Search results for: Harold A. Goodwin
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In this chapter an outline is presented of the principal features of electronic spin crossover. The development of the subject is traced and the various modes of manifestation of spin transitions are presented. The role of cooperativity in influencing solid state behaviour is considered and the various strategies to strengthen it are addressed along with the chemical and physical perturbations which...
chapter
Tris(diimine) and bis(terimine) iron(II) complex salts constitute one of the major classes of spin crossover systems. Both electronic and structural modifications can be made so as to bring the ligand field of the parent imines, 2,2′-bipyridine, 1,10-phenanthroline and 2,2′:6′,2″- terpyridine into the crossover range with some degree of confidence. The resulting imine systems are considered and classified...
chapter
Tris(diimine) and bis(terimine) iron(II) complex salts constitute one of the major classes of spin crossover systems. Both electronic and structural modifications can be made so as to bring the ligand field of the parent imines, 2,2′-bipyridine, 1,10-phenanthroline and 2,2′:6′,2″- terpyridine into the crossover range with some degree of confidence. The resulting imine systems are considered and classified...
chapter
Cobalt(II), a d 7 ion, can exist in a low spin doublet state or a high spin quartet state. Both spin-state configurations are known in four-, five- and six-coordinate complexes. For each of these coordination numbers, systems are known where the two spin states may be thermally interconverted. For four-coordinate and some five-coordinate systems these interconversions are best regarded as configurational...
chapter
In this chapter an outline is presented of the principal features of electronic spin crossover. The development of the subject is traced and the various modes of manifestation of spin transitions are presented. The role of cooperativity in influencing solid state behaviour is considered and the various strategies to strengthen it are addressed along with the chemical and physical perturbations which...
chapter
Cobalt(II), a d 7 ion, can exist in a low spin doublet state or a high spin quartet state. Both spin-state configurations are known in four-, five- and six-coordinate complexes. For each of these coordination numbers, systems are known where the two spin states may be thermally interconverted. For four-coordinate and some five-coordinate systems these interconversions are best regarded as...
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article
Journal of Molecular Structure > 2005 > 738 > 1-3 > 129-136
The crystal structures of tris(2-methyl-1,10-phenanthroline)ruthenium(II) iodide, tris(6-methyl-2,2′-bipyridine)ruthenium(II) tetrafluoroborate and tris(6,6′-dimethyl-2,2′-bipyridine)ruthenium(II) tetrafluoroborate 0.75 hydrate are described. The average Ru–N distances in the complex cations are 2.063, 2.089, and 2.119Å, severally. The substituents in the ligands exert a strong influence on the geometry...
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Inorganica Chimica Acta > 1998 > 274 > 1 > 32-41
Replacement of one of the terminal pyridine rings in terpyridine by a thiazole ring has been found to have little effect on the field strength and the resultant 6-(thiazol-2-yl)-2,2 -bipyridine (thzbpy) yields a purely low-spin [Fe(II) N 6 ] 2 + derivative. When a methyl group is incorporated into the 4-position of the thiazolyl group (mthzbpy) the field strength is reduced but...
