The first [5+5] isomer of a Zn(II) dimer helicate derived from pentadentate thiosemicarbazones

Abstract: The first [5+5] coordination isomer of a zinc helical dimer derived from a pentadentate bisthiosemicarbazone Schiff base ligand was obtained by means of a new route. This compound was synthesised using a template procedure, spectroscopically characterised and recrystallised in a 1:1 v/v dichloromethane/acetonitrile mixture. The geometry showed by this compound is new for well-known dimer zinc complexes derived from pentadentate thiosemicarbazones and suggests that the experimental procedure could be an important factor in defining the stereochemistry of the metal atoms in such helical dimers. [Copyright &y& Elsevier]