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Preparation and properties of a calcium(II)-based molecular chain decorated with manganese(II) butterfly-like complexes

AutorBenniston, Andrew C.; Melnic, S.; Turta, C.; Arauzo, Ana B.; Bartolomé, Juan; Harrington, R. W.; Probert, M. R.
Fecha de publicación2014
EditorRoyal Society of Chemistry (Great Britain)
CitaciónDalton Transactions 43(35): 13349-13357 (2014)
ResumenThe room temperature reaction of [Mn2O2(bipy) 4](ClO4)3 (bipy = 2,2′-bipyridine) with Ca(CHCl2COO)2 in methanol produced a yellow crystalline material. The X-ray determined structure comprises of a multiple calcium(ii) carboxylate bridged chain-like structure which is decorated with [Mn(bipy) 2(OH2)]2+ subunits. The redox behaviour for the complex in H2O and MeCN is reported. In the latter solvent the oxidation of the manganese ions appears to be facilitated by the presence of the calcium ions. Magnetic susceptibility and low temperature magnetization measurements show that the Mn moment is isotropic, with g = 1.99(1) and S = 5/2, confirming it is in the 2+ oxidation state. A very weak antiferromagnetic interaction is also detected. Frequency-dependent ac measurements evidence slow magnetic relaxation of the Mn(bipy)2 units. Two relaxation mechanisms are identified: a very slow direct process and a faster one caused by the Resonant Phonon Trapping mechanism. This is the first example of field-induced single ion magnet (SIM) behavior in a mononuclear Mn(ii) complex. © 2014 The Royal Society of Chemistry.
DescripciónThis Open Access Article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Versión del editorhttp://dx.doi.org/10.1039/C4DT01518E
Identificadoresdoi: 10.1039/C4DT01518E
e-issn: 1477-9234
issn: 1477-9226
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