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Armenis AS, Vipanchi V, Pantelis KN, Cunha-Silva L, Vignesh KR, Alexandropoulos DI, Stamatatos TC. Slow Magnetization Relaxation in a Family of Triangular {Co III 2 Ln III } Clusters: The Effect of Diamagnetic Co III Ions on the Ln III Magnetic Dynamics. Chemistry 2023; 29:e202302337. [PMID: 37638486 DOI: 10.1002/chem.202302337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 08/25/2023] [Accepted: 08/28/2023] [Indexed: 08/29/2023]
Abstract
The first use of the Schiff base chelate N-naphthalidene-o-aminophenol (naphH2 ) in Co/Ln chemistry has afforded a family of isostructural [CoIII 2 LnIII (OMe)2 (naph)2 (O2 CMe)3 (MeOH)2 ] (Ln=Tb, Dy and Er) complexes, revealing a rare {CoIII 2 Ln(μ3 -OMe)}8+ triangular core composed of two diamagnetic CoIII ions and a 4f-ion with slightly distorted square antiprismatic geometry. Alternating current (ac) magnetic susceptibility studies revealed that {Co2 Dy}, and its magnetic diluted analogue {Co2 Dy0.05 Y0.95 }, behave as mononuclear single-molecule magnets (SMMs) with similar energy barriers for the magnetization reversal, Ueff , of ~85-90 K. SMM properties were also detected for {Co2 Er}, with the compound exhibiting a Ueff of 18.7 K under an applied magnetic field of 800 Oe. To interpret the experimental magnetic results, ab initio CASSCF/RASSI-SO and DFT calculations were performed as a means of exploring the single-ion characteristics of LnIII ions and comprehend the role of the diamagnetic CoIII ions in the magnetization relaxation of the three heterometallic compounds.
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Affiliation(s)
| | - Vikram Vipanchi
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali Sector-81, Knowledge city, S.A.S. Nagar, Mohali, 140306, Punjab, India
| | | | - Luís Cunha-Silva
- LAQV/REQUIMTE & Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007, Porto, Portugal
| | - Kuduva R Vignesh
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali Sector-81, Knowledge city, S.A.S. Nagar, Mohali, 140306, Punjab, India
| | | | - Theocharis C Stamatatos
- Department of Chemistry, University of Patras, 265 04, Patras, Greece
- Institute of Chemical Engineering Sciences, Foundation for Research and Technology - Hellas (FORTH/ICE - HT) Platani, P.O. Box 1414, 26504, Patras, Greece
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