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Issue 46, 2013
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5-Aminotetrazole induces spin crossover in iron(III) pentadentate Schiff base complexes: experimental and theoretical investigations

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Abstract

A series of novel mononuclear iron(III) complexes [Fe(saldpt)(atz)] (1) and [Fe(Rsalpet)(atz)] (2a–d) involving 5-aminotetrazole (Hatz) and pentadentate Schiff base ligands (H2saldpt = N,N′-bis(2-hydroxybenzyliden)-1,7-diamino-4-azaheptane, H2salpet = N,N′-bis(2-hydroxybenzyliden)-1,6-diamino-3-azahexane, H25Cl-salpet = N,N′-bis(5-chloro-2-hydroxybenzylidene)-1,6-diamino-3-azahexane, H25Br-salpet = N,N′-bis(5-bromo-2-hydroxybenzylidene)-1,6-diamino-3-azahexane and H23,5Br-salpet = N,N′-bis(3,5-dibromo-2-hydroxybenzylidene)-1,6-diamino-3-azahexane) was prepared and characterized by elemental analysis, FTIR spectroscopy, mass spectrometry, single crystal X-ray analysis, magnetic measurements and 57Fe Mössbauer spectroscopy. In contrast to the high-spin magnetic properties of [Fe(saldpt)(atz)] (1), the complexes [Fe(Rsalpet)(atz)] (2a–d) undergo spin crossover with critical temperatures above 416 K. Furthermore, DFT calculations with the B3LYP functional were employed to investigate the effect of the conductor-like screening model (COSMO) and van der Waals corrections (VDW) as well as relativistic effects with the scalar relativistic second-order Douglas–Kroll–Hess Hamiltonian (DKH2) on low-spin and high-spin molecular geometries and thus on spin crossover parameters (enthalpy, entropy and critical temperature).

Graphical abstract: 5-Aminotetrazole induces spin crossover in iron(iii) pentadentate Schiff base complexes: experimental and theoretical investigations

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Publication details

The article was received on 22 Aug 2013, accepted on 24 Sep 2013 and first published on 25 Sep 2013


Article type: Paper
DOI: 10.1039/C3DT52301B
Citation: Dalton Trans., 2013,42, 16279-16288
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    5-Aminotetrazole induces spin crossover in iron(III) pentadentate Schiff base complexes: experimental and theoretical investigations

    R. Herchel and Z. Trávníček, Dalton Trans., 2013, 42, 16279
    DOI: 10.1039/C3DT52301B

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