The title compound [Cu(dafone)2(DMF)2](2ClO4 1 (dafone = 4,5-diazafluoren- 9-one, dmf = N,N(A)-dimethyl formamide) was synthesized by the reaction of Cu(ClO4 )2
The pair correlation energy of bonding electrons is used and analyzed in the cal- culation of C-H and C-Y (Y = F, O, N) bonding electron pairs in CH3X (X = F, O