Trivalent copper and indium heterometallic complex with dithiocarbamate and iodide ligands

The heterometallic Cu-In complex salt [Cu(III) (dtc)(2)][In(III)I-4](1) (dtc = S2CNEt2, diethyldithiocarbamate) was prepared by reactions of Cu(II) (dtc)(2) and In(III)I-3 in benzene solution. As a redox reaction, Cu(II) (dtc)(2) was oxidized to [Cu(III) (dtc)(2)](+), and In(III)I-3 was changed to [In(III)I-4](-). The square-planar Cu(III)S-4 local symmetry of 1 involves a distorted octahedral coordination environment via long-range intermolecular interactions and represents a new one-dimensional structure of [Cu(III) (dtc)(2)](+) units. The crystal packing system of 1 consists of many [Cu(III) (dtc)(2)](+) chains surrounded by six parallel chains without solvent molecules. The infrared spectra of 1 showed a higher-frequency C-N thioureide bond in Cu(III) (dtc)(2) than that of pristine Cu(II) (dtc)(2), which has a lower oxidation state due to the Cu(II) center. (C) 2019 Elsevier B.V. All rights reserved.