(+ac,-ac)-trans-Bis(hinokitiolato)copper(II) and its chloroform disolvate.

The complex trans-bis(hinokitiolato)copper(II) [systematic name: trans-bis(3-isopropyl-7-oxocyclohepta-1,3,5-trienolato)copper(II); abbreviated name: trans-Cu(hino)2], [Cu(C10H11O2)2], is a biologically active compound. Three polymorphs of this square-planar monomer, all with (+sp,-sp) isopropyl substituents, have been reported previously. A fourth polymorph containing (+ac,-ac) isopropyl groups and its chloroform disolvate, [Cu(C10H11O2)2].

Two new polymorphs of trans-bis(hinokitiolato)copper(II).

The title complex [systematic name: trans-bis(3-isopropyl-7-oxocyclohepta-1,3,5-trienolato)copper(II)], [Cu(C10H11O2)2], is a substance possessing antimicrobial activity. The compound crystallizes in a number of polymorphic forms, the structures for two of which are reported here. Stacks of square-planar molecules exhibiting weak intermolecular copper-olefin pi interactions (not observed in earlier reports on this substance) are described.