Co-ordination behaviour of various 2-pyridyl ketones. Part I. Copper(II) halide and perchlorate complexes with di-2-pyridyl ketone and 2-benzoylpyridine

Abstract

Copper(II) perchlorate yields the following hexaco-ordinate complexes with di-2-pyridyl ketone (pyCOpy) and 2-benzoylpyridine (PhCOpy): Cu(pyCOpy)2(ClO4)2(NN-co-ordination), [Cu(pyCOpy)2(H2O)2], (ClO4)2(NO-co-ordination), and Cu(PhCOpy)2(ClO4)2. The complexes M(PhCOpy)2X2(M = CuII or ZnII; X = Cl or Br) are hexaco-ordinate compounds with weak interaction between the carbonyl group and the metal ion. The nature of the complex Cu(pyCOpy)2Cl2,2H2O is discussed. The compounds Cu(pyCOpy)X2,ROH (X = Cl or Br; R = Et or Prn)(NO-co-ordination) possibly contain pentaco-ordinate copper(II) whereas Cu(PhCOpy)Cl2 and Cu(pyCOpy)Cl2(NN-co-ordination) are considered to be planar complexes. Red-brown Cu(PhCOpy)Br2 is suggested to be a tetrahedral compound.