Synthesis,structure and magnetism of two hexameric copper(II) complexes: Diaquabis[μ-(4-bromobenzoato-O,O′)]-tetrakis(4-bromobenzoato)hexakis[μ-(2-dimethylaminoethanolato)]hexacopper(II) and Bis[μ3-(2-dibutylaminoethanolato)-μ-(2-dibutylaminoethanolato)] tetrakis-(μ-dichloroacetato-O,O′)-bis(dichloroacetato)-di-μ3-hydroxo-hexacopper(II) |