), and Yb (12)). Direct curent magnetic susceptibility studies have been carried out in the 5–300 K range for all complexes, revealing the different nature of the magnetic interactions between the 3d–4f metallic pairs: dominant antiferromagnetic interactions for the majority of the pairs and dominant ferromagnetic interactions for when the lanthanide center is GdIII and DyIII. Furthermore, alternating current magnetic susceptibility studies reveal the possibility of single-molecule magnetism behavior for complexes 7 and 8. Finally, complexes 2, 5–8, 10, and 12 were analyzed using positive ion electrospray mass spectrometry (ES-MS), establishing the structural integrity of the heterometallic heptanuclear cage structure in acetonitrile.

• Item Type: Articles
• Additional Information: C.J.M. thanks The University of Crete (ELKE, Research Grant KA 3089) for funding.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Tsanai, Dr Angelos
• Authors: Sopasis, G. J., Canaj, A. B., Philippidis, A., Siczek, M., Lis, T., O’Brien, J. R., Antonakis, M. M., Pergantis, S. A., and Milios, C. J.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Inorganic Chemistry
• Publisher: American Chemical Society
• ISSN: 0020-1669
• ISSN (Online): 1520-510X
• Published Online: 01 May 2012