[Co(NH3)6]3[Cu4(OH)(CO3)8]·2H2O – a new carbonato-copper(ii) anion stabilized by extensive hydrogen bonding

Abstract

Addition of Co(NH₃)₆³⁺ to aqueous solutions of Cu^II in excess carbonate promotes the assembly of a new highly charged carbonato-copper(II) anion, [Cu₄(OH)(CO₃)₈]⁹⁻, which contains an unusual µ₄ hydroxo-bridged square Cu₄ arrangement, stabilised in the crystal by no less than forty hydrogen bonds (<3 Å) to hexammine cations.