*2.3. Synthesis of [Cu2(ACR)(NO3)2]*

ACR dendrimer (0.219 g, 0.1 mmol) was dissolved in 20 mL of ethanol and Cu(NO3)2·3H2O (0.113 g, 0.6 mmol) was added to the solution. The mixture was stirred for 2 h, and the solid formed was filtered, washed with ethanol three times, and dried under vacuum. Yield: 0.225 g, 88.1%

FT-IR cm<sup>−</sup>1: 1638, 1691, 1531, 1466, 1367, 1298, 1173, 1037, 826, 754, 661.

Analysis: C144H152N26O12Cu2 (2564.8 g mol<sup>−</sup>1) Calculated (%): C 67.43, H 5.93, N 14.20; Found (%): C 67.54, H 5.88, N 14.28
