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Spin-crossover compounds based on iron(II) complexes of 2,6-bis(pyrazol-1-yl)pyridine (bpp) functionalized with carboxylic acid and ethyl carboxylic acid

Abstract

Four new salts of the iron(II) complex of 2,6-bis(pyrazol-1-yl)pyridine ligand functionalized with a carboxylic acid group (bppCOOH) of formulas [Fe(bppCOOH)2](BF4)2 (1(BF4)2), [Fe(bppCOOH)2](CF3SO3)2·yMe2CO (1(CF3SO3)2·yMe2CO), [Fe(bppCOOH)2](AsF6)2·yMe2CO (1(AsF6)2·yMe2CO) and [Fe(bppCOOH)2](SbF6)2·yMe2CO (1(SbF6)2·yMe2CO) have been prepared and characterized together with a more complete structural and photomagnetic characterization of the previously reported [Fe(bppCOOH)2](ClO4)2 (1(ClO4)2). Furthermore, the iron(II) complex of the ethyl ester derivative of bppCOOH (bppCOOEt) has been prepared and characterized (compound [Fe(bppCOOEt)2](ClO4)2·yMe2CO, 2(ClO4)2·yMe2CO). Isostructural 1(BF4)2 and 1(ClO4)2 show an abrupt and reversible spin transition with a much lower T1/2 for the BF4- salt. CF3SO3-, SbF6- and AsF6- counteranions and bppCOOEt ligand lead to the incorporation of solvent molecules in the structures, which play an important role in the spin crossover properties of these compounds. In the case of 1(CF3SO3)2·yMe2CO, a reversible spin transition is obtained after desolvation. All these compounds show LIESST effect.

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Publication details

The article was received on 29 Aug 2018, accepted on 06 Nov 2018 and first published on 06 Nov 2018


Article type: Paper
DOI: 10.1039/C8DT03511C
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Spin-crossover compounds based on iron(II) complexes of 2,6-bis(pyrazol-1-yl)pyridine (bpp) functionalized with carboxylic acid and ethyl carboxylic acid

    M. Clemente Leon, V. García-López, M. Palacios-Corella, A. Abhervé, I. Pellicer-Carreño, C. Desplanches and E. Coronado, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT03511C

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