The successful design and synthesis of the new bis( pyrazolyl)ethanamine ligand and its copper( I) triphenylphosphine complex is reported. The ligand coordinates to the copper( I) center in a fac tridentate fashion, through both the pyrazolyl rings and the nitrogen atom from the NH2 group. In the solid state, the compound is organized in a 2D noncovalent network by N - H center dot center dot center dot pi and C - H center dot center dot center dot pi interactions and hydrogen bonds. The analogous ligand with a benzyl group substituted on the amine forms a complex with the same copper( I) center that has a similar 2D supramolecular structure and, in addition, is organized by the benzyl synthon into a 3D architecture.