Spin Crossover in Pyrazolylborate and Pyrazolylmethane Complexes View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

2004

AUTHORS

Gary J. Long , Fernande Grandjean , Daniel L. Reger

ABSTRACT

The electronic spin-state crossover observed upon cooling and at high-pressure in the iron(II) and cobalt(II) complexes formed with the HB(pz)3 -and HC(pz)3 ligands and their various methyl derivatives span a variety of different behaviors. Specifically [Fe(HB(pz)3)2], which is low-spin at 295 K, undergoes a spin state crossover to the high spin state both upon heating to ca. 420 K and at high pressure. [Fe(HB(3,5-(CH3)2pz)3)2], which is high-spin at 295 K, undergoes a spin state crossover to the low spin state both upon cooling below ca. 195 K and at high pressure. In contrast, [Fe(HB(3,4,5-(CH3)3pz)3)2] remains high-spin between 1.9 and 295 K but is gradually converted to the low-spin state with increasing pressure. Similarly, [Fe(HC(pz)3)2](BF4)2, which is low-spin at 295 K, undergoes a spin-state crossover to the high spin state upon heating. In a parallel fashion, [Fe(HC(3,5-(CH3)2pz)3)2]I2, which is high-spin at 295 K, is completely converted to the low-spin state upon cooling. In contrast, [Fe(HC(3,5-(CH3)2pz)3)2](BF4)2, which is high-spin at 295 K, exhibits a phase transition upon cooling below 206 K in which only one-half of the iron(II) is converted to the low-spin state; the remaining one-half of the iron(II) remains high-spin even upon cooling to 4.2 K. This chapter presents a detailed discussion of these spin-state changes and those observed in the related cobalt(II) complexes. More... »

PAGES

91-122

Book

TITLE

Spin Crossover in Transition Metal Compounds I

ISBN

978-3-540-40394-4
978-3-540-44981-2

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/b13530

DOI

http://dx.doi.org/10.1007/b13530

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1006627186


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