Synthesis and Characterization of Cobalt(II) and Copper(II) Tricyanomethanide (tcm) Complexes with 2,2′‐Dipyridyl N , N ′‐Dioxide (dpdo) as Co‐ligands:[Co(dpdo)(tcm) 2 ], [Cu(dpdo)(tcm) 2 ] and Cu(dpdo) 2 (tcm) 2

Three new transition metal tricyanomethanide complexes [Co(dpdo)(tcm) 2 ] ( 1 ), [Cu(dpdo)(tcm) 2 ] ( 2 ) and Cu(dpdo) 2 (tcm) 2 ( 3 ) were synthesized and structurally characterized. In compound 1 each Co(II) ion is coordinated to four disorder tcm anions and one dpdo molecule to give a distorted octahedral geometry. In compound 2 each Cu(II) ion is surrounded by four tcm anions and one dpdo ligand to form a square bipyramidal geometry. Both compounds 1 and 2 display a µ 1,5 ‐tcm bridged infinite chain structure. Interestingly, in compound 3 coordination geometry around the central ion is square‐planar, each Cu(II) ion is coordinated by two dpdo molecules to form a cationic part, the cationic parts is linked with the free tcm anionic parts via electrostatic attraction, leading to the formation of a mononuclear structure. Magnetic susceptibility measurement in the range 2 – 300 K indicates that there are antiferromagnetic couplings between adjacent metal ions in 1 ( θ =−2.33 K, C =2.13 cm 3 ·mol −1 ·K) and 2 ( J =−0.30, g =2.20) respectively.