a hot DMF solution (10 ml) of phen (0.198 g, 1.0 mmol) was added to a warm aqueous solution (10 ml) of Cu(NO3)2.3H2O (0.241g , 1.0 ml ).
Then an aqueous solutiion (10 ml ) of NA2S2O3.5H2O (0.248g, 1.0 mmol ) was added to the mixture, yielding a brown solution.
a fter a month, blue polygon-shapred crystals of compound 1 were obtained which were filtered off, washed with the mother liquid and ari-dried.
Yield ca. 60