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Indexed by:Journal Papers

Date of Publication:2015-12-01

Journal:EUROPEAN JOURNAL OF INORGANIC CHEMISTRY

Included Journals:SCIE、Scopus

Volume:2015

Issue:34

Page Number:5702-5707

ISSN No.:1434-1948

Key Words:Heterometallic complexes; Magnetic properties; Lanthanides; Chromium; Cluster compounds

Abstract:The syntheses, structures, and magnetic properties of two series of Cr-Ln heterometallic clusters based on the 2,2 '-bipyridine (bipy) ligand are reported; binuclear [LnCr(bipy)(2)(mu(2)-OH)(2)(H2O)(6)](ClO4)(4)center dot 2H(2)O {Ln = Gd (1Gd) or Dy (1Dy)} and trinuclear [LnCr(2)(bipy)(4)(mu(2)-OH)(4)(H2O)(4)](ClO4)(5)center dot H2O {Ln = Gd (2Gd), Dy (2Dy), or Tb (2Tb)}. Their syntheses could be controlled by the amount of lanthanide perchlorate used. The binuclear [CrLn] clusters could be formed with 24 equivalents of Ln(ClO4)(3), whereas 12 equivalents of Ln(ClO4)(3) gave the trinuclear [Cr(2)Ln] species with a CrLnCr core. The Cr3+ and Ln(3+) ions are bridged by mu(2)-OH groups in the two systems, and the [Cr(2)Ln] cluster is further assembled into a 1D supramolecular architecture by weak intermolecular pi-pi interactions. Magnetic analyses reveal that the Cr center dot center dot center dot Gd interactions in 1Gd and 2Gd are both antiferromagnetic.