Crystal and molecular structure of binuclear copper acetate mono-α-picoline

Abstract

Green, needle-shaped crystals of copper acetate mono-e-picoline, Cu(ac)2-(e-pic), crystallize in space group P21/c with cell dimensions a=7.675(4), b =20.008(6), c= 8.207(4)~, and fl = 115.99(3) ~ The crystal structure has been solved by the heavy-atom method and refined with the three-dimensional x-ray photographic data to an R factor of 9.2%. The structure consists of binuclear units Cu2(act4(~-pic)2. The Cu-Cu distance is 2.671 ,~. The bond length Cu-N (2 24 A) is significantly longer than the corresponding distance in analogous complexes.

Synthesis, characterization and biological activities of semicarbazones and their copper complexes

“…In this reaction the acetate anions could potentially accept a proton from N3a but instead they are consumed stoichiometrically in forming the Cu 2 (OAc) 4 cluster. Formation of the Cu-acetate bonded complex using the semicarbazone ligands is consistent with reports in the literature[55][56][57][58][59][60][61] and reflect the inherent stability of the (Cu 2 (OAc) 4 ) core.Certain copper complexes of thiosemicarbazone and semicarbazone compounds are described to dissociate in solution[66]. For example for tridentate thiosemicarbazone, in frozen DMSO, the dimer remains intact, but in aqueous solution it converts to [Cu(Fotsc)(H2O)] + (Fotsc: formyl pyridine thiosemicarbazone).The complexation reaction between Cu (OAc) 2 and L4 led to two distinct types of complexes with the same stoichiometry of metals and ligands.…”