Macrocyclic complexes .1. Synthesis and characterization of cobalt(II), nickel(II) and copper(II) with [14]2,3,9,10-tetraoxy-6,13-dithia-1,4,5,7,8,11,12,14-octahydro-1,4,5,7,8,11,12,14-octaazacyclotetradecane

A series of macrocyclic complexes of the titled ligand with Co(II), Ni(II) and Cu(II) have been isolated by the action of CS2 on bis-(1,4-diamino-1,4-diaza-2,3-dioxo butane) chelates of Co(II), NI(II) and Cu(II). The coordination template effect governs the steric course of the reaction. The structure of the complexes have been elucidated on the basis of IR. electronic, ESR spectral data, magnetic properties and electrochemical studies. Ail the complexes except copper(II) show two well defined reduction curves corresponding to the formation of a species where the metal ion can be formally assigned on oxidation state of +1 and zero respectively.