Journal article
Partial spin crossover behaviour in a dinuclear iron(ii) triple helicate
RJ Archer, CS Hawes, GNL Jameson, V McKee, B Moubaraki, NF Chilton, KS Murray, W Schmitt, PE Kruger
Dalton Transactions | ROYAL SOC CHEMISTRY | Published : 2011
DOI: 10.1039/c1dt11381j
Abstract
Reported herein are the synthesis, structural, magnetic and Mössbauer spectroscopic characterisation of a dinuclear Fe(ii) triple helicate complex [Fe2(L)3](ClO4)4.xH2O (x = 1-4), 1(H2O), where L is a bis-bidentate imidazolimine ligand. Low temperature structural analysis (150 K) and Mössbauer spectroscopy (4.5 K) are consistent with one of the Fe(ii) centres within the helicate being in the low spin (LS) state with the other being in the high-spin (HS) state resulting in a [LS:HS] species. However, Mössbauer spectroscopy (295 K) and variable temperature magnetic susceptibility measurements (4.5-300 K) reveal that 1(H2O) undergoes a reversible single step spin crossover at one Fe(ii) centre ..
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Awarded by Science Foundation Ireland
Awarded by Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy
Awarded by Science Foundation Ireland (SFI)
Funding Acknowledgements
The authors thank the University of Canterbury (Scholarship to CSH); the Royal Society of New Zealand Marsden Fund (PEK); the Science Foundation Ireland (WS; 08/IN.1/I2047), and; the Australian Research Council (KSM) for financial support. VMcK thanks the University of Canterbury for the award of an Erskine Visiting fellowship. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC0-205CH11231. The authors also thank Dr Anthea Lees for helpful discussion.