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Type: Artigo de periódico
Title: Slow magnetic relaxation in (CoCuII)-Cu-II coordination oligomer built into mesoporous material
Author: Cangussu, D
Nunes, WC
Pereira, CLM
Pedroso, EF
Mazali, IO
Knobel, M
Alves, OL
Stumpf, HO
Abstract: The ferrimagnetic system CoCu(opba) [opba = ortho-phenylenebis(oxamato)] was employed to prepare a traditional chain [CoCu(opba)]center dot 4H(2)O (1) and a nanocomposite by incorporation in porous Vycor glass (PVG). This nanocomposite was made by first anchoring [BU4N](2)[Cu(opba)] on PVG [PVG-Cu (2)] and then treating it "in situ" with cobalt(II) acetate to obtain the nanomagnet PVG-CuCo (3). Magnetic measurements show that 1 consists of a one-dimensional ferrimagnet with strong intrachain antiferromagnetic coupling and weak interchain interactions that result in spin-glass behavior below 3.5 K. Nanocomposite 3 presents ferrimagnetic chains limited by the nanopore size, which leads to a slow relaxation of the magnetization following Arrhenius' law, frequency dependence for in-phase and out-of-phase susceptibility, and hysteresis below the blocked regime temperature (< 6 K). These features are characteristics of single-chain magnets (SCM). ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008).
Subject: cobalt
magnetic properties
mesoporous materials
molecule-based magnets
Country: Alemanha
Editor: Wiley-v C H Verlag Gmbh
Citation: European Journal Of Inorganic Chemistry. Wiley-v C H Verlag Gmbh, n. 24, n. 3802, n. 3808, 2008.
Rights: fechado
Identifier DOI: 10.1002/ejic.200800330
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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