Syntheses, spectra, and magnetic properties of Fe(II) complexes with 7,7 ',9,8 '-tetracyanoquinodimethane

Iron(II) complexes with TCNQ as ligand, Fe(bpy)(2)(ClO4) (TCNQ) . H2O (1), Fe(Mebpy)(2)(ClO4)(TCNQ) . 2H(2)O . C-2 H5OH (2), and Fe(btimb)(2)(ClO4)(TC NQ) . 3H(2)O (3) (where bpy = 2,2'-bipyridine, Mebpy = 4,4'-dimethyl-2,2'-b ipyridine. btimb = o-bis[1-(1,2,4-triazolyl)iminomethyl]benzene, and TCNQ = 7,7',8,8'-tetracyano-quinodimethane) were prepared, and their spectroscopi c and magnetic properties were studied. The metal ion is coordinated by two molecules of bidentate ligand L (L = bpy, Mebpy or btimb), one mono-dentat ely coordinated TCNQ(-) anion and one water molecule. The temperature depen dence of the magnetic susceptibility of (1) shows antiferromagnetic interac tion between high-spin Fe(II) and the TCNQ(-) radical with J = -100.4cm(-1) (where H = -2JS(1) . S-2).