Slow magnetic relaxation in mononuclear complexes of Tb, Dy, Ho and Er with the pentadentate (N3O2) Schiff-base dapsc ligand. (14th August 2018)

• Record Type: Journal Article
• Authors: Sasnovskaya, Valentina D.; Kopotkov, Vyacheslav A.; Kazakova, Anna V.; Talantsev, Artem D.; Morgunov, Roman B.; Simonov, Sergey V.; Zorina, Leokadiya V.; Mironov, Vladimir S.; Yagubskii, Eduard B.
• Is Part Of: New journal of chemistry. Volume 42:Number 18(2018)
• Page Start: 14883
• Page End: 14893
• Publication Date: 2018-08-14
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj01928b
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : AC measurements revealed field-induced single-ion magnet behavior of Dy and Er Kramers ion complexes. The properties of complexes were rationalized by superposition CF model. Abstract : Isostructural mononuclear complexes of heavy lanthanides with the pentadentate Schiff-base dapsc ligand were synthesized, [Ln(H2 dapsc)(H2 O)4 ](NO3 )3 (Ln = Tb, Dy, Ho, Er), and characterized structurally and magnetically. AC magnetic susceptibility measurements revealed that complexes of Dy 3+ and Er 3+ Kramers ions are field-induced single-ion magnets whereas the Tb and Ho complexes show no slow magnetic relation in DC fields up to 6000 Oe. DC and AC magnetic properties of these complexes were rationalized in terms of superposition crystal-field model calculations for Ln 3+ ions, which have resulted in good agreement between the experiment and the theory. It is shown that low single-molecule magnet characteristics of the Dy and Er complexes and the absence of slow-magnetic relaxation in the Tb and Ho complexes are primarily due to the low-symmetry coordination of Ln 3+ ions.