Crystal structures of copper(III) dithiocarbamate complexes [Cu(η2-S2CNMe2)2][ClO4] and [Cu(η2-S2CNEt2)2][FeCl4] with and without anion–cation interactions

Copper(III) dithiocarbamate complexes [Cu(η2-S2CNMe2)2][ClO4] and [Cu(η2-S2CNEt2)2][FeCl4] have been characterised crystallographically. Both contain square-planar Cu(III) centres which attain an overall distorted octahedral coordination environment via long-range intermolecular interactions. In [Cu(η2-S2CNEt2)2][FeCl4], anions and cations do not interact and Cu(III) centres form an infinite chain held together by weak copper–sulfur interactions. In [Cu(η2-S2CNMe2)2][ClO4], perchlorate anions interact weakly with the Cu(III) centre [CuO 2.753(3) Å] which attains overall six coordination via a CuS interaction with a second copper–dithiocarbamate–perchlorate unit.