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Issue 40, 2013
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Rotational disorder of bis(mesitylene)vanadium in channels of a triazine inclusion compound

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Abstract

Electron paramagnetic resonance (EPR) was applied to study rotational disorder of bis(mesitylene)vanadium (VBM, S = ½) in channels of 2,4,6-tris(4-Br-phenoxy)-1,3,5-triazine. To ensure a magnetically dilute system, decamethylbis(cyclopentadienyl)ruthenium was used as a main guest to fill the channels. X-ray diffraction confirmed inclusion formation, resulting in an incommensurate host–guest system. EPR spectra were measured using prismatic single crystals oriented to have Bo either parallel to the channel axis c or at any angle in between c and the perpendicular direction. Temperature-dependent spectra were recorded down to 80 K. The analysis revealed two types of paramagnetic guest entities, i.e. VBM (I) and VBM (II). Both showed dynamical effects due to a reorientational motion. VBM (I) is confined to show a molecular axis z distributed around c by a small angle (± 1.25°), whereas for VBM (II) the distribution is completely disordered. The reorientational motions are frozen at low temperature giving for VBM (II) a powder-like EPR spectrum. Analysing EPR intensities allowed us to conclude that the ratio of (I)/(II) species is of the order of 1.5.

Graphical abstract: Rotational disorder of bis(mesitylene)vanadium in channels of a triazine inclusion compound

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Publication details

The article was received on 11 Jun 2013, accepted on 08 Aug 2013 and first published on 09 Aug 2013


Article type: Paper
DOI: 10.1039/C3CE41102H
Citation: CrystEngComm, 2013,15, 8110-8115
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    Rotational disorder of bis(mesitylene)vanadium in channels of a triazine inclusion compound

    A. Barbon, J. Hauser, R. Berger, M. Brustolon and J. Hulliger, CrystEngComm, 2013, 15, 8110
    DOI: 10.1039/C3CE41102H

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