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Different structural arrangements observed in the products of the reaction between crystalline trans-[CuX2(3-Xpy)2] and HCl or HBr gases. The colors of the arrows and of the chemical formulas are associated. Metal and halide ligands are shown in red, organic halogens in green, and all other atoms in blue (C, H, N). Black dotted lines represent HBs and XBs. Reprinted with permission from ref (778). Copyright 2011 Royal Society of Chemistry.
