BINUCLEAR COPPER-COMPLEXES OF BIS(1,4,7-TRIAZACYCLONON-1-YL) LIGANDS INCORPORATING ACETATE PENDANT ARMS

Two new bis(pentadentate) compounds, boxymethyl)-1,4,7-triazacyclonon- 1-yl]ethane(L(1)) and is(carboxymethyl)-1,4,7-triazacyclonon-1-yl]buta ne (L(2)), have been prepared by functionalisation of the correspondin g alkyl-bridged bis(macrocycles) with acetate pendant arms. Their binu clear copper(II) complexes have been prepared and characterised by X-r ay crystallography. Both [Cu(2)L(1)]. 5H(2)O and [Cu(2)L(2)]. 2H(2)O a re centrosymmetric about the alkyl bridge with the pentadentate compar tments hosting the copper(Ii) centres oriented away from one another. Each Cu-II exhibits distorted square-pyramidal geometry with an N2O2 b asal plane and an apical N atom.