Supramolecular assembly of ligand-directed triangular [Cu(II)3Cl] clusters with spin frustration and spin-chain behaviour.

Triangular [Cu(II)3Cl] clusters, containing a chloro ligand in an unprecedented trigonal planar coordination mode, are assembled in a 3-D array by the combination of coordinative and hydrogen-bonded interactions, which result in magnetically isolated 1-D chains exhibiting a combination of spin frustration and spin-chain behaviour.