Crystal structure of acetato-μ-N,N′-bis(salicylidene)-3-methyl- 3-aza-1,5-pentanediaminocobalt(III), Co(C2H3O2)(C21H25N3O2)

Abstract

Source of materialCobalt(II) acetate, equimolar 4-methyl-1,4,7-triazaheptane and two equivalent molar salicylaldehyde were dissolved in methanol and mixed together. The clear pink solution gradually got dark red. It was stood still in air for one week. Large cubic crystals were precipitated. They were filtered and washed with methanol and dried in air (yield 68 %). DiscussionCobalt is an important life-required element. Many cobalt(II,III) complexes were prepared and structurally determined by single X-ray analysis [1][2][3][4][5][6][7]. Especially, complexes with various Schiff bases are a hot branch of cobalt chemistry [1,2,4,6,7]. The title compound is a discrete mononuclear cobalt(III) complex. The central cobalt(III) atom is five-coordinated by three oxygen atoms and two nitrogen atoms from one tetradentate diSchiff base ligand and one unidentate acetate anion. The metal is in a distorted square-pyramidal environment with the oxygen atom from the acetate situated in the apical position and the four donors from the Schiff base constituting the basal plane. The mean deviation of the basal plane is 0.151(2) Å, and the central cobalt(III) is 0.131(2) Å above the plane towards the apical oxygen atom. The dihedral angles between the Co basal plane and the two benzene rings in the Schiff base are 36.3(2)°and 28.2(2)°, and the two aromatic rings are at the angle of 64

Crystal structure of bis(4-chloro-2-((3-dimethylaminopropylimino)- methyl)phenolato)thiocyanato-cobalt(III) perchlorate hemihydrate, [Co(C12H16ClN2O)(C12H17ClN2O)(NCS)][ClO4] · 0.5H2O

“…The thiocyanate anion acts as a monodentate ligand and ligates to the metal through the terminal N atom. All the bond lengths and angles subtended at the metal center are typical and comparable to those observed in other cobalt(III) complexes [8][9][10][11][12]. The dihedral angle between the two benzene rings is 31.0(7)°.…”