Two-step spin transition in a 1D Fe(II) 1,2,4-triazole chain compound

Chemistry : a European Journal
Marinela M DîrtuYann Garcia

Abstract

A thermochromic 1D spin crossover coordination (SCO) polymer [Fe(βAlatrz)3](BF4)2⋅2 H2O (1⋅2 H2O), whose precursor βAlatrz, (1,2,4-triazol-4-yl-propionate) has been tailored from a β-amino acid ester is investigated in detail by a set of superconducting quantum interference device (SQUID), (57)Fe Mössbauer, differential scanning calorimetry, infrared, and Raman measurements. An hysteretic abrupt two-step spin crossover (T1/2(↓) = 230 K and T1/2(↑) = 235 K, and T1/2(↓) = 172 K and T1/2(↑) = 188 K, respectively) is registered for the first time for a 1,2,4-triazole-based Fe(II) 1D coordination polymer. The two-step SCO configuration is observed in a 1:2 ratio of low-spin/high-spin in the intermediate phase for a 1D chain. The origin of the stepwise transition was attributed to a distribution of chains of different lengths in 1⋅2 H2O after First Order Reversal Curves (FORC) analyses. A detailed DFT analysis allowed us to propose the normal mode assignment of the Raman peaks in the low-spin and high-spin states of 1⋅2 H2O. Vibrational spectra of 1⋅2 H2O reveal that the BF4(-) anions and water molecules play no significant role on the vibrational properties of the [Fe(βAlatrz)3](2+) polymeric chains, although non-coordinated water m...Continue Reading

References

Dec 20, 2002·Chemistry : a European Journal·Yann GarciaPhilipp Gütlich
Apr 14, 2005·Journal of the American Chemical Society·Tsuyohiko FujigayaTakuzo Aida
Jan 27, 2007·The Journal of Physical Chemistry. B·J Alberto Rodríguez-VelamazánTakeshi Kawasaki
Sep 23, 2008·Chemistry : a European Journal·Suzanne M NevilleKeith S Murray
Nov 11, 2008·Chemical Communications : Chem Comm·Sylvestre BonnetJan Reedijk
Sep 12, 2009·Chemistry : a European Journal·Víctor MartínezJosé Antonio Real
Nov 16, 2010·Chemistry : a European Journal·Nicolas BréfuelJean-Pierre Tuchagues
Jan 20, 2011·Angewandte Chemie·Michael GriffinGrace G Morgan
Sep 29, 2011·International Journal of Molecular Sciences·Marinela M DîrtuYann Garcia
Oct 2, 2012·Angewandte Chemie·Anders LennartsonChristine J McKenzie
Nov 7, 2012·Chemistry : a European Journal·Olivier Roubeau
Feb 23, 2013·BMJ Case Reports·Peter Ng
Mar 19, 2013·Beilstein Journal of Organic Chemistry·Philipp GütlichYann Garcia
Sep 26, 2013·Physical Chemistry Chemical Physics : PCCP·Yeny A TobonFrançois Guillaume

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Citations

Nov 18, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Denis GentiliMassimiliano Cavallini
Aug 12, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Daniel UnruhFranz Renz
Jan 11, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Roman B MorgunovMarina V Kirman

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