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The Cu(II) aggregate in [Cu(9)(cpida)(6)(MeOH)(6)].6(MeOH)[H(3)cpida = 2-(carboxyphenyl)iminodiacetic acid] is made up of two weakly ferromagnetically coupled carboxylate-bridged Cu(4) units that are antiferromagnetically linked through a central Cu(II) to give a Cu(9) core with an S= 7/2 spin ground state.

Ferrimagnetic oxo-bridged Cu12 aggregates can be organised into a variety of arrays by utilising structure-directing effects of counter ions, solvent molecules and linker units.