A new 3-D polymeric spin transition compound: [tris(1,4-bis-(tetrazol-1-yl) butane-N1,N1′)iron(II)] bis(perchlorate)

Petra J. van Koningsbruggen, Yann Garcia, Huub Kooijman, Anthony L. Spek, Jaap G. Haasnoot, Olivier Kahn, Jorge Linares, Epiphane Codjovi, François Varret

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Abstract

A series of novel polymeric compounds of formula [M(btzb)3][ClO4]2 (Mll = Fe, Ni or Cu) with btzb = 1,4-bis-(tetrazol-1-yl)butane have been prepared and their physical properties investigated. The btzb ligand has been prepared and its crystal structure determined, together with a tentative crystal structure of the 3-D compound [Fe(btzb)3][ClO4]2. The model of the latter shows two symmetry-related, interpenetrating Fe-btzb networks in which the iron(II) ions approach each other as close as 8.3 and 9.1 Å. This supramolecular catenane undergoes a sharp thermal spin transition around 160 K with hysteresis (20 K) along with a pronounced thermochromic effect. The spin crossover behaviour has been followed by magnetic, DSC, optical spectroscopy and 57Fe Mössbauer spectroscopy measurements. Irradiation with green light at low temperature leads to population of the metastable high-spin state for the thermally active iron(ll) ions. The nature of the spin crossover behaviour has been discussed in detail.

Original languageEnglish
Pages (from-to)466-471
Number of pages6
JournalDalton Transactions
Issue number4
DOIs
Publication statusPublished - 29 Jan 2001

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    van Koningsbruggen, P. J., Garcia, Y., Kooijman, H., Spek, A. L., Haasnoot, J. G., Kahn, O., Linares, J., Codjovi, E., & Varret, F. (2001). A new 3-D polymeric spin transition compound: [tris(1,4-bis-(tetrazol-1-yl) butane-N1,N1′)iron(II)] bis(perchlorate). Dalton Transactions, (4), 466-471. https://doi.org/10.1039/b008073j