SYNTHESES, SPECTRA, AND MAGNETIC PROPERTIES OF Fe(II) COMPLEXES WITH 7,7′,8,8′- TETRACYANOQUINODIMETHANE

Iron(II) complexes with TCNQ as ligand, Fe(bpy)2(ClO4) (TCNQ) · H2O (1), Fe(Mebpy)2 (ClO4)(TCNQ) · 2H2O · C2H5OH (2), and Fe(btimb)2(ClO4)(TCNQ) · 3H2O (3) (where bpy = 2,2′-bipyridine, Mebpy = 4,4′-dimethyl-2,2′-bipyridine, btimb= o-bis[1-(1,2,4-triazolyl)iminomethyl]benzene, and TCNQ = 7,7′,8,8′-tetracyano-quinodimethane) were prepared, and their spectroscopic and magnetic properties were studied. The metal ion is coordinated by two molecules of bidentate ligand L (L = bpy, Mebpy or btimb), one monodentately coordinated TCNQ− anion and one water molecule. The temperature dependence of the magnetic susceptibility of (1) shows antiferromagnetic interaction between high-spin Fe(II) and the TCNQ− radical with J = −100.4 cm−1 (where H= −2JS 1 · S 2).