Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/90958
Type: Artigo de periódico
Title: A New Molecular Magnetic Semiconductor Based On Tetrathiafulvalene (ttf) And Oxamato Ligand (opba): [ttf]2[cu(opba)]·h2o
Author: Dias M.C.
Stumpf H.O.
Mambrini R.V.
Matencio T.
Sansiviero M.T.C.
Knobel M.
Abstract: An oxamato-based compound of formula [ttf]2[Cu(opba)] ·H2O, with ttf = tetrathiafulvalene and opba = ortho-phenylenebis(oxamato), has been prepared and characterized. The complex was obtained by metathesis from (ttf)3(BF4)2 and (Bu4N)2[Cu(opba)] in acetonitrile at room temperature. The UV-Vis-NIR spectrum reveals the presence of the radical cation in two forms, (ttf•+) and (ttf•+)2 dimer. The electronic transport properties of [ttf]2[Cu(opba)]·H 2O were studied by impedance spectroscopy (IS) and linear voltammetry (LV), and show a typical semiconductor behavior. The EPR spectra exhibit two superposed lines corresponding to electron spins of CuII ions and ttf•+ radical cations. The dc magnetic properties show a room temperature value of the χMT product close to that expected for three uncoupled S = 1/2 spins and a value of 0.13 emu K mol-1 at low temperature (4 K). The χMT vs. T curve was fitted and the best model consists of a term for a (ttf•+)2 dimer (Bleaney-Bowers, leading to J2 = -186 cm-1) and a second term related to an antiferromagnetic {Cu...ttf•+} chain (J 1 = -10.1 cm-1).
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Rights: aberto
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Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-77954254503&partnerID=40&md5=a8bf0e18e63fb5075a67556fc66d68b7
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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