Complete post-synthetic modification of a spin crossover complex

The post-synthetic reaction between p -anisaldehyde and the spin-crossover compound [Fe(NH 2 -trz) 3 ](NO 3 ) 2 was explored, obtaining different degrees of transformation from 23% to full conversion by varying the reaction time. The post-synthetic SCO complexes obtained were studied by magnetometry, powder X-ray diffraction (PXRD), elemental analysis, solid state NMR and IR and compared with the corresponding compounds obtained by direct synthetic routes, revealing new spin crossover properties. Complete post-synthetic (PS) modification of an irontriazole SCO complex is reported; and a full characterization is carried out for a series of PS-SCO complexes with 23%100% modification.