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Título : Magnetic interaction between manganese (2+) atoms through aquo bridges and bifurcated cyano groups
Fecha de publicación : 16-ene-2013
Descripción : The magnetic interaction between adjacent manganese atoms through aquo double bridges in Mn2[M(CN)6]·xH2O where x = 8 and 2 and M= Fe, Ru, Os, was studied. Through these bridges a relatively weak antiferromagnetic interaction is established with an estimated Curie–Weiss temperature, |θCW|, close to 4 K and a super exchange constant, |J |, of 0.27 cm−1. When these materials are dehydrated the antiferromagnetic interaction between the Mn atoms undergoes a dramatic increase, with estimated values for |θCW| and |J | of 61 K and 4.11 cm−1, respectively. Such reinforcement in the magnetic interaction is accompanied by a shift of 32 cm−1 for the ν (CN) vibration towards the low frequency region while for the iron compound the M¨ossbauer spectrum, initially a single line, becomes a quadrupole splitting doublet of relatively low isomer shift (δ) value. The Curie constant of the involved Mn atoms shows a negative correlation with the observed shifts in ν (CN) and δ on dehydration. From the observed magnetic behaviour and the spectroscopic data a double coordination of an N end of the CN ligand to two Mn atoms is proposed. Such strong magnetic interaction through the N atom of the CN ligand could be used as a prototypical bridge to obtain high Tc molecular magnets.
URI : http://www.repositoriodigital.ipn.mx/handle/123456789/11212
Otros identificadores : J. Phys.: Condens. Matter 19 (2007) 056202 (11pp)
Aparece en las colecciones: Doctorado

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