Bis(hinokitiolato)copper(II): modification (III)
Abstract
Bis(hinokitiolato)copper(II), Cu(hino)2, exhibits both antibacterial and antiviral properties, and has been previously shown to exist in two modifications. A third modification has now been confirmed, namely tetrakis(2-3-isopropyl-7-oxocyclohepta-1,3,5-trien-1-olato)bis(3-isopropyl-7-oxocyclohepta-1,3,5-trien-1-olato)tricopper(II)-bis(2-3-isopropyl-7-oxocyclohepta-1,3,5-trien-1-olato)bis(3-isopropyl-7-oxocyclohepta-1,3,5-trien-1-olato)copper(II) (1/1), Cu(C10H11O2)23.Cu(C10H11O2)22, where 3-isopropyl-7-oxocyclohepta-1,3,5-trien-1-olate is the systematic name for the hinokitiolate anion. This new modification is composed of discrete cis-Cu(hino)22trans-Cu(hino)2 trimers and cis-Cu(hino)22 dimers. The Cu atoms are bridged by 2-O atoms from the hinokitiolate ligands to give distorted square-pyramidal and distorted octahedral CuII coordination environments. Hence, the CuII environments are CuO5/CuO6/CuO5 for the trimer and CuO5/CuO5 for the dimer. Each trimer and dimer has crystallographically imposed inversion symmetry. The trimer has never been observed before, the dimer has been seen only once before, and the combination of the two together in the same lattice is unprecedented. The CuO5 cores exhibit four strong basal Cu-O bonds 1.915 (2)-1.931 (2) A and one weak apical Cu-O bond 2.652 (2)-2.658 (2) A. The CuO6 core exhibits four strong equatorial Cu-O bonds 1.922 (2)-1.929 (2) A and two very weak axial Cu-O bonds 2.911 (3) A. The bite angles for the chelating hinokitiolate ligands range from 83.13 (11) to 83.90 (10)Degrees.