Synthesis, crystal structure and properties of [Mn(hdpa)2(N(CN)2)2] and [Co(hdpa)2(N(CN)2)2] (hdpa=2,2′-dipyridylamine)

Two new transition metal(II) complexes [M(hdpa)(2)(N(CN)(2))(2)] (M = Mn (1), Co (2); hdpa = 2,2'-dipyridylamine) have been prepared and characterized structurally and magnetically. Both compounds crystallize in the monoclinic space group C2/c. 1 and 2 are isotypic with the unit cell parameters a = 8.634(9), b 13.541(14), c = 21.99(2) Angstrom, beta = 94.806(18)degrees, and V = 2562(5) Angstrom(3) for 1, a = 8.617(3) Angstrom, b = 13.629(5) Angstrom, c = 21.598(8) Angstrom, beta = 94.593(6)degrees, and V = 2528.4(15) Angstrom(3) for 2, and Z = 4 for both. According to X-ray crystallographic studies, each metal(II) ion was six-coordinated with four nitrogen atoms from two bidentate hdpa ligand and two nitrogen atoms from two N(CN)(-) anions to form slightly distorted octahedrons. Adjacent complex molecules are connected by hydrogen bonds or pi(...)pi interactions to form three-dimensional network. The IR and UV spectroscopy were measured and the magnetic behaviors were investigated.