A study of the thermal and light induced spin transition in [FeL2](BF4)2 and [FeL2](ClO4)2 L=2,6-di(3-methylpyrazol-1-yl)pyrazine

Dalton Transactions : an International Journal of Inorganic Chemistry
Victoria A MoneyJudith A K Howard

Abstract

The spin crossover compounds [FeL2](BF4)2, L=2,6-di(3-methylpyrazol-1-yl)pyrazine and [FeL2](ClO4)2 have very unusual two stage spin transitions which are initially steep and then become more gradual. A detailed variable temperature single crystal X-ray diffraction study has shown that the course of the spin transition is controlled by an order-disorder transition in the counter anions. The high and low spin states both crystallise in the tetragonal space group I4, the structures of the high and low spin states are presented at 290 and 30 K, respectively. The title compounds are shown to undergo LIESST (Light Induced Excited Spin State Trapping) under irradiation with either red or green laser light with wavelengths of 632.8 and 532.06 nm, respectively, at 30 K. The cell parameters for the tetragonal photo-induced metastable high spin state at this temperature are a= 9.169(6), c= 17.77(1) A for [FeL2](ClO4)2 with an increase in unit cell volume of 21 A3, and a= 9.11(1), c= 17.75(2) A and an increase in volume of 42.8 A3 for [FeL2](BF4)2.

References

Jun 12, 2001·Inorganic Chemistry·S HayamiO Sato
Jan 10, 2002·Journal of the American Chemical Society·Mathieu MarchivieDaniel Chasseau
Mar 4, 2003·Chemical Communications : Chem Comm·Victoria A MoneyJudith A K Howard

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Citations

May 25, 2011·Chemical Communications : Chem Comm·Stephan SchlampYann Garcia
Oct 4, 2008·Proceedings of the National Academy of Sciences of the United States of America·G T BurdzinskiC Turro
Apr 8, 2017·Chemistry : a European Journal·Kay E BurrowsMalcolm A Halcrow
Apr 27, 2005·Dalton Transactions : an International Journal of Inorganic Chemistry·Jerome ElhaikMalcolm A Halcrow
Oct 9, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Maria KsiążekMarek Weselski
Aug 20, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Colin A Kilner, Malcolm A Halcrow
Sep 11, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Che-Hsiu ShihMasaki Takata
Jan 27, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Jérôme ElhaïkMalcolm A Halcrow
Feb 18, 2011·Chemistry : a European Journal·Gavin A CraigGuillem Aromí
Jun 21, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Chiara CarboneraJean-François Létard
Feb 1, 2007·Chemical Communications : Chem Comm·Ruth PritchardMalcolm A Halcrow
Mar 21, 2007·Dalton Transactions : an International Journal of Inorganic Chemistry·Chiara CarboneraMalcolm A Halcrow
Aug 6, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Pradip ChakrabortyAndreas Hauser
Nov 7, 2012·Angewandte Chemie·Paulo N MartinhoGrace G Morgan
Apr 12, 2013·Chemistry : a European Journal·Maksym SeredyukJose Antonio Real
Jul 15, 2004·Dalton Transactions : an International Journal of Inorganic Chemistry·V A MoneyJ A K Howard
Apr 13, 2011·Chemical Society Reviews·Malcolm A Halcrow
Sep 15, 2018·Journal of the American Chemical Society·Teresa DelgadoCéline Besnard

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