Organic–inorganic copper(I) halide complexes have attracted attention due to their optoelectronic properties and non-toxic nature. In this study, we systematically synthesized copper(I) halide melamine complexes as single crystals, (CuBr(melamine) and CuI(melamine)) and polycrystalline powders, CuBrxI1-x(melamine) (0 ≤ x ≤ 1). The crystal structures of CuBr(melamine) and CuI(melamine) are isotypic with a triclinic space group P (Formula presented.), where copper(I) is connected with three adjacent halides along the a-axis and a single melamine ligand along the c-axis, forming an infinite stair-chain structure. The photoluminescence emission peaks of CuBrxI1-x(melamine) (0 ≤ x ≤ 1) show a red shift from 455 nm to 520 nm with the substitution of Br for I. This finding explains the structure–property relationship of organic–inorganic copper(I) halide complexes and provides guidelines for developing new organic–inorganic optoelectronic materials.
This work was supported by the National Research Foundation of Korea (NRF) funded by the Korean government (MSIT) (No. NRF\u20102022R1F1A1071325) and Global\u2010Learning & Academic research institution for Master's PhD students and Postdocs (G\u2010LAMP) Program of the National Research Foundation of Korea (NRF) grant funded by the Ministry of Education (No. RS\u20102023\u201000285390), and the H2KOREA funded by the Ministry of Education (2022 Hydrogen fuel cell\u2010002, Innovative Human Resources Development Project for Hydrogen Industry).
