“…No residual diffraction peaks of CuBr 2 and PDABr 2 were detected in XRD pattern of PDACuBr 4 , which implied the complete reaction of CuBr 2 and PDABr 2 to generate pure PDACuBr 4 . We used EXPO computer program to characterize the crystal structure of PDACuBr 4 , 41–43 and the results suggest that PDACuBr 4 exhibits monoclinic crystal structure with a = 8.865 Å, b = 8.498 Å, c = 15.587 Å, α = γ = 90°, and β = 96.446°. The main diffraction peaks of PDACuBr 4 are located at 2θ = 10.06°, 16.21, 26.3°, 30.5°, 32.6°, and 41.3°, which are associated with the lattice planes of (100), (101), (111), (−211), (202), and (−401), respectively.…”