Structural, Magnetic, and Electrochemical Characterization of Iron(III) and Cobalt Complexes with Penta‐N3O2‐dentate Ligands

Six new mononuclear [Fe-III(L-Br,L-Cl)X]-complexes (L-Br,L-Cl is the dianionic penta-N3O2-dentate Schiff base ligand N,N '-bis(2'-hydroxy-3-bromo-5-chlorobenzylidene)-1,6-diamino-3-azahexane; X: Cl-, N-3(-), NCO-, NCS-, NCSe-, CN-) were synthesized and their structures, magnetic and electrochemical properties studied. Structure analysis and magnetic measurements showed that [Fe-III(L-Br,L-Cl)CN] is in the low spin state and the other five complexes are in high spin states. Furthermore, the trinuclear mixed valent cobalt complex {[Co-III(L-H,L-H)CN](2)[Co-II(1-methylimidazole)(3)(H2O)]} was prepared and its magnetic behavior studied.