Supramolecular aspects of iron(II) crown-dipyridyl spin-crossover compounds |
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| Authors: | Ian A Gass Stuart R Batten Craig M Forsyth Boujemaa Moubaraki Caspar J Schneider Keith S Murray |
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| Institution: | School of Chemistry, Monash University, Building 23, Clayton, Victoria 3800, Australia |
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| Abstract: | The synthesis, structures and magnetism of the complexes FeII(3-bpp)2]bpmdcK](SeCN)1.7(ClO4)1.3·MeOH·H2O (1), FeII(3-bpp)2]4bpmdcH2(H2O)2](ClO4)10·7H2O·3MeOH (2) and cis-FeII2(NCSe)2((3,5-Me2pz)3CH)2(μ-bpmdc)]·2MeCN (3) (where 3-bpp = 2,6-di(pyrazole-3yl)pyridine, bpmdc = N,N′-bis(4-pyridyl-methyl)diaza-18-crown-6) and (3,5-Me2pz)3CH = tris(3,5-dimethylpyrazole)methane, are presented. These compounds form a study of the supramolecular influence of host–guest/crown-ether interactions and cation-to-crown hydrogen-bonding effects upon d6 spin transitions, the latter occurring above, or near to, room temperature in 1 and 2. Desolvation effects also influence the T1/2 values. The dinuclear compound 3 contains covalent pyridyl (crown) N to Fe bridge bonding and remains high spin. |
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