A novel [Cu~(II)_4] cluster from the assembly of two [Cu~(II)_2L]~+ units by a central μ4-1,1,2,2 perchlorate ligand

摘要

A perchlorate ligand in the rare μ-1,1,2,2 binding mode is seen for the first time as the sole support for the assembly of two cationic [Cu~(II)_2L]~+ fragments (H3L = a dinucleating ligand) in the formation of a magnetically-exchanged tetranu-clear cluster.The perchlorate ion with four tetrahedrally-disposed oxygen atoms can function as a structural bridge of paramagnetic metal ions in a variety of coordination modes.