The metal salt (Cu(NO3)2•3H2O: 5.0 mg, 21 mmol or CuSO4: 5.0 mg, 31 mmol) was dissolved in DMF (1.6 mL for CuSO4; 1.1 mL for Cu(NO3)2•3H2O). A mixture of CHCl3 (1.0 mL) and DMF (2.0 mL) in a glass vial (20 mL) was sonicated (33-40 KHz frequency) for 1.5 h in an ice bath. Subsequently, this solvent mixture was used immediately to dissolve AdDB (3.0 mg, 3.5 mmol). The solution of AdDB and 1.0 mL of the solution of the metal salt were mixed in a glass pressure tube (the final concentrations of AdDB and the metal salt were 0.9 mM and 1.8 mM, respectively). Then, the tube was sealed and heated for 48 h in an oven at 105 o C. Subsequently, the temperature of the controller was decreased every hour by 10°C. CSTAR-NO3 was isolated as a green powder by centrifugation, washed with ethanol and re-dispersed in 1.0 mL ethanol. CSTAR-SO4 appeared both as green crystals at the bottom of the tube and as a greenish powder.