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Dynamics of BF 4 - anion reorientation in the spin-crossover compound [Fe(1-n-propyl-1H-tetrazole) 6 ](BF 4 ) 2 and in its ZnII analogue

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Abstract:

19 F and 11 B spin-lattice relaxation times were measured in [ Zn ( ptz ) 6 ] ( BF 4 ) 2 and in the spin-crossover compound [ Fe ( ptz ) 6 ] ( BF 4 ) 2 . For both compounds BF 4 - anion reorientation is active above 50 K. For [ Zn ( ptz ) 6 ] ( BF 4 ) 2 , the anion-reorientation dynamics is different in the temperature regions of 50-90 K, 90-120 K, and above 150 K; between 120 and 150 K it changes rapidly reflecting a structural change. In [ Fe ( ptz ) 6 ] ( BF 4 ) 2 the mechanism for the paramagnetic relaxation involving the 19 F nuclei is found to be of the diffusion-limited type according to the theory of Lowe and Tse. The present results prove that the spin-crossover takes place in a dynamic surrounding and not in a static crystal lattice.

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Authors and Affiliations

  1. Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, pob. 49, 1525 Budapest, Hungary, , , , , , HU

    M. Bokor, T. Marek & K. Tompa

  2. Department of Nuclear Chemistry, Eötvös University, Budapest, Hungary, , , , , , HU

    A. Vértes

  3. Institut für Anorganische Chemie und Analytische Chemie, Johannes-Gutenberg-Universität Mainz, Germany, , , , , , DE

    P. Gütlich

Authors
  1. M. Bokor
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  2. T. Marek
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  3. K. Tompa
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  4. P. Gütlich
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  5. A. Vértes
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Received 09 February 1999 and Received in final form 14 June 1999

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Bokor, M., Marek, T., Tompa, K. et al. Dynamics of BF 4 - anion reorientation in the spin-crossover compound [Fe(1-n-propyl-1H-tetrazole) 6 ](BF 4 ) 2 and in its ZnII analogue. Eur. Phys. J. D 7, 567–571 (1999). https://doi.org/10.1007/s100530050382

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  • DOI: https://doi.org/10.1007/s100530050382

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