Crystal Structure of an Iodido-bridged Dinuclear Copper(I) Complex with 3,6-Bis(dimethylamino)acridine

Polynuclear metal complexes have attracted increasing attention in the field of materials science because of their characteristic chemical and/or physical properties based on the assembled structures of metal ions and organic ligands.1,2 In particular, polynuclear copper(I)-halide complexes have the advantage of creating unique functionalities based on the versatile crystal structures derived from the structural diversity in the coordination geometry of the d10 copper(I) ion. For example, it is known that many polynuclear copper(I) complexes show photoluminescent properties from various excited states, such as a triplet metal-toligand charge transfer excited state (3MLCT), triplet clustercentered excited state (3CC), and thermally activated delayedfluorescence (TADF).3–5 We also demonstrated that polynuclear copper(I) halide complexes exhibit semiconducting behavior based on the formation of energy bands. Therefore, it is important to create polynuclear copper(I)-halide complexes to develop the field of materials chemistry.6 Here, we employed an acridine derivative, bis(dimethylamino)acridine (dma-acd), to construct polynuclear copper(I) halide complexes. We found that the reaction of copper(I) iodide with dma-acd ligands produced a dinuclear copper(I)-iodide complex, as shown in Fig. 1. In this paper, we report on the crystal structure of this complex. A dinuclear copper(I) complex [Cu2I2(dma-acd)2] (1) was 2021 © The Japan Society for Analytical Chemistry