Synthesis, structures and properties of three copper complexes with dibutyldithiocarbamate ligand

Three copper complexes constructed with sulfur-containing dibutyldithiocarbamate ligand (DDTC), [(Et₂NCS₂)₄Cu₂] (1), [(Et₂NCS₂)(EtO)Cu]₂ (2) and [(Et₂NCS₂)₆Cu₁₃I₁₀]_n (3) have been synthesized through the reaction of CuI with different mole ratios of DDTC under solution-diffusion conditions. The single crystal X-ray diffraction revealed that divalent Cu cations in complexes 1 and 2 imply that the reactant, Cu(I), was involved in the redox process. They formed binuclear complexes according to bridging S from DDTC ligands and O atoms from ethanol molecules respectively. The mixed valence Cu cations had two types of coordination environments in complex 3 and formed a two-dimensional layered coordination polymer by bridging the five-core Cu(I) clusters and Cu(II). The powder X-ray diffraction, luminescent, thermogravimetric analysis, etc. were also studied in this paper.