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Slow Magnetic Relaxation in Co II Cu II Coordination Oligomer Built into Mesoporous Material
Author(s) -
Cangussu Danielle,
Nunes Wallace C.,
Pereira Cynthia L. M.,
Pedroso Emerson F.,
Mazali Italo O.,
Knobel Marcelo,
Alves Oswaldo L.,
Stumpf Humberto O.
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800330
Subject(s) - ferrimagnetism , chemistry , nanocomposite , antiferromagnetism , mesoporous material , magnetization , nanomagnet , relaxation (psychology) , coercivity , phase (matter) , condensed matter physics , crystallography , nanotechnology , materials science , organic chemistry , psychology , social psychology , physics , quantum mechanics , magnetic field , catalysis
The ferrimagnetic system CoCu(opba) [opba = ortho ‐phenylenebis(oxamato)] was employed to prepare a traditional chain [CoCu(opba)] · 4H 2 O ( 1 ) and a nanocomposite by incorporation in porous Vycor glass (PVG). This nanocomposite was made by first anchoring [Bu 4 N] 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).(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)