Structure and Magnetic Properties of Iron(II/III) Complexes with N₂O₂^2– Coordinating Schiff Base Like Ligands

Solvent Influence on the Magnetic Properties of Iron(II) Spin‐Crossover Coordination Compounds with 4,4′‐Dipyridylethyne as Linker

“…Selected bond lengths and angles are given in Table 3 is 89.49(6)°, clearly in the range for LS iron(II). [17,24] This is in agreement with the results of the magnetic measurements, which show that the full HS state is only reached above room temperature, therefore it was not possible to determine the structure of the HS state. The L ax -Fe-L ax angle of 175.54(7)°d oes not differ significantly from the expected angle of 180°for a perfect octahedron.…”

“…The average O eq -Fe-O eq angle of 108°is clearly in the range typical of the HS state for iron(II) complexes of this type. [17,24] The average L ax -Fe-L ax angle of 175.1°does not differ significantly from the expected angle of 180°for an ideal octahedron. The >C-C≡C angle has an average value of 176.7°, which indicates a slight bending of the ligand.…”

Complete and incomplete spin transitions in 1D chain iron(ii) compounds

“…The values are within the region reported for HS iron(II) complexes of the same ligand type. [11][12][13][14] Upon spin transition a shortening of the bond lengths of about 10% is observed, as discussed for other iron(II) spin crossover complexes in the literature.…”

“…[11][12][13][14] The average bond lengths in the LS state are 1.91 Å (Fe-N eq ), 1.93 Å (Fe-O eq ) and 2.02 Å (Fe-N ax ). A characteristic tool for the determination of the spin state of this type of iron(II) complexes is the O-Fe-O angle that changes from 1091 in the HS state to 911 in the LS state.…”

“…The two equatorial ligands were so far not used for the synthesis of SCO complexes. They can be derived from the ligands H 2 L3 and H 2 L4, which were demonstrated to be highly suitable for the synthesis of SCO complexes, 11,12 by replacement of two of the methyl groups by phenyl groups. Bimm 13 and bppa 14 were already demonstrated to be suitable for the synthesis of SCO complexes of this ligand type.…”