Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/4672
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Type: Journal article
Title: Structures and spectra of bis-tripodal iron(II) chelates, [FeL₂]²⁺, where L = tris(pyrazol-1-yl)methane, tris(pyridin-2-yl)methane, bis(pyrazol-1-yl)(pyridin-2-yl)methane and tris(pyridin-2-yl)phosphine oxide. Magnetism and spin crossover in the (pz)₃CH case
Other Titles: Structures and spectra of bis-tripodal iron(II) chelates, [FeL(2)](2+), where L = tris(pyrazol-1-yl)methane, tris(pyridin-2-yl)methane, bis(pyrazol-1-yl)(pyridin-2-yl)methane and tris(pyridin-2-yl)phosphine oxide. Magnetism and spin crossover in the (pz)(3)CH case
Author: Anderson, P.
Astley, T.
Hitchman, M.
Keene, F.
Moubaraki, B.
Murray, K.
Skelton, B.
Tiekink, E.
Toftlund, H.
White, A.
Citation: Dalton Transactions (Print Edition), 2000; 2000(20):3505-3512
Publisher: Royal Soc Chemistry
Issue Date: 2000
ISSN: 1477-9226
0300-9246
Statement of
Responsibility: 
Peter A. Anderson, Timothy Astley, Michael A. Hitchman, F. Richard Keene, Boujemaa Moubaraki, Keith S. Murray, Brian W. Skelton, Edward R. T. Tiekink, Hans Toftlund and Allan H. White
Abstract: A range of six-co-ordinate bis-tripodal iron(II) chelates, [FeL₂]²⁺, has been synthesized from iron-(II) or -(III) precursors where L = tris(pyrazol-1-yl)methane (pz)₃CH, tris(pyridyl-2-yl)methane (py)₃CH, bis(pyrazol-1-yl)(pyridin-2-yl)methane (pz)₂(py)CH and tris(pyridin-2-yl)phosphine oxide (py)₃P=O. Crystal structures have been determined for three compounds and in the (pz)₃CH case for two polymorphs (α and β) which were obtained in two different laboratories from iron(III) salts using different crystallisation solvents. The electronic properties of the [FeL₂]²⁺ series have been investigated by optical spectroscopic measurements. Low-spin d⁶ behaviour is indicated. Magnetic and Mössbauer effect measurements on [Fe{(pz)₃CH}₂]²⁺ show that a gradual spin crossover to the high-spin state occurs above 270 K, though this is far from developed at 350 K. Comparisons are made with the well studied boron ligand analogue [Fe{(pz)₃BH}₂], which displays similar crossover behaviour, and with bis(tridentate) ligand complexes containing the ligand 1,4,7-triazacyclononane.
Rights: © The Royal Society of Chemistry 2000
RMID: 0001000777
DOI: 10.1039/b003299i
Appears in Collections:Chemistry publications

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