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Bartolomé E, Arauzo A, Luzón J, Melnic S, Shova S, Prodius D, Nlebedim IC, Bartolomé F, Bartolomé J. High relaxation barrier in neodymium furoate-based field-induced SMMs. Dalton Trans 2019; 48:15386-15396. [PMID: 31257389 DOI: 10.1039/c9dt02047k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two new neodymium molecular magnets of formula {[Nd(α-fur)3(H2O)2]·DMF}n (1) and {[Nd0.065La0.935(α-fur)3(H2O)2]}n (2), α-fur = C4H3OCOO, have been synthesized. In (1) the furoate ligands, in bidentate bridging mode, consolidate zig-zag chains running along the a-direction. Compound (2) is a magnetically diluted complex of a polymeric chain along the b-axis. Heat capacity, dc magnetization and ac susceptibility measurements have been performed from 1.8 K up to room temperature. Ab initio calculations yielded the gyromagnetic factors gx* = 0.52, gy* = 1.03, gz* = 4.41 for (1) and gx* = 1.35, gy* = 1.98, gz* = 3.88 for (2), and predicted energy gaps of Δ/kB = 125.5 K (1) and Δ/kB = 58.8 K (2). Heat capacity and magnetometry measurements agree with these predictions, and confirm the non-negligible transversal anisotropy of the Kramers doublet ground state. A weak intrachain antiferromagnetic interaction J'/kB = -3.15 × 10-3 K was found for (1). No slow relaxation is observed at H = 0, attributed to the sizable transverse anisotropy component, and/or dipolar or exchange interactions enhancing the quantum tunnelling probability. Under an external applied field as small as 80 Oe, two slow relaxation processes appear: above 3 K the first relaxation mechanism is associated to a combination of Orbach process, with a sizeable activation energy U/kB = 121 K at 1.2 kOe for (1), Raman and direct processes; the second, slowest relaxation mechanism is associated to a direct process, affected by phonon-bottleneck effect. For complex (2) a smaller U/kB = 61 K at 1.2 kOe is found, together with larger g*-transversal terms, and the low-frequency process is quenched. The reported complexes represent rare polymeric Nd single-ion magnets exhibiting high activation energies among the scarce Nd(iii) family.
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Affiliation(s)
- E Bartolomé
- Escola Universitària Salesiana de Sarrià (EUSS), Passeig Sant Joan Bosco 74, 08017-Barcelona, Spain.
| | - A Arauzo
- Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain and Servicio de Medidas Físicas. Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - J Luzón
- Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain and Centro Universitario de la Defensa. Academia General Militar, Zaragoza, Spain
| | - S Melnic
- Institute of Chemistry, Academy of Sciences of Moldova, Academiei 3, MD-2028, Chisinau, Republic of Moldova
| | - S Shova
- "Petru Poni" Institute of Macromolecular Chemistry, Alea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - D Prodius
- Ames Laboratory, US Department of Energy and Critical Materials Institute, Ames, IA-50011-3020, USA
| | - I C Nlebedim
- Ames Laboratory, US Department of Energy and Critical Materials Institute, Ames, IA-50011-3020, USA
| | - F Bartolomé
- Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - J Bartolomé
- Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
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Koziol AE, Brzyska W, Klimek B, Krol A, Palenik GJ, Stepniak K. X-ray Structure Analysis of the Isomorphous Complexes Triaquatris(2-Furancarboxylato)-Yttrium(III) and Erbium(III). J COORD CHEM 2009. [DOI: 10.1080/00958978909408848] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Song Y, Yan B, Weng L. Four distinctive 1-D lanthanide carboxylate coordination polymers: Synthesis, crystal structures and spectral properties. Polyhedron 2007; 26:4591-601. [DOI: 10.1016/j.poly.2007.06.018] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Song YS, Yan B, Chen ZX. The first lanthanide carboxylate complex constructed from hydroxyl bridging bimetallic units: Hydrothermal synthesis, crystal structure and luminescent properties. Inorganica Chim Acta 2007. [DOI: 10.1016/j.ica.2007.03.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Fonda K, Smailes D, Vallarino L, Bombieri G, Benetollo F, Polo A, de Cola L. Interaction of neutral and anionic o-donor organic ligands with europium(III) in the macrocyclic complex [Eu(CH3COO)2(C22H26N6)]Cl · 4H2O and crystal structure of [Eu(CH3COO)2(C22H26N6)](CH3COO) · 9H2O. Polyhedron 1993. [DOI: 10.1016/s0277-5387(00)83408-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Alcock NW, Kemp TJ, Leciejewicz J. Mixed bidentate and bridging coordination by furoic acid in the X-ray structure of tris(furoato)bis(aquo)hydroxodioxouranium(VI) dihydrate. Inorganica Chim Acta 1991. [DOI: 10.1016/s0020-1693(00)85072-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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