THE STRUCTURE OF COPPER(II) WITH 2-HYDROXYETHYL (PROPYL) IMINE -2-HYDROXY-1-BENZALDEHYDE. Yu.M. Chumakov, T.J.Malinowski, Institude of Applied Physics, Kishinev, 277028, Moldova, V. I. Tsapkov, N. M. Samus, Moldavian State University, Kishnev, Moldova
The varions coordination compounds obtained by the interaction of Cu(NO3)2.3H2O with 2-hydroxethyl (propyl) imine-2-hidroxy-1-benzaldehide in function of pH of the medium and the nature of the proton acceptor reagent possess an antiseptic activity, wich depends not only of the composition, but of the structure of the complex as well. In order to clarity this dependence the following complex compounds were synthesized and next analyzed by X-ray methods:
Cu(HL)NO3[I],Cu(3-pic)(HL)NO3[II], Cu(4-pic)(HL)NO3 [III], CuL [IV], CuL [V], Cu(Py)(HL)NO3 [VI], were H2L = 2HOC6H4CHN(CH2)2OH H2L = 2HOC6H4CHN(CH2)3OH.
It was determined, that the coordination polyhedron around the central atom in the compounds I- III is an extended tetragonal pyramide meanwhide the complex are polymers. The compound II is an dimer. The nitrate group serves in the polimer complexes as bridge-ligand, but in dimers this function fulfil the oxigen atom belonging to the phenol group, the nitrate group is threedentate in I, monodentate in II and bidentate in III.
In IV the cooper atom is coordinated fully by the deprotonated molecule H2L through the oxigen atoms of phenol and alcohol and by nitrogen of the imine. The tetramer as cubane complex is formed in the complex compound. The surroundings of the central ion in V is a distorted square formed by oxigen atoms of the phenol and alcohol and of the nitrogen of the azometin H2L. The fourth corner of the square is occupied by the oxigen atom of the neighbouring complex CuL coupled with the initial complex through the centre of symmetry.