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Special Classes of Iron(II) Azole Spin Crossover Compounds

  • Petra J. van KoningsbruggenEmail author
Chapter
Part of the Topics in Current Chemistry book series (TOPCURRCHEM, volume 233)

Abstract

In this chapter, selected results obtained so far on Fe(II) spin crossover compounds of 1,2,4-triazole, isoxazole and tetrazole derivatives are summarized and analysed. These materials include the only compounds known to have Fe(II)N6 spin crossover chromophores consisting of six chemically identical heterocyclic ligands. Particular attention is paid to the coordination modes for substituted 1,2,4-triazole derivatives towards Fe(II) resulting in polynuclear and mononuclear compounds exhibiting Fe(II) spin transitions. Furthermore, the physical properties of mononuclear Fe(II) isoxazole and 1-alkyl-tetrazole compounds are discussed in relation to their structures. It will also be shown that the use of α,β- and α,ω-bis(tetrazol-1-yl)alkane type ligands allowed a novel strategy towards obtaining polynuclear Fe(II) spin crossover materials.

Keywords

Spin crossover Fe(II) 1,2,4-Triazole Isoxazole Tetrazole 

Abbreviations

4-R-trz

4-substituted-1,2,4-triazole

Htrz

1,2,4–4H-triazole

trz

1,2,4-triazolato

hyetrz

4-(2′-hydroxy-ethyl)-1,2,4-triazole

NH2trz

4-amino-1,2,4-triazole

Hpt

3-(pyridin-2-yl)-1,2,4-triazole

H3mpt

3-methyl-5-(pyridin-2-yl)-1,2,4-triazole

abpt

4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole

TCNQ

7,7′,8,8′-tetracyanoquinodimethane

phen

1,10-phenanthroline

mbpt

4-p-methylphenyl-3,5-bis(pyridin-2-yl)-1,2,4-triazole

mmbpt

4-m-methylphenyl-3,5-bis(pyridin-2-yl)-1,2,4-triazole

btzp

1,2-bis(tetrazol-1-yl)propane

btze

1,2-bis(tetrazol-1-yl)ethane

btzb

1,4-bis(tetrazol-1-yl)butane

LIESST

light-induced excited spin-state trapping

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Notes

Acknowledgments

Some of this work was funded in part by the TMR Research Network ERB-FMRX-CT98–0199 entitled “Thermal and Optical Switching of Molecular Spin States (TOSS)”. I am grateful to Professor Philipp Gütlich for the kind provision of work facilities at the Johannes-Gutenberg University, (Mainz, Germany).

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Authors and Affiliations

  1. 1.Stratingh Institute of Chemistry and Chemical EngineeringUniversity of GroningenGroningenThe Netherlands

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