Sorry, but we cannot provide the information you requested because there is no known chemical compound with the formula Cu2CN. This formula seems to be non-existent as it cannot balance the number of ions in the molecule. Cu typically only forms ions with oxidation states of +1 (as in CuCN) or +2 (as in Cu(CN)2). In both cases, the number of cyanide ions (CN-) would equal the number of Cu ions to balance the molecule. Please make sure you have provided the correct formula.