Complexes of cobalt(II), nickel(II) and copper(II) with a pentadentate Bis(β-amino ketone); Crystal and molecular structure of Aqua(4,4,12,12-tetramethyl-5,8,11-triazapentadecane-2,14-dione)cobalt(II) perchlorate hydrate

Abstract

The diperchlorate salts of the mono(β-amino ketone) 10-amino-4,4-dimethyl-5,8-diazadecan-2-one and of the bis(β-amino ketone) 4,4,12,12-tetramethyl-5,8,11-triazapentadecane-2,14-dione, ttp, have been prepared by reaction of the diperchlorate of 3-azapentane-1,5-diamine with acetone. The salt [ttpH₂] (ClO₄)₂ has been used to prepare the six-coordinate complexes [Cu(ttp)(H₂O)] (ClO₄)₂,1.5H₂O and [Ni(ttp)(H₂O)] (ClO₄)₂,H₂O, and the five-coordinate [Cu(ttp)] (CIO_,)_,. The complex [Cu(ttp)] (ClO₄), reacts with ammonia, methylamine and ethylamine to form complexes of pentadentate β-amino ketone β-amino imine ligands. The structure of [Co(ttp)(H₂O)] (ClO₄)₂,1.5H₂O has been determined by X-ray diffractometry [space group P2₁/c, Z 4, a 797.5(2), b 1632.8(3), c 2236.4(3) pm, β 97.504(2)º, R 0.0749, R_w 0.0765 for 1678 reflections]. The complex cation has the bis(β-amino ketone) ttp acting as a pentadentate ligand, with the three nitrogen and one carbonyl oxygen atoms coplanar, and with oxygen of a water molecule completing distorted octahedral coordination about the cobalt(II) ion.